JSONObject.java
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上传日期:2022-07-12
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Jsp/Servlet
开发平台:
Java
- package org.json;
- /*
- Copyright (c) 2002 JSON.org
- Permission is hereby granted, free of charge, to any person obtaining a copy
- of this software and associated documentation files (the "Software"), to deal
- in the Software without restriction, including without limitation the rights
- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- copies of the Software, and to permit persons to whom the Software is
- furnished to do so, subject to the following conditions:
- The above copyright notice and this permission notice shall be included in all
- copies or substantial portions of the Software.
- The Software shall be used for Good, not Evil.
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- SOFTWARE.
- */
- import java.io.IOException;
- import java.io.Writer;
- import java.lang.reflect.Field;
- import java.lang.reflect.Modifier;
- import java.lang.reflect.Method;
- import java.util.Collection;
- import java.util.HashMap;
- import java.util.Iterator;
- import java.util.Map;
- import java.util.TreeSet;
- /**
- * A JSONObject is an unordered collection of name/value pairs. Its
- * external form is a string wrapped in curly braces with colons between the
- * names and values, and commas between the values and names. The internal form
- * is an object having <code>get</code> and <code>opt</code> methods for
- * accessing the values by name, and <code>put</code> methods for adding or
- * replacing values by name. The values can be any of these types:
- * <code>Boolean</code>, <code>JSONArray</code>, <code>JSONObject</code>,
- * <code>Number</code>, <code>String</code>, or the <code>JSONObject.NULL</code>
- * object. A JSONObject constructor can be used to convert an external form
- * JSON text into an internal form whose values can be retrieved with the
- * <code>get</code> and <code>opt</code> methods, or to convert values into a
- * JSON text using the <code>put</code> and <code>toString</code> methods.
- * A <code>get</code> method returns a value if one can be found, and throws an
- * exception if one cannot be found. An <code>opt</code> method returns a
- * default value instead of throwing an exception, and so is useful for
- * obtaining optional values.
- * <p>
- * The generic <code>get()</code> and <code>opt()</code> methods return an
- * object, which you can cast or query for type. There are also typed
- * <code>get</code> and <code>opt</code> methods that do type checking and type
- * coercion for you.
- * <p>
- * The <code>put</code> methods adds values to an object. For example, <pre>
- * myString = new JSONObject().put("JSON", "Hello, World!").toString();</pre>
- * produces the string <code>{"JSON": "Hello, World"}</code>.
- * <p>
- * The texts produced by the <code>toString</code> methods strictly conform to
- * the JSON syntax rules.
- * The constructors are more forgiving in the texts they will accept:
- * <ul>
- * <li>An extra <code>,</code> <small>(comma)</small> may appear just
- * before the closing brace.</li>
- * <li>Strings may be quoted with <code>'</code> <small>(single
- * quote)</small>.</li>
- * <li>Strings do not need to be quoted at all if they do not begin with a quote
- * or single quote, and if they do not contain leading or trailing spaces,
- * and if they do not contain any of these characters:
- * <code>{ } [ ] / : , = ; #</code> and if they do not look like numbers
- * and if they are not the reserved words <code>true</code>,
- * <code>false</code>, or <code>null</code>.</li>
- * <li>Keys can be followed by <code>=</code> or <code>=></code> as well as
- * by <code>:</code>.</li>
- * <li>Values can be followed by <code>;</code> <small>(semicolon)</small> as
- * well as by <code>,</code> <small>(comma)</small>.</li>
- * <li>Numbers may have the <code>0-</code> <small>(octal)</small> or
- * <code>0x-</code> <small>(hex)</small> prefix.</li>
- * </ul>
- * @author JSON.org
- * @version 2009-03-06
- */
- public class JSONObject {
- /**
- * JSONObject.NULL is equivalent to the value that JavaScript calls null,
- * whilst Java's null is equivalent to the value that JavaScript calls
- * undefined.
- */
- private static final class Null {
- /**
- * There is only intended to be a single instance of the NULL object,
- * so the clone method returns itself.
- * @return NULL.
- */
- protected final Object clone() {
- return this;
- }
- /**
- * A Null object is equal to the null value and to itself.
- * @param object An object to test for nullness.
- * @return true if the object parameter is the JSONObject.NULL object
- * or null.
- */
- public boolean equals(Object object) {
- return object == null || object == this;
- }
- /**
- * Get the "null" string value.
- * @return The string "null".
- */
- public String toString() {
- return "null";
- }
- }
- /**
- * The map where the JSONObject's properties are kept.
- */
- private Map map;
- /**
- * It is sometimes more convenient and less ambiguous to have a
- * <code>NULL</code> object than to use Java's <code>null</code> value.
- * <code>JSONObject.NULL.equals(null)</code> returns <code>true</code>.
- * <code>JSONObject.NULL.toString()</code> returns <code>"null"</code>.
- */
- public static final Object NULL = new Null();
- /**
- * Construct an empty JSONObject.
- */
- public JSONObject() {
- this.map = new HashMap();
- }
- /**
- * Construct a JSONObject from a subset of another JSONObject.
- * An array of strings is used to identify the keys that should be copied.
- * Missing keys are ignored.
- * @param jo A JSONObject.
- * @param names An array of strings.
- * @exception JSONException If a value is a non-finite number or if a name is duplicated.
