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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 java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.MagicNames;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.PropertyHelper;
import org.apache.tools.ant.Task;
/**
* This task is designed to allow the user to install a different
* PropertyHelper on the current Project. This task also allows the
* installation of PropertyHelper delegates on either the newly installed
* or existing PropertyHelper.
* @since Ant 1.8
*/
public class PropertyHelperTask extends Task {
/**
* Nested delegate for refid usage.
*/
public final class DelegateElement {
private String refid;
private DelegateElement() {
}
/**
* Get the refid.
* @return String
*/
public String getRefid() {
return refid;
}
/**
* Set the refid.
* @param refid the String to set
*/
public void setRefid(String refid) {
this.refid = refid;
}
private PropertyHelper.Delegate resolve() {
if (refid == null) {
throw new BuildException("refid required for generic delegate");
}
return (PropertyHelper.Delegate) getProject().getReference(refid);
}
}
private PropertyHelper propertyHelper;
private List delegates;
/**
* Add a new PropertyHelper to be set on the Project.
* @param propertyHelper the PropertyHelper to set.
*/
public synchronized void addConfigured(PropertyHelper propertyHelper) {
if (this.propertyHelper != null) {
throw new BuildException("Only one PropertyHelper can be installed");
}
this.propertyHelper = propertyHelper;
}
/**
* Add a PropertyHelper delegate to the existing or new PropertyHelper.
* @param delegate the delegate to add.
*/
public synchronized void addConfigured(PropertyHelper.Delegate delegate) {
getAddDelegateList().add(delegate);
}
/**
* Add a nested <delegate refid="foo" /> element.
* @return DelegateElement
*/
public DelegateElement createDelegate() {
DelegateElement result = new DelegateElement();
getAddDelegateList().add(result);
return result;
}
/**
* Execute the task.
* @throws BuildException on error.
*/
public void execute() throws BuildException {
if (getProject() == null) {
throw new BuildException("Project instance not set");
}
if (propertyHelper == null && delegates == null) {
throw new BuildException("Either a new PropertyHelper"
+ " or one or more PropertyHelper delegates are required");
}
PropertyHelper ph = propertyHelper;
if (ph == null) {
ph = PropertyHelper.getPropertyHelper(getProject());
} else {
ph = propertyHelper;
}
synchronized (ph) {
if (delegates != null) {
for (Iterator iter = delegates.iterator(); iter.hasNext();) {
Object o = iter.next();
PropertyHelper.Delegate delegate = o instanceof DelegateElement
? ((DelegateElement) o).resolve() : (PropertyHelper.Delegate) o;
log("Adding PropertyHelper delegate " + delegate, Project.MSG_DEBUG);
ph.add(delegate);
}
}
}
if (propertyHelper != null) {
log("Installing PropertyHelper " + propertyHelper, Project.MSG_DEBUG);
// TODO copy existing properties to new PH?
getProject().addReference(MagicNames.REFID_PROPERTY_HELPER, propertyHelper);
}
}
private synchronized List getAddDelegateList() {
if (delegates == null) {
delegates = new ArrayList();
}
return delegates;
}
}
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