| /******************************************************************************* |
| * Copyright (c) 2007, 2010 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.p2.engine.query; |
| |
| import org.eclipse.equinox.p2.metadata.IInstallableUnit; |
| import org.eclipse.equinox.p2.metadata.expression.*; |
| import org.eclipse.equinox.p2.query.ExpressionMatchQuery; |
| |
| /** |
| * A query that searches for {@link IInstallableUnit} instances that have |
| * a property associated with the specified profile, whose value matches the provided value. |
| * @since 2.0 |
| */ |
| public class IUProfilePropertyQuery extends ExpressionMatchQuery<IInstallableUnit> { |
| /** |
| * A property value constant that will match any defined property value. |
| * @see #IUProfilePropertyQuery(String, String) |
| */ |
| public static final String ANY = "*"; //$NON-NLS-1$ |
| |
| private static final IExpression matchValue = ExpressionUtil.parse("profileProperties[$0] == $1"); //$NON-NLS-1$ |
| private static final IExpression matchAny = ExpressionUtil.parse("profileProperties[$0] != null"); //$NON-NLS-1$ |
| |
| private static IMatchExpression<IInstallableUnit> createMatch(String propertyName, String propertyValue) { |
| IExpressionFactory factory = ExpressionUtil.getFactory(); |
| return ANY.equals(propertyValue) ? factory.<IInstallableUnit> matchExpression(matchAny, propertyName) : factory.<IInstallableUnit> matchExpression(matchValue, propertyName, propertyValue); |
| } |
| |
| /** |
| * Creates a new query on the given property name and value. |
| * Because the queryable for this query is typically the profile |
| * instance, we use a reference to the profile rather than the |
| * profile id for performance reasons. |
| * @param propertyName The name of the property to match |
| * @param propertyValue The value to compare to. A value of {@link #ANY} will match any value. |
| */ |
| public IUProfilePropertyQuery(String propertyName, String propertyValue) { |
| super(IInstallableUnit.class, createMatch(propertyName, propertyValue)); |
| } |
| } |