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/*
* Copyright 2004 Apache Software Foundation
*
* 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.apache.tools.ant.taskdefs.condition;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.ComponentHelper;
import org.apache.tools.ant.ProjectComponent;
import org.apache.tools.ant.AntTypeDefinition;
/**
* looks for a task or other Ant type that exists. Existence is defined as
* the type is defined, and its implementation class is present. This
* will work for datatypes and preset, script and macro definitions.
* @author Steve Loughran
*/
public class TypeFound extends ProjectComponent implements Condition {
private String name;
/**
* the task or other type to look for
* @param name the name of the type
*/
public void setName(String name) {
this.name = name;
}
/**
* test for a task or other ant type existing in the current project
* @param typename the name of the type
* @return true if the typename exists
*/
protected boolean doesTypeExist(String typename) {
ComponentHelper helper =
ComponentHelper.getComponentHelper(getProject());
AntTypeDefinition def = helper.getDefinition(typename);
if (def == null) {
return false;
}
//now verify that the class has an implementation
return def.getExposedClass(getProject()) != null;
}
/**
* Is this condition true?
* @return true if the condition is true
* @exception BuildException if an error occurs
*/
public boolean eval() throws BuildException {
if (name == null) {
throw new BuildException("No type specified");
}
return doesTypeExist(name);
}
}
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