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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.resources;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
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.Resource;
import org.apache.tools.ant.types.ResourceCollection;
import org.apache.tools.ant.util.ConcatResourceInputStream;
import org.apache.tools.ant.util.FileUtils;
import org.apache.tools.ant.util.LineTokenizer;
import org.apache.tools.ant.util.Tokenizer;
/**
* ResourceCollection consisting of StringResources gathered from tokenizing
* another ResourceCollection with a Tokenizer implementation.
* @since Ant 1.7
*/
public class Tokens extends BaseResourceCollectionWrapper {
private Tokenizer tokenizer;
private String encoding;
/**
* Sort the contained elements.
* @return a Collection of Resources.
*/
protected synchronized Collection<Resource> getCollection() {
ResourceCollection rc = getResourceCollection();
if (rc.size() == 0) {
return Collections.emptySet();
}
if (tokenizer == null) {
tokenizer = new LineTokenizer();
}
ConcatResourceInputStream cat = new ConcatResourceInputStream(rc);
cat.setManagingComponent(this);
try {
InputStreamReader rdr = null;
if (encoding == null) {
rdr = new InputStreamReader(cat);
} else {
try {
rdr = new InputStreamReader(cat, encoding);
} catch (UnsupportedEncodingException e) {
throw new BuildException(e);
}
}
ArrayList<Resource> result = new ArrayList<Resource>();
for (String s = tokenizer.getToken(rdr); s != null; s = tokenizer.getToken(rdr)) {
StringResource resource = new StringResource(s);
resource.setProject(getProject());
result.add(resource);
}
return result;
} catch (IOException e) {
throw new BuildException("Error reading tokens", e);
} finally {
FileUtils.close(cat);
}
}
/**
* Set the encoding used to create the tokens.
* @param encoding the encoding to use.
*/
public synchronized void setEncoding(String encoding) {
this.encoding = encoding;
}
/**
* Add the nested Tokenizer to this Tokens ResourceCollection.
* A LineTokenizer will be used by default.
* @param tokenizer the tokenizer to add.
*/
public synchronized void add(Tokenizer tokenizer) {
if (isReference()) {
throw noChildrenAllowed();
}
if (this.tokenizer != null) {
throw new BuildException("Only one nested tokenizer allowed.");
}
this.tokenizer = tokenizer;
setChecked(false);
}
/**
* Overrides the BaseResourceCollectionContainer version
* to check the nested Tokenizer.
* @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<Object> stk, Project p)
throws BuildException {
if (isChecked()) {
return;
}
// check nested collection
super.dieOnCircularReference(stk, p);
if (!isReference()) {
if (tokenizer instanceof DataType) {
pushAndInvokeCircularReferenceCheck((DataType) tokenizer, stk,
p);
}
setChecked(true);
}
}
}
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