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/*
* Copyright 2009-2010 Amazon Technologies, Inc. or its affiliates.
* Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
* of Amazon Technologies, Inc. or its affiliates. All rights reserved.
*
* Licensed 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 com.amazon.carbonado.layout;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
/**
* Extra options encoded with a Storable layout.
*
* @author Brian S O'Neill
*/
public class LayoutOptions {
/**
* Data is compression algorithm name, encoded by DataOutput.writeUTF.
*/
static final byte COMPRESSION_TYPE = 1;
private final Map<Byte, Object> mData;
private boolean mReadOnly;
public LayoutOptions() {
mData = new HashMap<Byte, Object>(1);
}
/**
* @return null if not compressed
*/
public synchronized String getCompressionType() {
return (String) mData.get(COMPRESSION_TYPE);
}
/**
* @param type null if not compressed
*/
public void setCompressionType(String type) {
put(COMPRESSION_TYPE, type);
}
private synchronized void put(byte op, Object value) {
if (mReadOnly) {
throw new IllegalStateException("Options are read only");
}
if (value == null) {
mData.remove(op);
} else {
mData.put(op, value);
}
}
synchronized void readOnly() {
mReadOnly = true;
}
/**
* @return null if empty
*/
synchronized byte[] encode() {
if (mData.isEmpty()) {
return null;
}
try {
ByteArrayOutputStream bout = new ByteArrayOutputStream();
DataOutputStream dout = new DataOutputStream(bout);
for (Map.Entry<Byte, Object> entry : mData.entrySet()) {
switch (entry.getKey()) {
default:
break;
case COMPRESSION_TYPE:
dout.write(COMPRESSION_TYPE);
dout.writeUTF((String) entry.getValue());
}
}
dout.close();
return bout.toByteArray();
} catch (IOException e) {
throw new AssertionError(e);
}
}
/**
* @param source can be null if empty
*/
synchronized void decode(byte[] source) throws IOException {
mData.clear();
if (source == null || source.length == 0) {
return;
}
ByteArrayInputStream bin = new ByteArrayInputStream(source);
DataInputStream din = new DataInputStream(bin);
while (bin.available() > 0) {
byte op = din.readByte();
switch (op) {
default:
throw new IOException("Unknown extra data type: " + op);
case COMPRESSION_TYPE:
mData.put(COMPRESSION_TYPE, din.readUTF());
break;
}
}
}
}
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