/*
* 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.resources;
import java.util.Iterator;
import java.util.Stack;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.types.DataType;
import org.apache.tools.ant.types.Mapper;
import org.apache.tools.ant.types.Reference;
import org.apache.tools.ant.types.Resource;
import org.apache.tools.ant.types.ResourceCollection;
import org.apache.tools.ant.util.FileNameMapper;
import org.apache.tools.ant.util.IdentityMapper;
/**
* Wrapper around a resource collections that maps the names of the
* other collection using a configured mapper.
* @since Ant 1.8.0
*/
public class MappedResourceCollection
extends DataType implements ResourceCollection, Cloneable {
private ResourceCollection nested = null;
private Mapper mapper = null;
/**
* Adds the required nested ResourceCollection.
* @param c the ResourceCollection to add.
* @throws BuildException on error.
*/
public synchronized void add(ResourceCollection c) throws BuildException {
if (isReference()) {
throw noChildrenAllowed();
}
if (nested != null) {
throw new BuildException("Only one resource collection can be"
+ " nested into mappedresources",
getLocation());
}
setChecked(false);
nested = c;
}
/**
* Define the mapper to map source to destination files.
* @return a mapper to be configured.
* @exception BuildException if more than one mapper is defined.
*/
public Mapper createMapper() throws BuildException {
if (isReference()) {
throw noChildrenAllowed();
}
if (mapper != null) {
throw new BuildException("Cannot define more than one mapper",
getLocation());
}
setChecked(false);
mapper = new Mapper(getProject());
return mapper;
}
/**
* Add a nested filenamemapper.
* @param fileNameMapper the mapper to add.
* @since Ant 1.6.3
*/
public void add(FileNameMapper fileNameMapper) {
createMapper().add(fileNameMapper);
}
/**
* {@inheritDoc}
*/
public boolean isFilesystemOnly() {
if (isReference()) {
return ((MappedResourceCollection) getCheckedRef())
.isFilesystemOnly();
}
checkInitialized();
return false;
}
/**
* {@inheritDoc}
*/
public int size() {
if (isReference()) {
return ((MappedResourceCollection) getCheckedRef()).size();
}
checkInitialized();
return nested.size();
}
/**
* {@inheritDoc}
*/
public Iterator iterator() {
if (isReference()) {
return ((MappedResourceCollection) getCheckedRef()).iterator();
}
checkInitialized();
return new MappedIterator(nested.iterator(), mapper);
}
/**
* Overrides the base version.
* @param r the Reference to set.
*/
public void setRefid(Reference r) {
if (nested != null || mapper != null) {
throw tooManyAttributes();
}
super.setRefid(r);
}
/**
* Implement clone. The nested resource collection and mapper are copied.
* @return a cloned instance.
*/
public Object clone() {
try {
MappedResourceCollection c =
(MappedResourceCollection) super.clone();
c.nested = nested;
c.mapper = mapper;
return c;
} catch (CloneNotSupportedException e) {
throw new BuildException(e);
}
}
/**
* Overrides the version of DataType to recurse on all DataType
* child elements that may have been added.
* @param stk the stack of data types to use (recursively).
* @param p the project to use to dereference the references.
* @throws BuildException on error.
*/
protected synchronized void dieOnCircularReference(Stack stk, Project p)
throws BuildException {
if (isChecked()) {
return;
}
if (isReference()) {
super.dieOnCircularReference(stk, p);
} else {
checkInitialized();
if (mapper != null) {
pushAndInvokeCircularReferenceCheck(mapper, stk, p);
}
if (nested instanceof DataType) {
pushAndInvokeCircularReferenceCheck((DataType) nested, stk, p);
}
setChecked(true);
}
}
private void checkInitialized() {
if (nested == null) {
throw new BuildException("A nested resource collection element is"
+ " required", getLocation());
}
dieOnCircularReference();
}
private static class MappedIterator implements Iterator {
private final Iterator sourceIterator;
private final FileNameMapper mapper;
private MappedIterator(Iterator source, Mapper m) {
sourceIterator = source;
if (m != null) {
mapper = m.getImplementation();
} else {
mapper = new IdentityMapper();
}
}
public boolean hasNext() {
return sourceIterator.hasNext();
}
public Object next() {
return new MappedResource((Resource) sourceIterator.next(),
mapper);
}
public void remove() {
throw new UnsupportedOperationException();
}
}
}