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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.condition;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.ProjectComponent;
import org.apache.tools.ant.types.Reference;
/**
* Condition that tests whether a given reference has been defined.
*
* <p>Optionally tests whether it is of a given type/class.</p>
*
* @since Ant 1.6
*/
public class IsReference extends ProjectComponent implements Condition {
private Reference ref;
private String type;
/**
* Set the refid attribute.
*
* @param r a Reference value
*/
public void setRefid(Reference r) {
ref = r;
}
/**
* Set the type attribute. This is optional attribute.
*
* @param type an ant component type name
*/
public void setType(String type) {
this.type = type;
}
/**
* @return true if the reference exists and if type is set, if
* the reference is the same type
* @exception BuildException if an error occurs
*/
public boolean eval() throws BuildException {
if (ref == null) {
throw new BuildException("No reference specified for isreference "
+ "condition");
}
String key = ref.getRefId();
if (!getProject().hasReference(key)) {
return false;
} else if (type == null) {
return true;
} else {
Object o = getProject().getReference(key);
Class typeClass =
(Class) getProject().getDataTypeDefinitions().get(type);
if (typeClass == null) {
typeClass =
(Class) getProject().getTaskDefinitions().get(type);
}
if (typeClass == null) {
// don't know the type, should throw exception instead?
return false;
}
return typeClass.isAssignableFrom(o.getClass());
}
}
}
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