/*******************************************************************************
* Copyright (c) 2007 IBM Corporation.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package com.ibm.wala.util.intset;
import java.util.Iterator;
import java.util.NoSuchElementException;
/**
* An ordinal set mapping, backed a delegate, but adding an offset to each index.
*/
public class OffsetOrdinalSetMapping<T> implements OrdinalSetMapping<T> {
private final OrdinalSetMapping<T> delegate;
private final int offset;
private OffsetOrdinalSetMapping(OrdinalSetMapping<T> delegate, int offset) {
this.delegate = delegate;
this.offset = offset;
}
@Override
public int getMaximumIndex() {
return offset + delegate.getMaximumIndex();
}
@Override
public int getSize() {
return delegate.getSize();
}
public static <T> OffsetOrdinalSetMapping<T> make(OrdinalSetMapping<T> delegate, int offset) {
if (delegate == null) {
throw new IllegalArgumentException("null delegate");
}
return new OffsetOrdinalSetMapping<T>(delegate, offset);
}
public static <T> OffsetOrdinalSetMapping<T> make(int offset) {
MutableMapping<T> m = MutableMapping.make();
return new OffsetOrdinalSetMapping<T>(m, offset);
}
@Override
public int add(T o) {
return offset + delegate.add(o);
}
@Override
public int getMappedIndex(Object o) {
if (delegate.getMappedIndex(o) == -1) {
return -1;
}
return offset + delegate.getMappedIndex(o);
}
@Override
public T getMappedObject(int n) throws NoSuchElementException {
return delegate.getMappedObject(n - offset);
}
@Override
public boolean hasMappedIndex(T o) {
return delegate.hasMappedIndex(o);
}
@Override
public Iterator<T> iterator() {
return delegate.iterator();
}
}