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/*******************************************************************************
* Copyright (c) 2007, 2009 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
* Cloudsmith Inc. - converted into expression based query
*******************************************************************************/
package org.eclipse.equinox.internal.p2.metadata.query;
import org.eclipse.equinox.p2.metadata.IInstallableUnit;
import org.eclipse.equinox.p2.metadata.expression.*;
import org.eclipse.equinox.p2.metadata.query.ExpressionQuery;
/**
* A query that searches for {@link IInstallableUnit} instances that have
* a property whose value matches the provided value. If no property name is
* specified, then all {@link IInstallableUnit} instances are accepted.
*/
public final class IUPropertyQuery extends ExpressionQuery<IInstallableUnit> {
public static final String ANY = "*"; //$NON-NLS-1$
private static final IExpression matchTrueExpression = ExpressionUtil.parse("properties[$0] == true"); //$NON-NLS-1$
private static final IExpression matchNullExpression = ExpressionUtil.parse("properties[$0] == null"); //$NON-NLS-1$
private static final IExpression matchAnyExpression = ExpressionUtil.parse("properties[$0] != null"); //$NON-NLS-1$
private static final IExpression matchValueExpression = ExpressionUtil.parse("properties[$0] == $1"); //$NON-NLS-1$
public static IMatchExpression<IInstallableUnit> createMatchExpression(String propertyName, String propertyValue) {
IExpressionFactory factory = ExpressionUtil.getFactory();
if (propertyName == null)
return MATCH_ALL_UNITS;
if (propertyValue == null)
return factory.<IInstallableUnit> matchExpression(matchNullExpression, propertyName);
if (ANY.equals(propertyValue))
return factory.<IInstallableUnit> matchExpression(matchAnyExpression, propertyName);
if (Boolean.valueOf(propertyValue).booleanValue())
return factory.<IInstallableUnit> matchExpression(matchTrueExpression, propertyName);
return factory.<IInstallableUnit> matchExpression(matchValueExpression, propertyName, propertyValue);
}
/**
* Creates a new query on the given property name and value.
*/
public IUPropertyQuery(String propertyName, String propertyValue) {
super(IInstallableUnit.class, createMatchExpression(propertyName, propertyValue));
}
}
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