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/*
* 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.taskdefs;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.RuntimeConfigurable;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.TypeAdapter;
/**
* Ant task to dynamically augment a previously declared reference.
* @since Ant 1.8.1
*/
public class AugmentReference extends Task implements TypeAdapter {
private String id;
/**
* {@inheritDoc}
*/
public void checkProxyClass(Class<?> proxyClass) {
}
/**
* {@inheritDoc}
*/
public synchronized Object getProxy() {
if (getProject() == null) {
throw new IllegalStateException(getTaskName() + "Project owner unset");
}
hijackId();
if (getProject().hasReference(id)) {
Object result = getProject().getReference(id);
log("project reference " + id + "=" + String.valueOf(result), Project.MSG_DEBUG);
return result;
}
throw new IllegalStateException("Unknown reference \"" + id + "\"");
}
/**
* {@inheritDoc}
*/
public void setProxy(Object o) {
throw new UnsupportedOperationException();
}
private synchronized void hijackId() {
if (id == null) {
RuntimeConfigurable wrapper = getWrapper();
id = wrapper.getId();
if (id == null) {
throw new IllegalStateException(getTaskName() + " attribute 'id' unset");
}
wrapper.setAttribute("id", null);
wrapper.removeAttribute("id");
wrapper.setElementTag("augmented reference \"" + id + "\"");
}
}
/**
* Overridden to restore the wrapper once it is no longer needed.
* @since Ant 1.8.3
*/
public void execute() {
restoreWrapperId();
}
/**
* Needed if two different targets reuse the same instance.
* @see "https://issues.apache.org/bugzilla/show_bug.cgi?id=50894"
*/
private synchronized void restoreWrapperId() {
if (id != null) {
log("restoring augment wrapper " + id, Project.MSG_DEBUG);
RuntimeConfigurable wrapper = getWrapper();
wrapper.setAttribute("id", id);
wrapper.setElementTag(getTaskName());
id = null;
}
}
}
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