CsvRecordOutput.java
上传用户:quxuerui
上传日期:2018-01-08
资源大小:41811k
文件大小:4k
- /**
- * 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;
- /**
- */
- public class CsvRecordOutput implements RecordOutput {
- private PrintStream stream;
- private boolean isFirst = true;
-
- private void throwExceptionOnError(String tag) throws IOException {
- if (stream.checkError()) {
- throw new IOException("Error serializing "+tag);
- }
- }
-
- private void printCommaUnlessFirst() {
- if (!isFirst) {
- stream.print(",");
- }
- isFirst = false;
- }
-
- /** Creates a new instance of CsvRecordOutput */
- public CsvRecordOutput(OutputStream out) {
- try {
- stream = new PrintStream(out, true, "UTF-8");
- } catch (UnsupportedEncodingException ex) {
- throw new RuntimeException(ex);
- }
- }
-
- public void writeByte(byte b, String tag) throws IOException {
- writeLong((long)b, tag);
- }
-
- public void writeBool(boolean b, String tag) throws IOException {
- printCommaUnlessFirst();
- String val = b ? "T" : "F";
- stream.print(val);
- throwExceptionOnError(tag);
- }
-
- public void writeInt(int i, String tag) throws IOException {
- writeLong((long)i, tag);
- }
-
- public void writeLong(long l, String tag) throws IOException {
- printCommaUnlessFirst();
- stream.print(l);
- throwExceptionOnError(tag);
- }
-
- public void writeFloat(float f, String tag) throws IOException {
- writeDouble((double)f, tag);
- }
-
- public void writeDouble(double d, String tag) throws IOException {
- printCommaUnlessFirst();
- stream.print(d);
- throwExceptionOnError(tag);
- }
-
- public void writeString(String s, String tag) throws IOException {
- printCommaUnlessFirst();
- stream.print(Utils.toCSVString(s));
- throwExceptionOnError(tag);
- }
-
- public void writeBuffer(Buffer buf, String tag)
- throws IOException {
- printCommaUnlessFirst();
- stream.print(Utils.toCSVBuffer(buf));
- throwExceptionOnError(tag);
- }
-
- public void startRecord(Record r, String tag) throws IOException {
- if (tag != null && !"".equals(tag)) {
- printCommaUnlessFirst();
- stream.print("s{");
- isFirst = true;
- }
- }
-
- public void endRecord(Record r, String tag) throws IOException {
- if (tag == null || "".equals(tag)) {
- stream.print("n");
- isFirst = true;
- } else {
- stream.print("}");
- isFirst = false;
- }
- }
-
- public void startVector(ArrayList v, String tag) throws IOException {
- printCommaUnlessFirst();
- stream.print("v{");
- isFirst = true;
- }
-
- public void endVector(ArrayList v, String tag) throws IOException {
- stream.print("}");
- isFirst = false;
- }
-
- public void startMap(TreeMap v, String tag) throws IOException {
- printCommaUnlessFirst();
- stream.print("m{");
- isFirst = true;
- }
-
- public void endMap(TreeMap v, String tag) throws IOException {
- stream.print("}");
- isFirst = false;
- }
- }