001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements. See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership. The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License. You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019 package org.apache.hadoop.record;
020
021 import java.io.IOException;
022 import java.util.TreeMap;
023 import java.util.ArrayList;
024 import java.io.PrintStream;
025 import java.io.OutputStream;
026 import java.io.UnsupportedEncodingException;
027
028 import org.apache.hadoop.classification.InterfaceAudience;
029 import org.apache.hadoop.classification.InterfaceStability;
030
031 /**
032 * @deprecated Replaced by <a href="http://hadoop.apache.org/avro/">Avro</a>.
033 */
034 @Deprecated
035 @InterfaceAudience.Public
036 @InterfaceStability.Stable
037 public class CsvRecordOutput implements RecordOutput {
038
039 private PrintStream stream;
040 private boolean isFirst = true;
041
042 private void throwExceptionOnError(String tag) throws IOException {
043 if (stream.checkError()) {
044 throw new IOException("Error serializing "+tag);
045 }
046 }
047
048 private void printCommaUnlessFirst() {
049 if (!isFirst) {
050 stream.print(",");
051 }
052 isFirst = false;
053 }
054
055 /** Creates a new instance of CsvRecordOutput */
056 public CsvRecordOutput(OutputStream out) {
057 try {
058 stream = new PrintStream(out, true, "UTF-8");
059 } catch (UnsupportedEncodingException ex) {
060 throw new RuntimeException(ex);
061 }
062 }
063
064 public void writeByte(byte b, String tag) throws IOException {
065 writeLong((long)b, tag);
066 }
067
068 public void writeBool(boolean b, String tag) throws IOException {
069 printCommaUnlessFirst();
070 String val = b ? "T" : "F";
071 stream.print(val);
072 throwExceptionOnError(tag);
073 }
074
075 public void writeInt(int i, String tag) throws IOException {
076 writeLong((long)i, tag);
077 }
078
079 public void writeLong(long l, String tag) throws IOException {
080 printCommaUnlessFirst();
081 stream.print(l);
082 throwExceptionOnError(tag);
083 }
084
085 public void writeFloat(float f, String tag) throws IOException {
086 writeDouble((double)f, tag);
087 }
088
089 public void writeDouble(double d, String tag) throws IOException {
090 printCommaUnlessFirst();
091 stream.print(d);
092 throwExceptionOnError(tag);
093 }
094
095 public void writeString(String s, String tag) throws IOException {
096 printCommaUnlessFirst();
097 stream.print(Utils.toCSVString(s));
098 throwExceptionOnError(tag);
099 }
100
101 public void writeBuffer(Buffer buf, String tag)
102 throws IOException {
103 printCommaUnlessFirst();
104 stream.print(Utils.toCSVBuffer(buf));
105 throwExceptionOnError(tag);
106 }
107
108 public void startRecord(Record r, String tag) throws IOException {
109 if (tag != null && !"".equals(tag)) {
110 printCommaUnlessFirst();
111 stream.print("s{");
112 isFirst = true;
113 }
114 }
115
116 public void endRecord(Record r, String tag) throws IOException {
117 if (tag == null || "".equals(tag)) {
118 stream.print("\n");
119 isFirst = true;
120 } else {
121 stream.print("}");
122 isFirst = false;
123 }
124 }
125
126 public void startVector(ArrayList v, String tag) throws IOException {
127 printCommaUnlessFirst();
128 stream.print("v{");
129 isFirst = true;
130 }
131
132 public void endVector(ArrayList v, String tag) throws IOException {
133 stream.print("}");
134 isFirst = false;
135 }
136
137 public void startMap(TreeMap v, String tag) throws IOException {
138 printCommaUnlessFirst();
139 stream.print("m{");
140 isFirst = true;
141 }
142
143 public void endMap(TreeMap v, String tag) throws IOException {
144 stream.print("}");
145 isFirst = false;
146 }
147 }