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/*******************************************************************************
* Copyright (c) 2007 IBM Corporation and others.
* 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 org.eclipse.equinox.p2.query;
/**
* A query that combines a group of other queries.
*/
public class CompoundQuery extends Query {
private boolean and;
private Query[] queries;
/**
* Creates a compound query that combines the given queries. The queries
* will be performed by the compound query in the given order. This method
* might not perform all queries if it can determine the result of the compound
* expression without doing so.
*
* @param queries The queries to perform
* @param and <code>true</code> if this query represents a logical 'and', and
* <code>false</code> if this query represents a logical 'or'.
*/
public CompoundQuery(Query[] queries, boolean and) {
this.queries = queries;
this.and = and;
}
public Query[] getQueries() {
return queries;
}
/**
* Returns whether this compound query combines its queries with a logical
* 'and' or 'or'.
* @return <code>true</code> if this query represents a logical 'and', and
* <code>false</code> if this query represents a logical 'or'.
*/
public boolean isAnd() {
return and;
}
/* (non-Javadoc)
* @see org.eclipse.equinox.p2.query2.Query#isMatch(java.lang.Object)
*/
public boolean isMatch(Object candidate) {
for (int i = 0; i < queries.length; i++) {
boolean valid = queries[i].isMatch(candidate);
// if we are OR'ing then the first time we find a requirement that is met, return success
if (valid && !and)
return true;
// if we are AND'ing then the first time we find a requirement that is NOT met, return failure
if (!valid && and)
return false;
}
// if we get past the requirements check and we are AND'ing then return true
// since all requirements must have been met. If we are OR'ing then return false
// since none of the requirements were met.
return and;
}
}
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