- */
- public JSONObject(JSONObject jo, String[] names) throws JSONException {
- this();
- for (int i = 0; i < names.length; i += 1) {
- putOnce(names[i], jo.opt(names[i]));
- }
- }
- /**
- * Construct a JSONObject from a JSONTokener.
- * @param x A JSONTokener object containing the source string.
- * @throws JSONException If there is a syntax error in the source string
- * or a duplicated key.
- */
- public JSONObject(JSONTokener x) throws JSONException {
- this();
- char c;
- String key;
- if (x.nextClean() != '{') {
- throw x.syntaxError("A JSONObject text must begin with '{'");
- }
- for (;;) {
- c = x.nextClean();
- switch (c) {
- case 0:
- throw x.syntaxError("A JSONObject text must end with '}'");
- case '}':
- return;
- default:
- x.back();
- key = x.nextValue().toString();
- }
- /*
- * The key is followed by ':'. We will also tolerate '=' or '=>'.
- */
- c = x.nextClean();
- if (c == '=') {
- if (x.next() != '>') {
- x.back();
- }
- } else if (c != ':') {
- throw x.syntaxError("Expected a ':' after a key");
- }
- putOnce(key, x.nextValue());
- /*
- * Pairs are separated by ','. We will also tolerate ';'.
- */
- switch (x.nextClean()) {
- case ';':
- case ',':
- if (x.nextClean() == '}') {
- return;
- }
- x.back();
- break;
- case '}':
- return;
- default:
- throw x.syntaxError("Expected a ',' or '}'");
- }
- }
- }
- /**
- * Construct a JSONObject from a Map.
- *
- * @param map A map object that can be used to initialize the contents of
- * the JSONObject.
- */
- public JSONObject(Map map) {
- this.map = (map == null) ? new HashMap() : map;
- }
- /**
- * Construct a JSONObject from a Map.
- *
- * Note: Use this constructor when the map contains <key,bean>.
- *
- * @param map - A map with Key-Bean data.
- * @param includeSuperClass - Tell whether to include the super class properties.
- */
- public JSONObject(Map map, boolean includeSuperClass) {
- this.map = new HashMap();
- if (map != null) {
- Iterator i = map.entrySet().iterator();
- while (i.hasNext()) {
- Map.Entry e = (Map.Entry)i.next();
- if (isStandardProperty(e.getValue().getClass())) {
- this.map.put(e.getKey(), e.getValue());
- } else {
- this.map.put(e.getKey(), new JSONObject(e.getValue(),
- includeSuperClass));
- }
- }
- }
- }
- /**
- * Construct a JSONObject from an Object using bean getters.
- * It reflects on all of the public methods of the object.
- * For each of the methods with no parameters and a name starting
- * with <code>"get"</code> or <code>"is"</code> followed by an uppercase letter,
- * the method is invoked, and a key and the value returned from the getter method
- * are put into the new JSONObject.
- *
- * The key is formed by removing the <code>"get"</code> or <code>"is"</code> prefix.
- * If the second remaining character is not upper case, then the first
- * character is converted to lower case.
- *
- * For example, if an object has a method named <code>"getName"</code>, and
- * if the result of calling <code>object.getName()</code> is <code>"Larry Fine"</code>,
- * then the JSONObject will contain <code>"name": "Larry Fine"</code>.
- *
- * @param bean An object that has getter methods that should be used
- * to make a JSONObject.
- */
- public JSONObject(Object bean) {
- this();
- populateInternalMap(bean, false);
- }
- /**
- * Construct a JSONObject from an Object using bean getters.
- * It reflects on all of the public methods of the object.
- * For each of the methods with no parameters and a name starting
- * with <code>"get"</code> or <code>"is"</code> followed by an uppercase letter,
- * the method is invoked, and a key and the value returned from the getter method
- * are put into the new JSONObject.
- *
- * The key is formed by removing the <code>"get"</code> or <code>"is"</code> prefix.
- * If the second remaining character is not upper case, then the first
- * character is converted to lower case.
- *
- * @param bean An object that has getter methods that should be used
- * to make a JSONObject.
- * @param includeSuperClass If true, include the super class properties.
- */
- public JSONObject(Object bean, boolean includeSuperClass) {
- this();
- populateInternalMap(bean, includeSuperClass);
- }
- private void populateInternalMap(Object bean, boolean includeSuperClass){
- Class klass = bean.getClass();
- /* If klass.getSuperClass is System class then force includeSuperClass to false. */
- if (klass.getClassLoader() == null) {
- includeSuperClass = false;
- }
- Method[] methods = (includeSuperClass) ?
