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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.Resource;
/**
* Condition that checks whether a given resource exists.
*
* @since Ant 1.8.0
*/
public class ResourceExists extends ProjectComponent implements Condition {
private Resource resource;
/**
* The resource to test.
*/
public void add(Resource r) {
if (resource != null) {
throw new BuildException("only one resource can be tested");
}
resource = r;
}
/**
* Argument validation.
*/
protected void validate() throws BuildException {
if (resource == null) {
throw new BuildException("resource is required");
}
}
public boolean eval() throws BuildException {
validate();
return resource.isExists();
}
}
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