/*
* 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.core.util;
import java.util.NoSuchElementException;
import org.drools.core.common.InternalFactHandle;
import org.drools.core.util.ObjectHashMap.ObjectEntry;
import org.kie.api.runtime.ObjectFilter;
public class JavaIteratorAdapter
implements
java.util.Iterator {
public static final int OBJECT = 0;
public static final int FACT_HANDLE = 1;
private Iterator iterator;
private ObjectEntry nextEntry;
private ObjectFilter filter;
private int type;
public JavaIteratorAdapter(Iterator iterator,
int type) {
this( iterator,
type,
null );
}
public JavaIteratorAdapter(Iterator iterator,
int type,
ObjectFilter filter) {
this.iterator = iterator;
this.filter = filter;
this.type = type;
setNext();
}
public boolean hasNext() {
return (this.nextEntry != null);
}
public Object next() {
ObjectEntry current = this.nextEntry;
if ( current != null ) {
setNext();
} else {
throw new NoSuchElementException( "No more elements to return" );
}
if ( this.type == OBJECT ) {
return ((InternalFactHandle) current.getKey()).getObject();
} else {
return current.getKey();
}
}
private void setNext() {
ObjectEntry entry = null;
while ( entry == null ) {
entry = (ObjectEntry) this.iterator.next();
if ( entry == null ) {
break;
}
if ( this.filter != null ) {
Object object = ((InternalFactHandle) entry.getKey()).getObject();
if ( this.filter.accept( object ) == false ) {
entry = null;
}
}
}
this.nextEntry = entry;
// this.nextHandle = handle;
// this.nextObject = object;
}
public void remove() {
throw new UnsupportedOperationException( "remove() is not support" );
}
}