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Copy pathIxReadOnly.java
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90 lines (72 loc) · 2.12 KB
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/*
* Copyright 2011-2016 David Karnok
*
* 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 ix;
import java.util.Iterator;
/**
* Suppress or throw when the remove() is called.
*
* @param <T> the value type
*/
final class IxReadOnly<T> extends IxSource<T, T> {
final boolean silent;
IxReadOnly(Iterable<T> source, boolean silent) {
super(source);
this.silent = silent;
}
@Override
public Iterator<T> iterator() {
if (silent) {
return new ReadOnlySilentIterator<T>(source.iterator());
}
return new ReadOnlyThrowingIterator<T>(source.iterator());
}
static final class ReadOnlySilentIterator<T> implements Iterator<T> {
final Iterator<T> source;
ReadOnlySilentIterator(Iterator<T> source) {
this.source = source;
}
@Override
public boolean hasNext() {
return source.hasNext();
}
@Override
public T next() {
return source.next();
}
@Override
public void remove() {
// deliberately ignored
}
}
static final class ReadOnlyThrowingIterator<T> implements Iterator<T> {
final Iterator<T> source;
ReadOnlyThrowingIterator(Iterator<T> source) {
this.source = source;
}
@Override
public boolean hasNext() {
return source.hasNext();
}
@Override
public T next() {
return source.next();
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}
}