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MapExternalizer.java
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MapExternalizer.java
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/*
* JBoss, Home of Professional Open Source.
* Copyright 2015, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.wildfly.clustering.marshalling.spi.util;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.Map;
import java.util.function.Function;
import org.wildfly.clustering.marshalling.Externalizer;
import org.wildfly.clustering.marshalling.spi.IndexSerializer;
/**
* Externalizers for implementations of {@link Map}.
* @author Paul Ferraro
*/
public abstract class MapExternalizer<T extends Map<Object, Object>, C> implements Externalizer<T> {
private final Class<T> targetClass;
private final Function<C, T> factory;
@SuppressWarnings("unchecked")
protected MapExternalizer(Class<?> targetClass, Function<C, T> factory) {
this.targetClass = (Class<T>) targetClass;
this.factory = factory;
}
@Override
public void writeObject(ObjectOutput output, T map) throws IOException {
this.writeContext(output, map);
IndexSerializer.VARIABLE.writeInt(output, map.size());
for (Map.Entry<Object, Object> entry : map.entrySet()) {
output.writeObject(entry.getKey());
output.writeObject(entry.getValue());
}
}
@Override
public T readObject(ObjectInput input) throws IOException, ClassNotFoundException {
C context = this.readContext(input);
T map = this.factory.apply(context);
int size = IndexSerializer.VARIABLE.readInt(input);
for (int i = 0; i < size; ++i) {
map.put(input.readObject(), input.readObject());
}
return map;
}
@Override
public Class<T> getTargetClass() {
return this.targetClass;
}
/**
* Writes the context of the specified map to the specified output stream.
* @param output an output stream
* @param map the target map
* @throws IOException if the constructor context cannot be written to the stream
*/
protected abstract void writeContext(ObjectOutput output, T map) throws IOException;
/**
* Reads the map context from the specified input stream.
* @param input an input stream
* @return the map constructor context
* @throws IOException if the constructor context cannot be read from the stream
* @throws ClassNotFoundException if a class could not be found
*/
protected abstract C readContext(ObjectInput input) throws IOException, ClassNotFoundException;
}