com.metamx.common.guava.DroppingIterator Maven / Gradle / Ivy
/*
* Copyright 2011,2012 Metamarkets Group 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 com.metamx.common.guava;
import java.util.Iterator;
/**
*/
public class DroppingIterator implements Iterator
{
private final Iterator delegate;
private final int numToDrop;
private boolean dropped = false;
public DroppingIterator(
Iterator delegate,
int numToDrop
)
{
this.delegate = delegate;
this.numToDrop = numToDrop;
}
public boolean hasNext()
{
if (! dropped) {
for (int i = 0; i < numToDrop; ++i) {
delegate.next();
}
dropped = true;
}
return delegate.hasNext();
}
public T next()
{
if (! dropped) {
for (int i = 0; i < numToDrop; ++i) {
delegate.next();
}
dropped = true;
}
return delegate.next();
}
public void remove()
{
throw new UnsupportedOperationException();
}
}