svn commit: r1177837 - /felix/sandbox/rickhall/framework-r5/src/main/java/org/apache/felix/framework/wiring/CandidateComparator.java

[ri...@apache.org]

Author: rickhall
Date: Fri Sep 30 21:03:53 2011
New Revision: 1177837

URL: http://svn.apache.org/viewvc?rev=1177837&view=rev
Log:
Move candidate comparator to wiring package, since the resolver doesn't use it.

Added:
    felix/sandbox/rickhall/framework-r5/src/main/java/org/apache/felix/framework/wiring/CandidateComparator.java

Added: felix/sandbox/rickhall/framework-r5/src/main/java/org/apache/felix/framework/wiring/CandidateComparator.java
URL: http://svn.apache.org/viewvc/felix/sandbox/rickhall/framework-r5/src/main/java/org/apache/felix/framework/wiring/CandidateComparator.java?rev=1177837&view=auto
==============================================================================
--- felix/sandbox/rickhall/framework-r5/src/main/java/org/apache/felix/framework/wiring/CandidateComparator.java (added)
+++ felix/sandbox/rickhall/framework-r5/src/main/java/org/apache/felix/framework/wiring/CandidateComparator.java Fri Sep 30 21:03:53 2011
@@ -0,0 +1,100 @@
+/*
+ * 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.wiring;
+
+import java.util.Comparator;
+import org.osgi.framework.Constants;
+import org.osgi.framework.Version;
+import org.osgi.framework.wiring.BundleCapability;
+import org.osgi.framework.wiring.BundleRevision;
+
+public class CandidateComparator implements Comparator<BundleCapability>
+{
+    public int compare(BundleCapability cap1, BundleCapability 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;
+        if ((cap1.getRevision().getWiring() != null)
+            && (cap2.getRevision().getWiring() == null))
+        {
+            c = -1;
+        }
+        else if ((cap1.getRevision().getWiring() == null)
+            && (cap2.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)
+        {
+            if (cap1.getRevision().getBundle().getBundleId() <
+                cap2.getRevision().getBundle().getBundleId())
+            {
+                c = -1;
+            }
+            else if (cap1.getRevision().getBundle().getBundleId() >
+                cap2.getRevision().getBundle().getBundleId())
+            {
+                c = 1;
+            }
+        }
+
+        return c;
+    }
+}
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