/*******************************************************************************
* Copyright (c) 2002 - 2006 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.collections;
import com.ibm.wala.util.debug.Assertions;
import com.ibm.wala.util.debug.UnimplementedError;
import com.ibm.wala.util.intset.IntIterator;
/**
* An Iterator which provides a concatenation of two IntIterators.
*/
public class CompoundIntIterator implements IntIterator {
final IntIterator A;
final IntIterator B;
/**
* @param A the first iterator in the concatenated result
* @param B the second iterator in the concatenated result
*/
public CompoundIntIterator(IntIterator A, IntIterator B) {
this.A = A;
this.B = B;
if (A == null) {
throw new IllegalArgumentException("null A");
}
if (B == null) {
throw new IllegalArgumentException("null B");
}
}
@Override
public boolean hasNext() {
return A.hasNext() || B.hasNext();
}
@Override
public int next() {
if (A.hasNext()) {
return A.next();
} else {
return B.next();
}
}
@Override
public int hashCode() throws UnimplementedError {
Assertions.UNREACHABLE("define a custom hash code to avoid non-determinism");
return 0;
}
}