jlibs.core.graph.sequences.IterableSequence Maven / Gradle / Ivy
/**
* 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 java.util.Collection;
import java.util.Iterator;
/**
* @author Santhosh Kumar T
*/
public class IterableSequence extends AbstractSequence{
private Iterable iterable;
public IterableSequence(Iterable iterable){
this.iterable = iterable;
_reset();
}
/*-------------------------------------------------[ Advancing ]---------------------------------------------------*/
private Iterator iter;
@Override
protected E findNext(){
return iter.hasNext() ? iter.next() : null;
}
/*-------------------------------------------------[ Reuse ]---------------------------------------------------*/
@Override
public void reset(){
super.reset();
_reset();
}
private void _reset(){
iter = iterable.iterator();
}
@Override
public IterableSequence copy(){
return new IterableSequence(iterable);
}
/*-------------------------------------------------[ Optimization ]---------------------------------------------------*/
@Override
public int length(){
if(iterable instanceof Collection)
return ((Collection) iterable).size();
else
return super.length();
}
}