| /******************************************************************************* |
| * Copyright (c) 2009, 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.repository.artifact; |
| |
| import org.eclipse.equinox.p2.metadata.IArtifactKey; |
| import org.eclipse.equinox.p2.metadata.VersionRange; |
| import org.eclipse.equinox.p2.metadata.expression.ExpressionUtil; |
| import org.eclipse.equinox.p2.metadata.expression.IExpression; |
| import org.eclipse.equinox.p2.query.ExpressionMatchQuery; |
| import org.eclipse.equinox.p2.query.IQueryable; |
| |
| /** |
| * A general purpose query for matching {@link IArtifactKey} instances |
| * that satisfy various criteria. |
| * |
| * @since 2.0 |
| */ |
| public class ArtifactKeyQuery extends ExpressionMatchQuery<IArtifactKey> { |
| private static final IExpression matchKey = ExpressionUtil.parse("this == $0"); //$NON-NLS-1$ |
| private static final IExpression matchID = ExpressionUtil.parse("id == $0"); //$NON-NLS-1$ |
| private static final IExpression matchIDClassifierRange = ExpressionUtil.parse("id == $0 && version ~= $2 && (null == $1 || classifier == $1)"); //$NON-NLS-1$ |
| |
| private static IExpression createMatchExpression(IArtifactKey key) { |
| if (key == null) |
| return ExpressionUtil.TRUE_EXPRESSION; |
| return ExpressionUtil.getFactory().<IArtifactKey> matchExpression(matchKey, key); |
| } |
| |
| private static IExpression createMatchExpression(String classifier, String id, VersionRange range) { |
| if (range == null) { |
| if (classifier == null) { |
| if (id == null) |
| return ExpressionUtil.TRUE_EXPRESSION; |
| return ExpressionUtil.getFactory().<IArtifactKey> matchExpression(matchID, id); |
| } |
| range = VersionRange.emptyRange; |
| } |
| return ExpressionUtil.getFactory().<IArtifactKey> matchExpression(matchIDClassifierRange, id, classifier, range); |
| } |
| |
| /** |
| * A singleton artifact key query that will always match every artifact key in |
| * the given {@link IQueryable}. |
| */ |
| public static final ArtifactKeyQuery ALL_KEYS = new ArtifactKeyQuery(); |
| |
| /** |
| * Pass the id and/or version range to match IArtifactKeys against. |
| * Passing null results in matching any id/version |
| * @param classifier The artifact key classifier, or <code>null</code> |
| * @param id The artifact key id, or <code>null</code> |
| * @param range A version range, or <code>null</code> |
| */ |
| public ArtifactKeyQuery(String classifier, String id, VersionRange range) { |
| super(IArtifactKey.class, createMatchExpression(classifier, id, range)); |
| } |
| |
| private ArtifactKeyQuery() { |
| super(IArtifactKey.class, ExpressionUtil.TRUE_EXPRESSION); |
| } |
| |
| /** |
| * Creates an artifact key query that will match any key equal to the |
| * provided key |
| * @param key the input key to test for equality in the query |
| */ |
| public ArtifactKeyQuery(IArtifactKey key) { |
| super(IArtifactKey.class, createMatchExpression(key)); |
| } |
| } |