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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.types;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
/**
* Class to hold a reference to another object in the project.
*
*/
public class Reference {
private String refid;
private Project project;
/**
* Create a reference.
* @deprecated since 1.7.
* Please use {@link Reference#Reference(Project,String)}
* instead.
*/
public Reference() {
}
/**
* Create a reference to a named ID.
* @param id the name of this reference
* @deprecated since 1.7.
* Please use {@link Reference#Reference(Project,String)}
* instead.
*/
public Reference(String id) {
setRefId(id);
}
/**
* Create a reference to a named ID in a particular project.
* @param p the project this reference is associated with
* @param id the name of this reference
* @since Ant 1.6.3
*/
public Reference(Project p, String id) {
setRefId(id);
setProject(p);
}
/**
* Set the reference id. Should not normally be necessary;
* use {@link Reference#Reference(Project, String)}.
* @param id the reference id to use
*/
public void setRefId(String id) {
refid = id;
}
/**
* Get the reference id of this reference.
* @return the reference id
*/
public String getRefId() {
return refid;
}
/**
* Set the associated project. Should not normally be necessary;
* use {@link Reference#Reference(Project,String)}.
* @param p the project to use
* @since Ant 1.6.3
*/
public void setProject(Project p) {
this.project = p;
}
/**
* Get the associated project, if any; may be null.
* @return the associated project
* @since Ant 1.6.3
*/
public Project getProject() {
return project;
}
/**
* Resolve the reference, using the associated project if
* it set, otherwise use the passed in project.
* @param fallback the fallback project to use if the project attribute of
* reference is not set.
* @return the dereferenced object.
* @throws BuildException if the reference cannot be dereferenced.
*/
public Object getReferencedObject(Project fallback) throws BuildException {
if (refid == null) {
throw new BuildException("No reference specified");
}
Object o = project == null ? fallback.getReference(refid) : project.getReference(refid);
if (o == null) {
throw new BuildException("Reference " + refid + " not found.");
}
return o;
}
/**
* Resolve the reference, looking in the associated project.
* @see Project#getReference
* @return the dereferenced object.
* @throws BuildException if the project is null or the reference cannot be dereferenced
* @since Ant 1.6.3
*/
public Object getReferencedObject() throws BuildException {
if (project == null) {
throw new BuildException("No project set on reference to " + refid);
}
return getReferencedObject(project);
}
}
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