org.drools.core.marshalling.impl.IdentityPlaceholderResolverStrategy Maven / Gradle / Ivy
/*
* Copyright 2010 Red Hat, Inc. and/or its affiliates.
*
* 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.drools.core.marshalling.impl;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.HashMap;
import java.util.IdentityHashMap;
import java.util.Map;
import org.kie.api.marshalling.ObjectMarshallingStrategy;
import org.kie.api.marshalling.ObjectMarshallingStrategy.Context;
import org.kie.api.marshalling.ObjectMarshallingStrategyAcceptor;
public class IdentityPlaceholderResolverStrategy
implements
ObjectMarshallingStrategy {
private Map ids;
private Map objects;
private String name = IdentityPlaceholderResolverStrategy.class.getName();
private ObjectMarshallingStrategyAcceptor acceptor;
public IdentityPlaceholderResolverStrategy(ObjectMarshallingStrategyAcceptor acceptor) {
this.acceptor = acceptor;
this.ids = new HashMap();
this.objects = new IdentityHashMap();
}
public IdentityPlaceholderResolverStrategy(String name, ObjectMarshallingStrategyAcceptor acceptor) {
this( acceptor );
this.name = name;
}
public IdentityPlaceholderResolverStrategy(ObjectMarshallingStrategyAcceptor acceptor, Map ids) {
this(acceptor);
setIds(ids);
}
public IdentityPlaceholderResolverStrategy(String name, ObjectMarshallingStrategyAcceptor acceptor, Map ids){
this( acceptor, ids );
this.name = name;
}
@Override
public String getName(){
return this.name;
}
public Object read(ObjectInputStream os) throws IOException,
ClassNotFoundException {
int id = os.readInt();
return ids.get( id );
}
public void write(ObjectOutputStream os,
Object object) throws IOException {
Integer id = ( Integer ) objects.get( object );
if ( id == null ) {
id = ids.size();
ids.put( id, object );
objects.put( object, id );
}
os.writeInt( id );
}
public boolean accept(Object object) {
return this.acceptor.accept( object );
}
public byte[] marshal(Context context,
ObjectOutputStream os,
Object object) {
Integer id = ( Integer ) objects.get( object );
if ( id == null ) {
id = ids.size();
ids.put( id, object );
objects.put( object, id );
}
return intToByteArray( id.intValue() );
}
public Object unmarshal(Context context,
ObjectInputStream is,
byte[] object,
ClassLoader classloader ) {
return ids.get( byteArrayToInt( object ) );
}
private final byte[] intToByteArray(int value) {
return new byte[] {
(byte) ((value >>> 24) & 0xFF),
(byte) ((value >>> 16) & 0xFF),
(byte) ((value >>> 8) & 0xFF),
(byte) (value & 0xFF) };
}
private final int byteArrayToInt(byte [] b) {
return (b[0] << 24)
+ ((b[1] & 0xFF) << 16)
+ ((b[2] & 0xFF) << 8)
+ (b[3] & 0xFF);
}
public Context createContext() {
// no need for context
return null;
}
public Map getIds() {
return ids;
}
public void setIds(Map ids) {
this.ids = ids;
objects.clear();
for (Map.Entry idEntry : ids.entrySet()) {
objects.put(idEntry.getValue(), idEntry.getKey());
}
}
}