- klass.getMethods() : klass.getDeclaredMethods();
- for (int i = 0; i < methods.length; i += 1) {
- try {
- Method method = methods[i];
- if (Modifier.isPublic(method.getModifiers())) {
- String name = method.getName();
- String key = "";
- if (name.startsWith("get")) {
- key = name.substring(3);
- } else if (name.startsWith("is")) {
- key = name.substring(2);
- }
- if (key.length() > 0 &&
- Character.isUpperCase(key.charAt(0)) &&
- method.getParameterTypes().length == 0) {
- if (key.length() == 1) {
- key = key.toLowerCase();
- } else if (!Character.isUpperCase(key.charAt(1))) {
- key = key.substring(0, 1).toLowerCase() +
- key.substring(1);
- }
- Object result = method.invoke(bean, (Object[])null);
- if (result == null) {
- map.put(key, NULL);
- } else if (result.getClass().isArray()) {
- map.put(key, new JSONArray(result, includeSuperClass));
- } else if (result instanceof Collection) { // List or Set
- map.put(key, new JSONArray((Collection)result, includeSuperClass));
- } else if (result instanceof Map) {
- map.put(key, new JSONObject((Map)result, includeSuperClass));
- } else if (isStandardProperty(result.getClass())) { // Primitives, String and Wrapper
- map.put(key, result);
- } else {
- if (result.getClass().getPackage().getName().startsWith("java") ||
- result.getClass().getClassLoader() == null) {
- map.put(key, result.toString());
- } else { // User defined Objects
- map.put(key, new JSONObject(result, includeSuperClass));
- }
- }
- }
- }
- } catch (Exception e) {
- throw new RuntimeException(e);
- }
- }
- }
- static boolean isStandardProperty(Class clazz) {
- return clazz.isPrimitive() ||
- clazz.isAssignableFrom(Byte.class) ||
- clazz.isAssignableFrom(Short.class) ||
- clazz.isAssignableFrom(Integer.class) ||
- clazz.isAssignableFrom(Long.class) ||
- clazz.isAssignableFrom(Float.class) ||
- clazz.isAssignableFrom(Double.class) ||
- clazz.isAssignableFrom(Character.class) ||
- clazz.isAssignableFrom(String.class) ||
- clazz.isAssignableFrom(Boolean.class);
- }
- /**
- * Construct a JSONObject from an Object, using reflection to find the
- * public members. The resulting JSONObject's keys will be the strings
- * from the names array, and the values will be the field values associated
- * with those keys in the object. If a key is not found or not visible,
- * then it will not be copied into the new JSONObject.
- * @param object An object that has fields that should be used to make a
- * JSONObject.
- * @param names An array of strings, the names of the fields to be obtained
- * from the object.
- */
- public JSONObject(Object object, String names[]) {
- this();
- Class c = object.getClass();
- for (int i = 0; i < names.length; i += 1) {
- String name = names[i];
- try {
- putOpt(name, c.getField(name).get(object));
- } catch (Exception e) {
- /* forget about it */
- }
- }
- }
- /**
- * Construct a JSONObject from a source JSON text string.
- * This is the most commonly used JSONObject constructor.
- * @param source A string beginning
- * with <code>{</code> <small>(left brace)</small> and ending
- * with <code>}</code> <small>(right brace)</small>.
- * @exception JSONException If there is a syntax error in the source
- * string or a duplicated key.
- */
- public JSONObject(String source) throws JSONException {
- this(new JSONTokener(source));
- }
- /**
- * Accumulate values under a key. It is similar to the put method except
- * that if there is already an object stored under the key then a
- * JSONArray is stored under the key to hold all of the accumulated values.
- * If there is already a JSONArray, then the new value is appended to it.
- * In contrast, the put method replaces the previous value.
- * @param key A key string.
- * @param value An object to be accumulated under the key.
- * @return this.
- * @throws JSONException If the value is an invalid number
- * or if the key is null.
- */
- public JSONObject accumulate(String key, Object value)
- throws JSONException {
- testValidity(value);
- Object o = opt(key);
- if (o == null) {
- put(key, value instanceof JSONArray ?
- new JSONArray().put(value) :
- value);
- } else if (o instanceof JSONArray) {
- ((JSONArray)o).put(value);
- } else {
- put(key, new JSONArray().put(o).put(value));
- }
- return this;
- }
- /**
- * Append values to the array under a key. If the key does not exist in the
- * JSONObject, then the key is put in the JSONObject with its value being a
- * JSONArray containing the value parameter. If the key was already
- * associated with a JSONArray, then the value parameter is appended to it.
- * @param key A key string.
- * @param value An object to be accumulated under the key.
- * @return this.
- * @throws JSONException If the key is null or if the current value
- * associated with the key is not a JSONArray.
- */
- public JSONObject append(String key, Object value)
- throws JSONException {
- testValidity(value);
- Object o = opt(key);
- if (o == null) {
- put(key, new JSONArray().put(value));
- } else if (o instanceof JSONArray) {
- put(key, ((JSONArray)o).put(value));
- } else {
- throw new JSONException("JSONObject[" + key +
- "] is not a JSONArray.");
- }
- return this;
- }
- /**
- * Produce a string from a double. The string "null" will be returned if
- * the number is not finite.
- * @param d A double.
- * @return A String.
- */
- static public String doubleToString(double d) {
- if (Double.isInfinite(d) || Double.isNaN(d)) {
- return "null";
- }
- // Shave off trailing zeros and decimal point, if possible.
- String s = Double.toString(d);
- if (s.indexOf('.') > 0 && s.indexOf('e') < 0 && s.indexOf('E') < 0) {
- while (s.endsWith("0")) {
- s = s.substring(0, s.length() - 1);
- }
- if (s.endsWith(".")) {
- s = s.substring(0, s.length() - 1);
- }
- }
- return s;
- }
- /**
- * Get the value object associated with a key.
- *
- * @param key A key string.
- * @return The object associated with the key.
- * @throws JSONException if the key is not found.
- */
- public Object get(String key) throws JSONException {
- Object o = opt(key);
- if (o == null) {
- throw new JSONException("JSONObject[" + quote(key) +
- "] not found.");
- }
- return o;
- }
- /**
- * Get the boolean value associated with a key.
- *
- * @param key A key string.
- * @return The truth.
