Life Cycle Task : Custom Task « Ant « Java
Life Cycle Task
/*
*
* Licensed 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.mwrm.ant.tasks;
import java.util.Hashtable;
import java.util.Enumeration;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.BuildException;
/**
* <p>At each stage in a task's life cycle, this class displays information
* to show the internal state of the task and its position with in the project.
* It takes a <code>name</code> attribute.</p>
*/
public class LifeCycleTask extends Task {
/** The <code>name</code> attribute of this task. */
private String name;
/** The body text of this task. */
private String text;
/**
* <p>The constructor displays the state of the task
* as it is instantiated.</p>
*/
public LifeCycleTask() {
System.out.println("---------------");
System.out.println("Constructor called");
System.out.println("Value of name attribute: " + name);
System.out.println("Value of the body text: " + text);
System.out.println("Project: " + getProject());
System.out.println("Location: " + getLocation());
System.out.println("Target: " + getOwningTarget());
System.out.println("---------------");
}
/**
* <p>Displays the state of the task at initialization.</p>
* @see #logAll(String method)
*/
public final void init() {
logAll("init()");
}
/**
* <p>Displays the state of the task when Ant runs it.
* This method also runs some usage checks
* to ensure the task is being used properly.</p>
*/
public final void execute() {
if (name == null) {
throw new BuildException("You must specify a name attribute in "
+ getTaskName() + ".");
}
logAll("execute()");
// Write the name to output
log(name, Project.MSG_INFO);
}
/**
* <p>Sets the name to display
* and shows the state of the task afterwards.</p>
* @param aName The name to display
*/
public final void setName(final String aName) {
// The value of the name attribute
this.name = aName;
logAll("setName()");
}
/**
* <p>Sets the body text of the task
* and shows the state of the task afterwards.</p>
* @param bodyText The body text
*/
public final void addText(final String bodyText) {
// If the body text is just whitespace, it might as well be null
if (bodyText.trim().equals("")) {
this.text = null;
} else {
this.text = bodyText.trim();
}
logAll("addText()");
}
/** <p>Checks for task references.</p>
* @return String
* A string that tells us details of the reference check
*/
private String referenceCheck() {
// The default setting
String setString = "Reference not found.";
// We need the references that have been set in this project
Hashtable refs = getProject().getReferences();
Enumeration e = refs.elements();
// Let's iterate over them
while (e.hasMoreElements()) {
// We want to work with each object, so we'll instantiate an object
Object obj = e.nextElement();
// Check to see whether this object is a task
// If it is, we'll build a string that contains its name and type
if (obj.getClass().getName().
equals("org.apache.tools.ant.UnknownElement")
||
obj.getClass().getName().
equals(this.getClass().getName())) {
Task aTask = (Task) obj;
setString =
"Reference to " + aTask.getTaskName() + " found, of type "
+ aTask.getClass().getName() + ". ";
setString = setString + "Its id is "
+ aTask.getRuntimeConfigurableWrapper().
getAttributeMap().get("id") + ".";
}
}
return setString;
}
/**
* <p>A central logging method that all the life-cycle methods call
* to display the state of the task.
* It displays the value of the <code>name</code> attribute
* and other information about the task,
* including the name of its project and its location in the build file.</p>
* @param method The name of the method that issued the logging call
*/
public final void logAll(final String method) {
log("---------------", Project.MSG_VERBOSE);
log(method + " called", Project.MSG_VERBOSE);
log("Value of name attribute: " + name, Project.MSG_VERBOSE);
log("Value of the body text: " + text, Project.MSG_VERBOSE);
log("Project: " + getProject().getName(), Project.MSG_VERBOSE);
// Here we build some information on the location
// within the build file
String locationString = getLocation().getFileName();
locationString = locationString + " at line "
+ getLocation().getLineNumber();
// Location.getColumnNumber() is for Ant 1.7+
// Comment it out if you are using Ant 1.6.x
//locationString = locationString + " and column "
// + getLocation().getColumnNumber();
log("Location: " + locationString, Project.MSG_VERBOSE);
// We could use the Location.toString() method
//log("Location: " + getLocation(), Project.MSG_VERBOSE);
log("Target: " + getOwningTarget(), Project.MSG_VERBOSE);
// referenceCheck() returns a string with information
// on any references to custom tasks
log(referenceCheck(), Project.MSG_VERBOSE);
// If the configuration wrapper is null, we use its
// run-time equivalent
if (getWrapper() == null) {
log("Reference id: "
+ getRuntimeConfigurableWrapper().getAttributeMap().get("id"),
Project.MSG_VERBOSE);
} else {
// This time we use the protected getWrapper() method
log("Reference id: " + getWrapper().getAttributeMap().get("id"),
Project.MSG_VERBOSE);
}
log("---------------", Project.MSG_VERBOSE);
}
}
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