XmlRecordOutput.java
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上传日期:2018-01-08
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文件大小:7k
- /**
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements. See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership. The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- package org.apache.hadoop.record;
- import java.io.IOException;
- import java.util.TreeMap;
- import java.util.ArrayList;
- import java.io.PrintStream;
- import java.io.OutputStream;
- import java.io.UnsupportedEncodingException;
- import java.util.Stack;
- /**
- * XML Serializer.
- */
- public class XmlRecordOutput implements RecordOutput {
- private PrintStream stream;
-
- private int indent = 0;
-
- private Stack<String> compoundStack;
-
- private void putIndent() {
- StringBuffer sb = new StringBuffer("");
- for (int idx = 0; idx < indent; idx++) {
- sb.append(" ");
- }
- stream.print(sb.toString());
- }
-
- private void addIndent() {
- indent++;
- }
-
- private void closeIndent() {
- indent--;
- }
-
- private void printBeginEnvelope(String tag) {
- if (!compoundStack.empty()) {
- String s = compoundStack.peek();
- if ("struct".equals(s)) {
- putIndent();
- stream.print("<member>n");
- addIndent();
- putIndent();
- stream.print("<name>"+tag+"</name>n");
- putIndent();
- stream.print("<value>");
- } else if ("vector".equals(s)) {
- stream.print("<value>");
- } else if ("map".equals(s)) {
- stream.print("<value>");
- }
- } else {
- stream.print("<value>");
- }
- }
-
- private void printEndEnvelope(String tag) {
- if (!compoundStack.empty()) {
- String s = compoundStack.peek();
- if ("struct".equals(s)) {
- stream.print("</value>n");
- closeIndent();
- putIndent();
- stream.print("</member>n");
- } else if ("vector".equals(s)) {
- stream.print("</value>n");
- } else if ("map".equals(s)) {
- stream.print("</value>n");
- }
- } else {
- stream.print("</value>n");
- }
- }
-
- private void insideVector(String tag) {
- printBeginEnvelope(tag);
- compoundStack.push("vector");
- }
-
- private void outsideVector(String tag) throws IOException {
- String s = compoundStack.pop();
- if (!"vector".equals(s)) {
- throw new IOException("Error serializing vector.");
- }
- printEndEnvelope(tag);
- }
-
- private void insideMap(String tag) {
- printBeginEnvelope(tag);
- compoundStack.push("map");
- }
-
- private void outsideMap(String tag) throws IOException {
- String s = compoundStack.pop();
- if (!"map".equals(s)) {
- throw new IOException("Error serializing map.");
- }
- printEndEnvelope(tag);
- }
-
- private void insideRecord(String tag) {
- printBeginEnvelope(tag);
- compoundStack.push("struct");
- }
-
- private void outsideRecord(String tag) throws IOException {
- String s = compoundStack.pop();
- if (!"struct".equals(s)) {
- throw new IOException("Error serializing record.");
- }
- printEndEnvelope(tag);
- }
-
- /** Creates a new instance of XmlRecordOutput */
- public XmlRecordOutput(OutputStream out) {
- try {
- stream = new PrintStream(out, true, "UTF-8");
- compoundStack = new Stack<String>();
- } catch (UnsupportedEncodingException ex) {
- throw new RuntimeException(ex);
- }
- }
-
- public void writeByte(byte b, String tag) throws IOException {
- printBeginEnvelope(tag);
- stream.print("<ex:i1>");
- stream.print(Byte.toString(b));
- stream.print("</ex:i1>");
- printEndEnvelope(tag);
- }
-
- public void writeBool(boolean b, String tag) throws IOException {
- printBeginEnvelope(tag);
- stream.print("<boolean>");
- stream.print(b ? "1" : "0");
- stream.print("</boolean>");
- printEndEnvelope(tag);
- }
-
- public void writeInt(int i, String tag) throws IOException {
- printBeginEnvelope(tag);
- stream.print("<i4>");
- stream.print(Integer.toString(i));
- stream.print("</i4>");
- printEndEnvelope(tag);
- }
-
- public void writeLong(long l, String tag) throws IOException {
- printBeginEnvelope(tag);
- stream.print("<ex:i8>");
- stream.print(Long.toString(l));
- stream.print("</ex:i8>");
- printEndEnvelope(tag);
- }
-
- public void writeFloat(float f, String tag) throws IOException {
- printBeginEnvelope(tag);
- stream.print("<ex:float>");
- stream.print(Float.toString(f));
- stream.print("</ex:float>");
- printEndEnvelope(tag);
- }
-
- public void writeDouble(double d, String tag) throws IOException {
- printBeginEnvelope(tag);
- stream.print("<double>");
- stream.print(Double.toString(d));
- stream.print("</double>");
- printEndEnvelope(tag);
- }
-
- public void writeString(String s, String tag) throws IOException {
- printBeginEnvelope(tag);
- stream.print("<string>");
- stream.print(Utils.toXMLString(s));
- stream.print("</string>");
- printEndEnvelope(tag);
- }
-
- public void writeBuffer(Buffer buf, String tag)
- throws IOException {
- printBeginEnvelope(tag);
- stream.print("<string>");
- stream.print(Utils.toXMLBuffer(buf));
- stream.print("</string>");
- printEndEnvelope(tag);
- }
-
- public void startRecord(Record r, String tag) throws IOException {
- insideRecord(tag);
- stream.print("<struct>n");
- addIndent();
- }
-
- public void endRecord(Record r, String tag) throws IOException {
- closeIndent();
- putIndent();
- stream.print("</struct>");
- outsideRecord(tag);
- }
-
- public void startVector(ArrayList v, String tag) throws IOException {
- insideVector(tag);
- stream.print("<array>n");
- addIndent();
- }
-
- public void endVector(ArrayList v, String tag) throws IOException {
- closeIndent();
- putIndent();
- stream.print("</array>");
- outsideVector(tag);
- }
-
- public void startMap(TreeMap v, String tag) throws IOException {
- insideMap(tag);
- stream.print("<array>n");
- addIndent();
- }
-
- public void endMap(TreeMap v, String tag) throws IOException {
- closeIndent();
- putIndent();
- stream.print("</array>");
- outsideMap(tag);
- }
- }