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ChildMessage.java
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ChildMessage.java
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/*
* Copyright 2011 Steve Coughlan.
*
* 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 org.bitcoinj.core;
import javax.annotation.Nullable;
/**
* <p>Represents a Message type that can be contained within another Message. ChildMessages that have a cached
* backing byte array need to invalidate their parent's caches as well as their own if they are modified.</p>
*
* <p>Instances of this class are not safe for use by multiple threads.</p>
*/
public abstract class ChildMessage extends Message {
@Nullable protected Message parent;
/**
* @deprecated Use {@link #ChildMessage(NetworkParameters) instead.
*/
@Deprecated
protected ChildMessage() {
}
public ChildMessage(NetworkParameters params) {
super(params);
}
public ChildMessage(NetworkParameters params, byte[] payload, int offset, int protocolVersion) throws ProtocolException {
super(params, payload, offset, protocolVersion);
}
public ChildMessage(NetworkParameters params, byte[] payload, int offset, int protocolVersion, Message parent, MessageSerializer setSerializer, int length) throws ProtocolException {
super(params, payload, offset, protocolVersion, setSerializer, length);
this.parent = parent;
}
public ChildMessage(NetworkParameters params, byte[] payload, int offset) throws ProtocolException {
super(params, payload, offset);
}
public ChildMessage(NetworkParameters params, byte[] payload, int offset, @Nullable Message parent, MessageSerializer setSerializer, int length)
throws ProtocolException {
super(params, payload, offset, setSerializer, length);
this.parent = parent;
}
public final void setParent(@Nullable Message parent) {
if (this.parent != null && this.parent != parent && parent != null) {
// After old parent is unlinked it won't be able to receive notice if this ChildMessage
// changes internally. To be safe we invalidate the parent cache to ensure it rebuilds
// manually on serialization.
this.parent.unCache();
}
this.parent = parent;
}
/* (non-Javadoc)
* @see Message#unCache()
*/
@Override
protected void unCache() {
super.unCache();
if (parent != null)
parent.unCache();
}
protected void adjustLength(int adjustment) {
adjustLength(0, adjustment);
}
@Override
protected void adjustLength(int newArraySize, int adjustment) {
super.adjustLength(newArraySize, adjustment);
if (parent != null)
parent.adjustLength(newArraySize, adjustment);
}
}