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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.cluster;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.io.stream.StreamableReader;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import java.io.IOException;
/**
* Abstract diffable object with simple diffs implementation that sends the entire object if object has changed or
* nothing is object remained the same.
*/
public abstract class AbstractDiffable<T extends Diffable<T>> implements Diffable<T> {
@Override
public Diff<T> diff(T previousState) {
if (this.get().equals(previousState)) {
return new CompleteDiff<>();
} else {
return new CompleteDiff<>(get());
}
}
@Override
public Diff<T> readDiffFrom(StreamInput in) throws IOException {
return new CompleteDiff<>(this, in);
}
public static <T extends Diffable<T>> Diff<T> readDiffFrom(StreamableReader<T> reader, StreamInput in) throws IOException {
return new CompleteDiff<T>(reader, in);
}
private static class CompleteDiff<T extends Diffable<T>> implements Diff<T> {
@Nullable
private final T part;
/**
* Creates simple diff with changes
*/
public CompleteDiff(T part) {
this.part = part;
}
/**
* Creates simple diff without changes
*/
public CompleteDiff() {
this.part = null;
}
/**
* Read simple diff from the stream
*/
public CompleteDiff(StreamableReader<T> reader, StreamInput in) throws IOException {
if (in.readBoolean()) {
this.part = reader.readFrom(in);
} else {
this.part = null;
}
}
@Override
public void writeTo(StreamOutput out) throws IOException {
if (part != null) {
out.writeBoolean(true);
part.writeTo(out);
} else {
out.writeBoolean(false);
}
}
@Override
public T apply(T part) {
if (this.part != null) {
return this.part;
} else {
return part;
}
}
}
@SuppressWarnings("unchecked")
public T get() {
return (T) this;
}
}
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