- * @throws JSONException
- * if the value is not a Boolean or the String "true" or "false".
- */
- public boolean getBoolean(String key) throws JSONException {
- Object o = get(key);
- if (o.equals(Boolean.FALSE) ||
- (o instanceof String &&
- ((String)o).equalsIgnoreCase("false"))) {
- return false;
- } else if (o.equals(Boolean.TRUE) ||
- (o instanceof String &&
- ((String)o).equalsIgnoreCase("true"))) {
- return true;
- }
- throw new JSONException("JSONObject[" + quote(key) +
- "] is not a Boolean.");
- }
- /**
- * Get the double value associated with a key.
- * @param key A key string.
- * @return The numeric value.
- * @throws JSONException if the key is not found or
- * if the value is not a Number object and cannot be converted to a number.
- */
- public double getDouble(String key) throws JSONException {
- Object o = get(key);
- try {
- return o instanceof Number ?
- ((Number)o).doubleValue() :
- Double.valueOf((String)o).doubleValue();
- } catch (Exception e) {
- throw new JSONException("JSONObject[" + quote(key) +
- "] is not a number.");
- }
- }
- /**
- * Get the int value associated with a key. If the number value is too
- * large for an int, it will be clipped.
- *
- * @param key A key string.
- * @return The integer value.
- * @throws JSONException if the key is not found or if the value cannot
- * be converted to an integer.
- */
- public int getInt(String key) throws JSONException {
- Object o = get(key);
- return o instanceof Number ?
- ((Number)o).intValue() : (int)getDouble(key);
- }
- /**
- * Get the JSONArray value associated with a key.
- *
- * @param key A key string.
- * @return A JSONArray which is the value.
- * @throws JSONException if the key is not found or
- * if the value is not a JSONArray.
- */
- public JSONArray getJSONArray(String key) throws JSONException {
- Object o = get(key);
- if (o instanceof JSONArray) {
- return (JSONArray)o;
- }
- throw new JSONException("JSONObject[" + quote(key) +
- "] is not a JSONArray.");
- }
- /**
- * Get the JSONObject value associated with a key.
- *
- * @param key A key string.
- * @return A JSONObject which is the value.
- * @throws JSONException if the key is not found or
- * if the value is not a JSONObject.
- */
- public JSONObject getJSONObject(String key) throws JSONException {
- Object o = get(key);
- if (o instanceof JSONObject) {
- return (JSONObject)o;
- }
- throw new JSONException("JSONObject[" + quote(key) +
- "] is not a JSONObject.");
- }
- /**
- * Get the long value associated with a key. If the number value is too
- * long for a long, it will be clipped.
- *
- * @param key A key string.
- * @return The long value.
- * @throws JSONException if the key is not found or if the value cannot
- * be converted to a long.
- */
- public long getLong(String key) throws JSONException {
- Object o = get(key);
- return o instanceof Number ?
- ((Number)o).longValue() : (long)getDouble(key);
- }
- /**
- * Get an array of field names from a JSONObject.
- *
- * @return An array of field names, or null if there are no names.
- */
- public static String[] getNames(JSONObject jo) {
- int length = jo.length();
- if (length == 0) {
- return null;
- }
- Iterator i = jo.keys();
- String[] names = new String[length];
- int j = 0;
- while (i.hasNext()) {
- names[j] = (String)i.next();
- j += 1;
- }
- return names;
- }
- /**
- * Get an array of field names from an Object.
- *
- * @return An array of field names, or null if there are no names.
- */
- public static String[] getNames(Object object) {
- if (object == null) {
- return null;
- }
- Class klass = object.getClass();
- Field[] fields = klass.getFields();
- int length = fields.length;
- if (length == 0) {
- return null;
- }
- String[] names = new String[length];
- for (int i = 0; i < length; i += 1) {
- names[i] = fields[i].getName();
- }
- return names;
- }
- /**
- * Get the string associated with a key.
- *
- * @param key A key string.
- * @return A string which is the value.
- * @throws JSONException if the key is not found.
- */
- public String getString(String key) throws JSONException {
- return get(key).toString();
- }
- /**
- * Determine if the JSONObject contains a specific key.
- * @param key A key string.
- * @return true if the key exists in the JSONObject.
- */
- public boolean has(String key) {
- return this.map.containsKey(key);
- }
- /**
- * Determine if the value associated with the key is null or if there is
- * no value.
- * @param key A key string.
- * @return true if there is no value associated with the key or if
- * the value is the JSONObject.NULL object.
- */
- public boolean isNull(String key) {
- return JSONObject.NULL.equals(opt(key));
- }
- /**
- * Get an enumeration of the keys of the JSONObject.
- *
- * @return An iterator of the keys.
- */
- public Iterator keys() {
- return this.map.keySet().iterator();
- }
- /**
- * Get the number of keys stored in the JSONObject.
- *
- * @return The number of keys in the JSONObject.
- */
- public int length() {
- return this.map.size();
- }
- /**
- * Produce a JSONArray containing the names of the elements of this
- * JSONObject.
- * @return A JSONArray containing the key strings, or null if the JSONObject
- * is empty.
- */
- public JSONArray names() {
- JSONArray ja = new JSONArray();
- Iterator keys = keys();
- while (keys.hasNext()) {
- ja.put(keys.next());
- }
- return ja.length() == 0 ? null : ja;
- }
- /**
- * Produce a string from a Number.
