diff options
Diffstat (limited to 'framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/Last.java')
-rw-r--r-- | framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/Last.java | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/Last.java b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/Last.java new file mode 100644 index 00000000..312271b2 --- /dev/null +++ b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/Last.java @@ -0,0 +1,73 @@ +/* + * 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.Iterator; +import java.util.List; + +import org.apache.tools.ant.BuildException; +import org.apache.tools.ant.Project; +import org.apache.tools.ant.types.Resource; +import org.apache.tools.ant.types.ResourceCollection; + +/** + * ResourceCollection that contains the last <code>count</code> elements of + * another ResourceCollection, a la the UNIX tail command. + * @since Ant 1.7.1 + */ +public class Last extends SizeLimitCollection { + + /** + * Take the last <code>count</code> elements. + * @return a Collection of Resources. + */ + protected Collection<Resource> getCollection() { + int count = getValidCount(); + ResourceCollection rc = getResourceCollection(); + int i = count; + Iterator<Resource> iter = rc.iterator(); + int size = rc.size(); + for (; i < size; i++) { + iter.next(); + } + + List<Resource> al = new ArrayList<Resource>(count); + for (; iter.hasNext(); i++) { + al.add(iter.next()); + } + int found = al.size(); + if (found == count || (size < count && found == size)) { + return al; + } + + //mismatch: + String msg = "Resource collection " + rc + " reports size " + size + + " but returns " + i + " elements."; + + //size was understated -> too many results; warn and continue: + if (found > count) { + log(msg, Project.MSG_WARN); + return al.subList(found - count, found); + } + //size was overstated; we missed some and are now in error-land: + throw new BuildException(msg); + } + +} |