diff options
Diffstat (limited to 'framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/Difference.java')
-rw-r--r-- | framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/Difference.java | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/Difference.java b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/Difference.java new file mode 100644 index 00000000..3f3c983c --- /dev/null +++ b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/Difference.java @@ -0,0 +1,63 @@ +/* + * 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.tools.ant.types.resources; + +import java.util.ArrayList; +import java.util.Collection; +import java.util.HashSet; +import java.util.List; +import java.util.Set; + +import org.apache.tools.ant.BuildException; +import org.apache.tools.ant.types.Resource; +import org.apache.tools.ant.types.ResourceCollection; + +/** + * ResourceCollection representing the difference between + * two or more nested ResourceCollections. + * @since Ant 1.7 + */ +public class Difference extends BaseResourceCollectionContainer { + + /** + * Calculate the difference of the nested ResourceCollections. + * @return a Collection of Resources. + */ + protected Collection<Resource> getCollection() { + List<ResourceCollection> rcs = getResourceCollections(); + int size = rcs.size(); + if (size < 2) { + throw new BuildException("The difference of " + size + + " resource collection" + ((size == 1) ? "" : "s") + + " is undefined."); + } + Set<Resource> hs = new HashSet<Resource>(); + List<Resource> al = new ArrayList<Resource>(); + for (ResourceCollection rc : rcs) { + for (Resource r : rc) { + if (hs.add(r)) { + al.add(r); + } else { + al.remove(r); + } + } + } + return al; + } + +} |