How to use a Class argument in a custom class attribute in java

/*
*
* 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 org.apache.tools.ant.Project;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.BuildException;

/**
*

The ClassSetTask class
* demonstrates how to use a Class argument
* in a custom class attribute.

*
*/

public class ClassSetTask extends Task {

/** The qualified class name. */
private Class qualifiedName;

/**
*

Runs the task and displays the qualified name of the class
* that is set as the setQualifiedName attribute.

*
*/
public final void execute() {
log("qualifiedName: " + qualifiedName, Project.MSG_INFO);
}

/**
*

Sets the fully qualified name of the class.

** @param qName The fully qualified name of a class
*/
public final void setQualifiedName(final Class qName) {
if (qName.getName().equals("java.lang.Integer")
||
qName.getName().equals("java.lang.String")) {
log(qName.getName() + " found.", Project.MSG_INFO);
} else {
String msg = "You can only specify java.lang.Integer "
+ "or java.lang.String in qualifiedName.";
throw new BuildException(msg);
}
this.qualifiedName = qName;
}
}