net.sandius.rembulan.impl.AbstractMappedCollectionView Maven / Gradle / Ivy
/*
* Copyright 2016 Miroslav Janíček
*
* 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 net.sandius.rembulan.impl;
import java.util.AbstractCollection;
import java.util.Collection;
import java.util.Iterator;
abstract class AbstractMappedCollectionView extends AbstractCollection {
private final Collection collection;
public AbstractMappedCollectionView(Collection collection) {
this.collection = collection;
}
protected abstract T map(Object object);
class MappingIterator implements Iterator {
private final Iterator iterator;
private MappingIterator(Iterator iterator) {
this.iterator = iterator;
}
@Override
public boolean hasNext() {
return iterator.hasNext();
}
@Override
public T next() {
Object o = iterator.next();
return map(o);
}
@Override
public void remove() {
throw new UnsupportedOperationException("read-only view");
}
}
@Override
public Iterator iterator() {
return new MappingIterator(collection.iterator());
}
@Override
public int size() {
return collection.size();
}
}