/*
* 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.io.File;
import java.util.List;
import java.util.Stack;
import java.util.Vector;
import java.util.Iterator;
import java.util.Collection;
import java.util.Collections;
import java.util.AbstractCollection;
import java.util.NoSuchElementException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.types.DataType;
import org.apache.tools.ant.types.ResourceCollection;
/**
* Generic ResourceCollection: Either stores nested ResourceCollections,
* making no attempt to remove duplicates, or references another ResourceCollection.
* @since Ant 1.7
*/
public class Resources extends DataType implements ResourceCollection {
/** static empty ResourceCollection */
public static final ResourceCollection NONE = new ResourceCollection() {
public boolean isFilesystemOnly() {
return true;
}
public Iterator iterator() {
return EMPTY_ITERATOR;
}
public int size() {
return 0;
}
};
/** static empty Iterator */
public static final Iterator EMPTY_ITERATOR = new Iterator() {
public Object next() {
throw new NoSuchElementException();
}
public boolean hasNext() {
return false;
}
public void remove() {
throw new UnsupportedOperationException();
}
};
private class MyCollection extends AbstractCollection {
private int size;
MyCollection() {
size = 0;
for (Iterator rci = getNested().iterator(); rci.hasNext();) {
size += ((ResourceCollection) rci.next()).size();
}
}
public int size() {
return size;
}
public Iterator iterator() {
return new MyIterator();
}
private class MyIterator implements Iterator {
private Iterator rci = getNested().iterator();
private Iterator ri = null;
public boolean hasNext() {
boolean result = ri != null && ri.hasNext();
while (!result && rci.hasNext()) {
ri = ((ResourceCollection) rci.next()).iterator();
result = ri.hasNext();
}
return result;
}
public Object next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
return ri.next();
}
public void remove() {
throw new UnsupportedOperationException();
}
}
}
private Vector rc;
private Collection coll;
/**
* Add a ResourceCollection.
* @param c the ResourceCollection to add.
*/
public synchronized void add(ResourceCollection c) {
if (isReference()) {
throw noChildrenAllowed();
}
if (c == null) {
return;
}
if (rc == null) {
rc = new Vector();
}
rc.add(c);
FailFast.invalidate(this);
coll = null;
setChecked(false);
}
/**
* Fulfill the ResourceCollection contract.
* @return an Iterator of Resources.
*/
public synchronized Iterator iterator() {
if (isReference()) {
return getRef().iterator();
}
validate();
return new FailFast(this, coll.iterator());
}
/**
* Fulfill the ResourceCollection contract.
* @return number of elements as int.
*/
public synchronized int size() {
if (isReference()) {
return getRef().size();
}
validate();
return coll.size();
}
/**
* Fulfill the ResourceCollection contract.
* @return true if all Resources represent files.
*/
public boolean isFilesystemOnly() {
if (isReference()) {
return getRef().isFilesystemOnly();
}
validate();
for (Iterator i = getNested().iterator(); i.hasNext();) {
if ((!((ResourceCollection) i.next()).isFilesystemOnly())) {
return false;
}
}
return true;
}
/**
* Format this BaseResourceCollectionContainer as a String.
* @return a descriptive <code>String</code>.
*/
public synchronized String toString() {
if (isReference()) {
return getCheckedRef().toString();
}
if (coll == null || coll.isEmpty()) {
return "";
}
StringBuffer sb = new StringBuffer();
for (Iterator i = coll.iterator(); i.hasNext();) {
if (sb.length() > 0) {
sb.append(File.pathSeparatorChar);
}
sb.append(i.next());
}
return sb.toString();
}
/**
* 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 void dieOnCircularReference(Stack stk, Project p)
throws BuildException {
if (isChecked()) {
return;
}
if (isReference()) {
super.dieOnCircularReference(stk, p);
} else {
for (Iterator i = getNested().iterator(); i.hasNext();) {
Object o = i.next();
if (o instanceof DataType) {
invokeCircularReferenceCheck((DataType) o, stk, p);
}
}
setChecked(true);
}
}
/**
* Resolves references, allowing any ResourceCollection.
* @return the referenced ResourceCollection.
*/
private ResourceCollection getRef() {
return (ResourceCollection) getCheckedRef(
ResourceCollection.class, "ResourceCollection");
}
private synchronized void validate() {
dieOnCircularReference();
coll = (coll == null) ? new MyCollection() : coll;
}
private synchronized List getNested() {
return rc == null ? Collections.EMPTY_LIST : rc;
}
}
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