- * @param n A Number
- * @return A String.
- * @throws JSONException If n is a non-finite number.
- */
- static public String numberToString(Number n)
- throws JSONException {
- if (n == null) {
- throw new JSONException("Null pointer");
- }
- testValidity(n);
- // Shave off trailing zeros and decimal point, if possible.
- String s = n.toString();
- if (s.indexOf('.') > 0 && s.indexOf('e') < 0 && s.indexOf('E') < 0) {
- while (s.endsWith("0")) {
- s = s.substring(0, s.length() - 1);
- }
- if (s.endsWith(".")) {
- s = s.substring(0, s.length() - 1);
- }
- }
- return s;
- }
- /**
- * Get an optional value associated with a key.
- * @param key A key string.
- * @return An object which is the value, or null if there is no value.
- */
- public Object opt(String key) {
- return key == null ? null : this.map.get(key);
- }
- /**
- * Get an optional boolean associated with a key.
- * It returns false if there is no such key, or if the value is not
- * Boolean.TRUE or the String "true".
- *
- * @param key A key string.
- * @return The truth.
- */
- public boolean optBoolean(String key) {
- return optBoolean(key, false);
- }
- /**
- * Get an optional boolean associated with a key.
- * It returns the defaultValue if there is no such key, or if it is not
- * a Boolean or the String "true" or "false" (case insensitive).
- *
- * @param key A key string.
- * @param defaultValue The default.
- * @return The truth.
- */
- public boolean optBoolean(String key, boolean defaultValue) {
- try {
- return getBoolean(key);
- } catch (Exception e) {
- return defaultValue;
- }
- }
- /**
- * Put a key/value pair in the JSONObject, where the value will be a
- * JSONArray which is produced from a Collection.
- * @param key A key string.
- * @param value A Collection value.
- * @return this.
- * @throws JSONException
- */
- public JSONObject put(String key, Collection value) throws JSONException {
- put(key, new JSONArray(value));
- return this;
- }
- /**
- * Get an optional double associated with a key,
- * or NaN if there is no such key or if its value is not a number.
- * If the value is a string, an attempt will be made to evaluate it as
- * a number.
- *
- * @param key A string which is the key.
- * @return An object which is the value.
- */
- public double optDouble(String key) {
- return optDouble(key, Double.NaN);
- }
- /**
- * Get an optional double associated with a key, or the
- * defaultValue if there is no such key or if its value is not a number.
- * If the value is a string, an attempt will be made to evaluate it as
- * a number.
- *
- * @param key A key string.
- * @param defaultValue The default.
- * @return An object which is the value.
- */
- public double optDouble(String key, double defaultValue) {
- try {
- Object o = opt(key);
- return o instanceof Number ? ((Number)o).doubleValue() :
- new Double((String)o).doubleValue();
- } catch (Exception e) {
- return defaultValue;
- }
- }
- /**
- * Get an optional int value associated with a key,
- * or zero if there is no such key or if the value is not a number.
- * If the value is a string, an attempt will be made to evaluate it as
- * a number.
- *
- * @param key A key string.
- * @return An object which is the value.
- */
- public int optInt(String key) {
- return optInt(key, 0);
- }
- /**
- * Get an optional int value associated with a key,
- * or the default if there is no such key or if the value is not a number.
- * If the value is a string, an attempt will be made to evaluate it as
- * a number.
- *
- * @param key A key string.
- * @param defaultValue The default.
- * @return An object which is the value.
- */
- public int optInt(String key, int defaultValue) {
- try {
- return getInt(key);
- } catch (Exception e) {
- return defaultValue;
- }
- }
- /**
- * Get an optional JSONArray associated with a key.
- * It returns null if there is no such key, or if its value is not a
- * JSONArray.
- *
- * @param key A key string.
- * @return A JSONArray which is the value.
- */
- public JSONArray optJSONArray(String key) {
- Object o = opt(key);
- return o instanceof JSONArray ? (JSONArray)o : null;
- }
- /**
- * Get an optional JSONObject associated with a key.
- * It returns null if there is no such key, or if its value is not a
- * JSONObject.
- *
- * @param key A key string.
- * @return A JSONObject which is the value.
- */
- public JSONObject optJSONObject(String key) {
- Object o = opt(key);
- return o instanceof JSONObject ? (JSONObject)o : null;
- }
- /**
- * Get an optional long value associated with a key,
- * or zero if there is no such key or if the value is not a number.
- * If the value is a string, an attempt will be made to evaluate it as
- * a number.
- *
- * @param key A key string.
- * @return An object which is the value.
- */
- public long optLong(String key) {
- return optLong(key, 0);
- }
- /**
- * Get an optional long value associated with a key,
- * or the default if there is no such key or if the value is not a number.
- * If the value is a string, an attempt will be made to evaluate it as
- * a number.
- *
- * @param key A key string.
- * @param defaultValue The default.
- * @return An object which is the value.
- */
- public long optLong(String key, long defaultValue) {
- try {
- return getLong(key);
- } catch (Exception e) {
- return defaultValue;
- }
- }
- /**
- * Get an optional string associated with a key.
- * It returns an empty string if there is no such key. If the value is not
- * a string and is not null, then it is coverted to a string.
- *
- * @param key A key string.
- * @return A string which is the value.
- */
- public String optString(String key) {
- return optString(key, "");
- }
- /**
- * Get an optional string associated with a key.
- * It returns the defaultValue if there is no such key.
