/**
* Copyright 2010 JBoss Inc
*
* 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.base;
import org.drools.FactHandle;
import org.drools.WorkingMemory;
import org.drools.spi.JavaFact;
public class DelegateJavaFactHandler
implements
JavaFact {
private JavaFactRegistryEntry[] entries;
public JavaFactRegistryEntry[] listWorkingMemories() {
return this.entries;
}
public boolean register(final WorkingMemory workingMemory) {
if ( workingMemory == null ) {
return false;
}
if ( isRegistered( workingMemory ) ) {
return false;
}
final JavaFactRegistryEntry[] newEntries;
int position;
if ( this.entries == null ) {
newEntries = new JavaFactRegistryEntry[1];
position = 0;
} else {
final int newLength = this.entries.length + 1;
newEntries = new JavaFactRegistryEntry[newLength];
System.arraycopy( this.entries,
0,
newEntries,
0,
newLength - 1 );
position = this.entries.length;
}
final FactHandle handle = workingMemory.insert( this );
newEntries[position] = new JavaFactRegistryEntry( workingMemory,
handle );
this.entries = newEntries;
return true;
}
public void unregisterAll() {
for ( int i = 0, length = this.entries.length; i < length; i++ ) {
final WorkingMemory workingMemory = this.entries[i].getWorkingMemory();
final FactHandle handle = this.entries[i].getFactHandle();
workingMemory.retract( handle );
}
}
public boolean unregister(final WorkingMemory workingMemory) {
if ( this.entries == null ) {
return false;
}
// If there is only one entry, see if it matched and if so null
if ( this.entries.length == 1 && this.entries[0].getWorkingMemory() == workingMemory ) {
this.entries = null;
return true;
}
// try the first
if ( this.entries[0].getWorkingMemory() == workingMemory ) {
final JavaFactRegistryEntry[] newEntries = new JavaFactRegistryEntry[this.entries.length - 1];
System.arraycopy( this.entries,
1,
newEntries,
0,
newEntries.length );
this.entries = newEntries;
return true;
}
// try the last
if ( this.entries[this.entries.length - 1].getWorkingMemory() == workingMemory ) {
final JavaFactRegistryEntry[] newEntries = new JavaFactRegistryEntry[this.entries.length - 1];
System.arraycopy( this.entries,
0,
newEntries,
0,
newEntries.length );
this.entries = newEntries;
return true;
}
// try middle
for ( int i = 0, length = this.entries.length; i < length; i++ ) {
if ( this.entries[i].getWorkingMemory() == workingMemory ) {
final JavaFactRegistryEntry[] newEntries = new JavaFactRegistryEntry[this.entries.length - 1];
System.arraycopy( this.entries,
0,
newEntries,
0,
i );
System.arraycopy( this.entries,
i + 1,
newEntries,
i,
newEntries.length - 1 );
this.entries = newEntries;
return true;
}
}
return false;
}
public boolean isRegistered(final WorkingMemory workingMemory) {
if ( this.entries == null ) {
return false;
}
for ( int i = 0, length = this.entries.length; i < length; i++ ) {
if ( this.entries[i].getWorkingMemory() == workingMemory ) {
return true;
}
}
return false;
}
public int[] getChanges() {
// TODO Auto-generated method stub
return null;
}
}