jlibs.core.graph.sequences.DuplicateSequence 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;
/**
* @author Santhosh Kumar T
*/
public class DuplicateSequence extends AbstractSequence{
private E elem;
private int count;
public DuplicateSequence(E elem){
this(elem, 1);
}
public DuplicateSequence(E elem, int count){
//noinspection ConstantConditions
if(elem==null)
throw new IllegalArgumentException("elem can't be null");
if(count<0)
throw new IllegalArgumentException(String.format("can't duplicate %d times", count));
this.elem = elem;
this.count = count;
_reset();
}
/*-------------------------------------------------[ Advancing ]---------------------------------------------------*/
private int pos;
@Override
protected E findNext(){
pos++;
return pos<=count ? elem : null;
}
/*-------------------------------------------------[ Reuse ]---------------------------------------------------*/
@Override
public void reset(){
super.reset();
_reset();
}
private void _reset(){
pos = 0;
}
@Override
public DuplicateSequence copy(){
return new DuplicateSequence(elem, count);
}
/*-------------------------------------------------[ Optimization ]---------------------------------------------------*/
@Override
public int length(){
return count;
}
}