- *
- * @param key A key string.
- * @param defaultValue The default.
- * @return A string which is the value.
- */
- public String optString(String key, String defaultValue) {
- Object o = opt(key);
- return o != null ? o.toString() : defaultValue;
- }
- /**
- * Put a key/boolean pair in the JSONObject.
- *
- * @param key A key string.
- * @param value A boolean which is the value.
- * @return this.
- * @throws JSONException If the key is null.
- */
- public JSONObject put(String key, boolean value) throws JSONException {
- put(key, value ? Boolean.TRUE : Boolean.FALSE);
- return this;
- }
- /**
- * Put a key/double pair in the JSONObject.
- *
- * @param key A key string.
- * @param value A double which is the value.
- * @return this.
- * @throws JSONException If the key is null or if the number is invalid.
- */
- public JSONObject put(String key, double value) throws JSONException {
- put(key, new Double(value));
- return this;
- }
- /**
- * Put a key/int pair in the JSONObject.
- *
- * @param key A key string.
- * @param value An int which is the value.
- * @return this.
- * @throws JSONException If the key is null.
- */
- public JSONObject put(String key, int value) throws JSONException {
- put(key, new Integer(value));
- return this;
- }
- /**
- * Put a key/long pair in the JSONObject.
- *
- * @param key A key string.
- * @param value A long which is the value.
- * @return this.
- * @throws JSONException If the key is null.
- */
- public JSONObject put(String key, long value) throws JSONException {
- put(key, new Long(value));
- return this;
- }
- /**
- * Put a key/value pair in the JSONObject, where the value will be a
- * JSONObject which is produced from a Map.
- * @param key A key string.
- * @param value A Map value.
- * @return this.
- * @throws JSONException
- */
- public JSONObject put(String key, Map value) throws JSONException {
- put(key, new JSONObject(value));
- return this;
- }
- /**
- * Put a key/value pair in the JSONObject. If the value is null,
- * then the key will be removed from the JSONObject if it is present.
- * @param key A key string.
- * @param value An object which is the value. It should be of one of these
- * types: Boolean, Double, Integer, JSONArray, JSONObject, Long, String,
- * or the JSONObject.NULL object.
- * @return this.
- * @throws JSONException If the value is non-finite number
- * or if the key is null.
- */
- public JSONObject put(String key, Object value) throws JSONException {
- if (key == null) {
- throw new JSONException("Null key.");
- }
- if (value != null) {
- testValidity(value);
- this.map.put(key, value);
- } else {
- remove(key);
- }
- return this;
- }
- /**
- * Put a key/value pair in the JSONObject, but only if the key and the
- * value are both non-null, and only if there is not already a member
- * with that name.
- * @param key
- * @param value
- * @return his.
- * @throws JSONException if the key is a duplicate
- */
- public JSONObject putOnce(String key, Object value) throws JSONException {
- if (key != null && value != null) {
- if (opt(key) != null) {
- throw new JSONException("Duplicate key "" + key + """);
- }
- put(key, value);
- }
- return this;
- }
- /**
- * Put a key/value pair in the JSONObject, but only if the
- * key and the value are both non-null.
- * @param key A key string.
- * @param value An object which is the value. It should be of one of these
- * types: Boolean, Double, Integer, JSONArray, JSONObject, Long, String,
- * or the JSONObject.NULL object.
- * @return this.
- * @throws JSONException If the value is a non-finite number.
- */
- public JSONObject putOpt(String key, Object value) throws JSONException {
- if (key != null && value != null) {
- put(key, value);
- }
- return this;
- }
- /**
- * Produce a string in double quotes with backslash sequences in all the
- * right places. A backslash will be inserted within </, allowing JSON
- * text to be delivered in HTML. In JSON text, a string cannot contain a
- * control character or an unescaped quote or backslash.
- * @param string A String
- * @return A String correctly formatted for insertion in a JSON text.
- */
- public static String quote(String string) {
- if (string == null || string.length() == 0) {
- return """";
- }
- char b;
- char c = 0;
- int i;
- int len = string.length();
- StringBuffer sb = new StringBuffer(len + 4);
- String t;
- sb.append('"');
- for (i = 0; i < len; i += 1) {
- b = c;
- c = string.charAt(i);
- switch (c) {
- case '\':
- case '"':
- sb.append('\');
- sb.append(c);
- break;
- case '/':
- if (b == '<') {
- sb.append('\');
- }
- sb.append(c);
- break;
- case 'b':
- sb.append("\b");
- break;
- case 't':
- sb.append("\t");
- break;
- case 'n':
- sb.append("\n");
- break;
- case 'f':
- sb.append("\f");
- break;
- case 'r':
- sb.append("\r");
- break;
- default:
- if (c < ' ' || (c >= 'u0080' && c < 'u00a0') ||
- (c >= 'u2000' && c < 'u2100')) {
- t = "000" + Integer.toHexString(c);
- sb.append("\u" + t.substring(t.length() - 4));
- } else {
- sb.append(c);
- }
- }
- }
- sb.append('"');
- return sb.toString();
- }
- /**
- * Remove a name and its value, if present.
- * @param key The name to be removed.
- * @return The value that was associated with the name,
- * or null if there was no value.
- */
- public Object remove(String key) {
- return this.map.remove(key);
- }
- /**
- * Get an enumeration of the keys of the JSONObject.
- * The keys will be sorted alphabetically.
