org.osgl.util.DelegatingIterator Maven / Gradle / Ivy
package org.osgl.util;
/*-
* #%L
* Java Tool
* %%
* Copyright (C) 2014 - 2017 OSGL (Open Source General Library)
* %%
* 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.
* #L%
*/
import java.util.Iterator;
/**
* Created with IntelliJ IDEA.
* User: luog
* Date: 6/10/13
* Time: 10:37 AM
* To change this template use File | Settings | File Templates.
*/
public class DelegatingIterator implements Iterator {
private final Iterator itr_;
protected final boolean readOnly;
DelegatingIterator(Iterator itr, boolean readOnly) {
this.itr_ = itr;
this.readOnly = readOnly;
}
protected Iterator itr() {
return itr_;
}
protected final void mutableOperation() {
if (readOnly) {
throw new UnsupportedOperationException();
}
}
@Override
public boolean hasNext() {
return itr_.hasNext();
}
@Override
public T next() {
return itr_.next();
}
@Override
public void remove() {
mutableOperation();
itr_.remove();
}
public static Iterator of(Iterator iterator, boolean readOnly) {
return new DelegatingIterator(iterator, readOnly);
}
}