/**
* Copyright 2015 Santhosh Kumar Tekuri
*
* The JLibs authors license 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 jlibs.core.graph.sequences;
import jlibs.core.graph.Sequence;
import jlibs.core.graph.Filter;
/**
* @author Santhosh Kumar T
*/
public class FilteredSequence<E> extends AbstractSequence<E>{
private Sequence<? extends E> delegate;
private Filter<E> filter;
public FilteredSequence(Sequence<? extends E> delegate, Filter<E> filter){
this.delegate = delegate;
this.filter = filter;
}
/*-------------------------------------------------[ Advancing ]---------------------------------------------------*/
@Override
protected E findNext(){
while(true){
E elem = delegate.next();
if(elem==null || filter.select(elem))
return elem;
}
}
/*-------------------------------------------------[ Reuse ]---------------------------------------------------*/
@Override
public void reset(){
super.reset();
_reset();
}
private void _reset(){
delegate.reset();
}
@Override
public Sequence<E> copy(){
return new FilteredSequence<E>(delegate.copy(), filter);
}
}