How to Create your own Ant task in java

/*
Code revised from



Cooking with Java XP
by Eric M. Burke and Brian M. Coyner

ISBN: 0-596-00387-0
Pages: 288
*/

















classname="DialogBoxTask"
classpath="${dir.build}"/>

title="Important Question"
property="response"
optiontype="yes_no"/>



This is a dialog with a multi-line message.





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import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.ProjectHelper;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.types.EnumeratedAttribute;

import javax.swing.*;

public class DialogBoxTask extends Task {
private String message;
private String title = "Question";
private int optionType = -1;
private String propertyName;

public void setTitle(String title) {
this.title = title;
}

public void setProperty(String propertyName) {
this.propertyName = propertyName;
}

public void setOptiontype(OptionType ot) {
log("Calling setOptionType: " + ot.getValue(),
Project.MSG_DEBUG);

String value = ot.getValue();
if ("ok".equals(value)) {
optionType = -1;
} else if ("ok_cancel".equals(value)) {
optionType = JOptionPane.OK_CANCEL_OPTION;
} else if ("yes_no".equals(value)) {
optionType = JOptionPane.YES_NO_OPTION;
} else {
// only remaining possibility
optionType = JOptionPane.YES_NO_CANCEL_OPTION;
}
}

public void setMessage(String msg) {
// ant always replaces properties for attributes
message = msg;
}

public void addText(String msg) {
if (message == null) {
message = "";
}
// we must manually replace properties for nested text
message += ProjectHelper.replaceProperties(
getProject(), msg, getProject().getProperties());
}

public void execute() throws BuildException {
validateAttributes();

log("optionType = " + optionType, Project.MSG_DEBUG);

if (optionType == -1) {
JOptionPane.showMessageDialog(
null, // parent
message,
title,
JOptionPane.INFORMATION_MESSAGE);
} else {
int response = JOptionPane.showConfirmDialog(
null, // parent
message,
title,
optionType,
JOptionPane.QUESTION_MESSAGE);
if (propertyName != null) {
String responseText = formatResponseCode(response);
log("Setting " + propertyName + " to " + responseText,
Project.MSG_VERBOSE);
getProject().setProperty(propertyName, responseText);
}
}
}

protected void validateAttributes() {
if (message == null) {
throw new BuildException("Message must be specified using the "
+ "message attribute or nested text.");
}

if (optionType == -1 && propertyName != null) {
throw new BuildException(
"Cannot specify property unless optionType is "
+ "'ok_cancel', 'yes_no', or 'yes_no_cancel'");
}
}

public static class OptionType extends EnumeratedAttribute {
public String[] getValues() {
return new String[]{
"ok",
"ok_cancel",
"yes_no",
"yes_no_cancel",
};
}
}

private String formatResponseCode(int optionPaneResponse) {
switch (optionPaneResponse) {
// note: JOptionPane.OK_OPTION is the same as YES_OPTION
case JOptionPane.YES_OPTION:
return "yes";
case JOptionPane.NO_OPTION:
return "no";
case JOptionPane.CANCEL_OPTION:
case JOptionPane.CLOSED_OPTION:
return "cancel";
default:
throw new BuildException("Internal error: Unknown option " +
"pane response: " + optionPaneResponse);
}
}
}