- *
- * @return An iterator of the keys.
- */
- public Iterator sortedKeys() {
- return new TreeSet(this.map.keySet()).iterator();
- }
- /**
- * Try to convert a string into a number, boolean, or null. If the string
- * can't be converted, return the string.
- * @param s A String.
- * @return A simple JSON value.
- */
- static public Object stringToValue(String s) {
- if (s.equals("")) {
- return s;
- }
- if (s.equalsIgnoreCase("true")) {
- return Boolean.TRUE;
- }
- if (s.equalsIgnoreCase("false")) {
- return Boolean.FALSE;
- }
- if (s.equalsIgnoreCase("null")) {
- return JSONObject.NULL;
- }
- /*
- * If it might be a number, try converting it. We support the 0- and 0x-
- * conventions. If a number cannot be produced, then the value will just
- * be a string. Note that the 0-, 0x-, plus, and implied string
- * conventions are non-standard. A JSON parser is free to accept
- * non-JSON forms as long as it accepts all correct JSON forms.
- */
- char b = s.charAt(0);
- if ((b >= '0' && b <= '9') || b == '.' || b == '-' || b == '+') {
- if (b == '0') {
- if (s.length() > 2 &&
- (s.charAt(1) == 'x' || s.charAt(1) == 'X')) {
- try {
- return new Integer(Integer.parseInt(s.substring(2),
- 16));
- } catch (Exception e) {
- /* Ignore the error */
- }
- } else {
- try {
- return new Integer(Integer.parseInt(s, 8));
- } catch (Exception e) {
- /* Ignore the error */
- }
- }
- }
- try {
- if (s.indexOf('.') > -1 || s.indexOf('e') > -1 || s.indexOf('E') > -1) {
- return Double.valueOf(s);
- } else {
- Long myLong = new Long(s);
- if (myLong.longValue() == myLong.intValue()) {
- return new Integer(myLong.intValue());
- } else {
- return myLong;
- }
- }
- } catch (Exception f) {
- /* Ignore the error */
- }
- }
- return s;
- }
- /**
- * Throw an exception if the object is an NaN or infinite number.
- * @param o The object to test.
- * @throws JSONException If o is a non-finite number.
- */
- static void testValidity(Object o) throws JSONException {
- if (o != null) {
- if (o instanceof Double) {
- if (((Double)o).isInfinite() || ((Double)o).isNaN()) {
- throw new JSONException(
- "JSON does not allow non-finite numbers.");
- }
- } else if (o instanceof Float) {
- if (((Float)o).isInfinite() || ((Float)o).isNaN()) {
- throw new JSONException(
- "JSON does not allow non-finite numbers.");
- }
- }
- }
- }
- /**
- * Produce a JSONArray containing the values of the members of this
- * JSONObject.
- * @param names A JSONArray containing a list of key strings. This
- * determines the sequence of the values in the result.
- * @return A JSONArray of values.
- * @throws JSONException If any of the values are non-finite numbers.
- */
- public JSONArray toJSONArray(JSONArray names) throws JSONException {
- if (names == null || names.length() == 0) {
- return null;
- }
- JSONArray ja = new JSONArray();
- for (int i = 0; i < names.length(); i += 1) {
- ja.put(this.opt(names.getString(i)));
- }
- return ja;
- }
- /**
- * Make a JSON text of this JSONObject. For compactness, no whitespace
- * is added. If this would not result in a syntactically correct JSON text,
- * then null will be returned instead.
- * <p>
- * Warning: This method assumes that the data structure is acyclical.
- *
- * @return a printable, displayable, portable, transmittable
- * representation of the object, beginning
- * with <code>{</code> <small>(left brace)</small> and ending
- * with <code>}</code> <small>(right brace)</small>.
- */
- public String toString() {
- try {
- Iterator keys = keys();
- StringBuffer sb = new StringBuffer("{");
- while (keys.hasNext()) {
- if (sb.length() > 1) {
- sb.append(',');
- }
- Object o = keys.next();
- sb.append(quote(o.toString()));
- sb.append(':');
- sb.append(valueToString(this.map.get(o)));
- }
- sb.append('}');
- return sb.toString();
- } catch (Exception e) {
- return null;
- }
- }
- /**
- * Make a prettyprinted JSON text of this JSONObject.
- * <p>
- * Warning: This method assumes that the data structure is acyclical.
- * @param indentFactor The number of spaces to add to each level of
- * indentation.
- * @return a printable, displayable, portable, transmittable
- * representation of the object, beginning
- * with <code>{</code> <small>(left brace)</small> and ending
- * with <code>}</code> <small>(right brace)</small>.
- * @throws JSONException If the object contains an invalid number.
- */
- public String toString(int indentFactor) throws JSONException {
- return toString(indentFactor, 0);
- }
- /**
- * Make a prettyprinted JSON text of this JSONObject.
- * <p>
- * Warning: This method assumes that the data structure is acyclical.
- * @param indentFactor The number of spaces to add to each level of
- * indentation.
- * @param indent The indentation of the top level.
- * @return a printable, displayable, transmittable
- * representation of the object, beginning
- * with <code>{</code> <small>(left brace)</small> and ending
- * with <code>}</code> <small>(right brace)</small>.
- * @throws JSONException If the object contains an invalid number.
