| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.felix.framework.resolver; |
| |
| import java.util.Comparator; |
| |
| import org.apache.felix.framework.wiring.BundleCapabilityImpl; |
| import org.osgi.framework.Constants; |
| import org.osgi.framework.Version; |
| import org.osgi.framework.wiring.BundleCapability; |
| import org.osgi.framework.wiring.BundleRevision; |
| import org.osgi.resource.Capability; |
| |
| public class CandidateComparator implements Comparator<Capability> |
| { |
| public int compare(Capability cap1, Capability cap2) |
| { |
| // First check resolved state, since resolved capabilities have priority |
| // over unresolved ones. Compare in reverse order since we want to sort |
| // in descending order. |
| int c = 0; |
| |
| BundleCapability bcap1 = null; |
| BundleCapability bcap2 = null; |
| |
| if (cap1 instanceof BundleCapability && |
| cap2 instanceof BundleCapability) |
| { |
| bcap1 = (BundleCapability) cap1; |
| bcap2 = (BundleCapability) cap2; |
| |
| if ((bcap1.getRevision().getWiring() != null) |
| && (bcap2.getRevision().getWiring() == null)) |
| { |
| c = -1; |
| } |
| else if ((bcap1.getRevision().getWiring() == null) |
| && (bcap2.getRevision().getWiring() != null)) |
| { |
| c = 1; |
| } |
| } |
| |
| // Compare revision capabilities. |
| if ((c == 0) && cap1.getNamespace().equals(BundleRevision.BUNDLE_NAMESPACE)) |
| { |
| c = ((Comparable) cap1.getAttributes().get(BundleRevision.BUNDLE_NAMESPACE)) |
| .compareTo(cap2.getAttributes().get(BundleRevision.BUNDLE_NAMESPACE)); |
| if (c == 0) |
| { |
| Version v1 = (!cap1.getAttributes().containsKey(Constants.BUNDLE_VERSION_ATTRIBUTE)) |
| ? Version.emptyVersion |
| : (Version) cap1.getAttributes().get(Constants.BUNDLE_VERSION_ATTRIBUTE); |
| Version v2 = (!cap2.getAttributes().containsKey(Constants.BUNDLE_VERSION_ATTRIBUTE)) |
| ? Version.emptyVersion |
| : (Version) cap2.getAttributes().get(Constants.BUNDLE_VERSION_ATTRIBUTE); |
| // Compare these in reverse order, since we want |
| // highest version to have priority. |
| c = v2.compareTo(v1); |
| } |
| } |
| // Compare package capabilities. |
| else if ((c == 0) && cap1.getNamespace().equals(BundleRevision.PACKAGE_NAMESPACE)) |
| { |
| c = ((Comparable) cap1.getAttributes().get(BundleRevision.PACKAGE_NAMESPACE)) |
| .compareTo(cap2.getAttributes().get(BundleRevision.PACKAGE_NAMESPACE)); |
| if (c == 0) |
| { |
| Version v1 = (!cap1.getAttributes().containsKey(BundleCapabilityImpl.VERSION_ATTR)) |
| ? Version.emptyVersion |
| : (Version) cap1.getAttributes().get(BundleCapabilityImpl.VERSION_ATTR); |
| Version v2 = (!cap2.getAttributes().containsKey(BundleCapabilityImpl.VERSION_ATTR)) |
| ? Version.emptyVersion |
| : (Version) cap2.getAttributes().get(BundleCapabilityImpl.VERSION_ATTR); |
| // Compare these in reverse order, since we want |
| // highest version to have priority. |
| c = v2.compareTo(v1); |
| } |
| } |
| |
| // Finally, compare bundle identity. |
| if (c == 0 && bcap1 != null && bcap2 != null) |
| { |
| if (bcap1.getRevision().getBundle().getBundleId() < |
| bcap2.getRevision().getBundle().getBundleId()) |
| { |
| c = -1; |
| } |
| else if (bcap1.getRevision().getBundle().getBundleId() > |
| bcap2.getRevision().getBundle().getBundleId()) |
| { |
| c = 1; |
| } |
| } |
| |
| return c; |
| } |
| } |