org.apache.hadoop.record.XmlRecordOutput Maven / Gradle / Ivy
/**
* 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;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/**
* XML Serializer.
*
* @deprecated Replaced by Avro.
*/
@Deprecated
@InterfaceAudience.Public
@InterfaceStability.Stable
public class XmlRecordOutput implements RecordOutput {
private PrintStream stream;
private int indent = 0;
private Stack compoundStack;
private void putIndent() {
StringBuilder sb = new StringBuilder("");
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("\n");
addIndent();
putIndent();
stream.print(""+tag+" \n");
putIndent();
stream.print("");
} else if ("vector".equals(s)) {
stream.print("");
} else if ("map".equals(s)) {
stream.print("");
}
} else {
stream.print("");
}
}
private void printEndEnvelope(String tag) {
if (!compoundStack.empty()) {
String s = compoundStack.peek();
if ("struct".equals(s)) {
stream.print(" \n");
closeIndent();
putIndent();
stream.print(" \n");
} else if ("vector".equals(s)) {
stream.print("\n");
} else if ("map".equals(s)) {
stream.print("\n");
}
} else {
stream.print("\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();
} catch (UnsupportedEncodingException ex) {
throw new RuntimeException(ex);
}
}
@Override
public void writeByte(byte b, String tag) throws IOException {
printBeginEnvelope(tag);
stream.print("");
stream.print(Byte.toString(b));
stream.print(" ");
printEndEnvelope(tag);
}
@Override
public void writeBool(boolean b, String tag) throws IOException {
printBeginEnvelope(tag);
stream.print("");
stream.print(b ? "1" : "0");
stream.print(" ");
printEndEnvelope(tag);
}
@Override
public void writeInt(int i, String tag) throws IOException {
printBeginEnvelope(tag);
stream.print("");
stream.print(Integer.toString(i));
stream.print(" ");
printEndEnvelope(tag);
}
@Override
public void writeLong(long l, String tag) throws IOException {
printBeginEnvelope(tag);
stream.print("");
stream.print(Long.toString(l));
stream.print(" ");
printEndEnvelope(tag);
}
@Override
public void writeFloat(float f, String tag) throws IOException {
printBeginEnvelope(tag);
stream.print("");
stream.print(Float.toString(f));
stream.print(" ");
printEndEnvelope(tag);
}
@Override
public void writeDouble(double d, String tag) throws IOException {
printBeginEnvelope(tag);
stream.print("");
stream.print(Double.toString(d));
stream.print(" ");
printEndEnvelope(tag);
}
@Override
public void writeString(String s, String tag) throws IOException {
printBeginEnvelope(tag);
stream.print("");
stream.print(Utils.toXMLString(s));
stream.print(" ");
printEndEnvelope(tag);
}
@Override
public void writeBuffer(Buffer buf, String tag)
throws IOException {
printBeginEnvelope(tag);
stream.print("");
stream.print(Utils.toXMLBuffer(buf));
stream.print(" ");
printEndEnvelope(tag);
}
@Override
public void startRecord(Record r, String tag) throws IOException {
insideRecord(tag);
stream.print("\n");
addIndent();
}
@Override
public void endRecord(Record r, String tag) throws IOException {
closeIndent();
putIndent();
stream.print(" ");
outsideRecord(tag);
}
@Override
public void startVector(ArrayList v, String tag) throws IOException {
insideVector(tag);
stream.print("\n");
addIndent();
}
@Override
public void endVector(ArrayList v, String tag) throws IOException {
closeIndent();
putIndent();
stream.print(" ");
outsideVector(tag);
}
@Override
public void startMap(TreeMap v, String tag) throws IOException {
insideMap(tag);
stream.print("\n");
addIndent();
}
@Override
public void endMap(TreeMap v, String tag) throws IOException {
closeIndent();
putIndent();
stream.print(" ");
outsideMap(tag);
}
}