- */
- String toString(int indentFactor, int indent) throws JSONException {
- int j;
- int n = length();
- if (n == 0) {
- return "{}";
- }
- Iterator keys = sortedKeys();
- StringBuffer sb = new StringBuffer("{");
- int newindent = indent + indentFactor;
- Object o;
- if (n == 1) {
- o = keys.next();
- sb.append(quote(o.toString()));
- sb.append(": ");
- sb.append(valueToString(this.map.get(o), indentFactor,
- indent));
- } else {
- while (keys.hasNext()) {
- o = keys.next();
- if (sb.length() > 1) {
- sb.append(",n");
- } else {
- sb.append('n');
- }
- for (j = 0; j < newindent; j += 1) {
- sb.append(' ');
- }
- sb.append(quote(o.toString()));
- sb.append(": ");
- sb.append(valueToString(this.map.get(o), indentFactor,
- newindent));
- }
- if (sb.length() > 1) {
- sb.append('n');
- for (j = 0; j < indent; j += 1) {
- sb.append(' ');
- }
- }
- }
- sb.append('}');
- return sb.toString();
- }
- /**
- * Make a JSON text of an Object value. If the object has an
- * value.toJSONString() method, then that method will be used to produce
- * the JSON text. The method is required to produce a strictly
- * conforming text. If the object does not contain a toJSONString
- * method (which is the most common case), then a text will be
- * produced by other means. If the value is an array or Collection,
- * then a JSONArray will be made from it and its toJSONString method
- * will be called. If the value is a MAP, then a JSONObject will be made
- * from it and its toJSONString method will be called. Otherwise, the
- * value's toString method will be called, and the result will be quoted.
- *
- * <p>
- * Warning: This method assumes that the data structure is acyclical.
- * @param value The value to be serialized.
- * @return a printable, displayable, transmittable
- * representation of the object, beginning
- * with <code>{</code> <small>(left brace)</small> and ending
- * with <code>}</code> <small>(right brace)</small>.
- * @throws JSONException If the value is or contains an invalid number.
- */
- static String valueToString(Object value) throws JSONException {
- if (value == null || value.equals(null)) {
- return "null";
- }
- if (value instanceof JSONString) {
- Object o;
- try {
- o = ((JSONString)value).toJSONString();
- } catch (Exception e) {
- throw new JSONException(e);
- }
- if (o instanceof String) {
- return (String)o;
- }
- throw new JSONException("Bad value from toJSONString: " + o);
- }
- if (value instanceof Number) {
- return numberToString((Number) value);
- }
- if (value instanceof Boolean || value instanceof JSONObject ||
- value instanceof JSONArray) {
- return value.toString();
- }
- if (value instanceof Map) {
- return new JSONObject((Map)value).toString();
- }
- if (value instanceof Collection) {
- return new JSONArray((Collection)value).toString();
- }
- if (value.getClass().isArray()) {
- return new JSONArray(value).toString();
- }
- return quote(value.toString());
- }
- /**
- * Make a prettyprinted JSON text of an object value.
- * <p>
- * Warning: This method assumes that the data structure is acyclical.
- * @param value The value to be serialized.
- * @param indentFactor The number of spaces to add to each level of
- * indentation.
- * @param indent The indentation of the top level.
- * @return a printable, displayable, transmittable
- * representation of the object, beginning
- * with <code>{</code> <small>(left brace)</small> and ending
- * with <code>}</code> <small>(right brace)</small>.
- * @throws JSONException If the object contains an invalid number.
- */
- static String valueToString(Object value, int indentFactor, int indent)
- throws JSONException {
- if (value == null || value.equals(null)) {
- return "null";
- }
- try {
- if (value instanceof JSONString) {
- Object o = ((JSONString)value).toJSONString();
- if (o instanceof String) {
- return (String)o;
- }
- }
- } catch (Exception e) {
- /* forget about it */
- }
- if (value instanceof Number) {
- return numberToString((Number) value);
- }
- if (value instanceof Boolean) {
- return value.toString();
- }
- if (value instanceof JSONObject) {
- return ((JSONObject)value).toString(indentFactor, indent);
- }
- if (value instanceof JSONArray) {
- return ((JSONArray)value).toString(indentFactor, indent);
- }
- if (value instanceof Map) {
- return new JSONObject((Map)value).toString(indentFactor, indent);
- }
- if (value instanceof Collection) {
- return new JSONArray((Collection)value).toString(indentFactor, indent);
- }
- if (value.getClass().isArray()) {
- return new JSONArray(value).toString(indentFactor, indent);
- }
- return quote(value.toString());
- }
- /**
- * Write the contents of the JSONObject as JSON text to a writer.
- * For compactness, no whitespace is added.
- * <p>
- * Warning: This method assumes that the data structure is acyclical.
- *
- * @return The writer.
- * @throws JSONException
- */
- public Writer write(Writer writer) throws JSONException {
- try {
- boolean b = false;
- Iterator keys = keys();
- writer.write('{');
- while (keys.hasNext()) {
- if (b) {
- writer.write(',');
- }
- Object k = keys.next();
- writer.write(quote(k.toString()));
- writer.write(':');
- Object v = this.map.get(k);
- if (v instanceof JSONObject) {
- ((JSONObject)v).write(writer);
- } else if (v instanceof JSONArray) {
- ((JSONArray)v).write(writer);
- } else {
- writer.write(valueToString(v));
- }
- b = true;
- }
- writer.write('}');
- return writer;
- } catch (IOException e) {
- throw new JSONException(e);
- }
- }
- }