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Ant example source code file (Tokens.java)

This example Ant source code file (Tokens.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Ant tags/keywords

arraylist, arraylist, baseresourcecollectionwrapper, buildexception, buildexception, concatresourceinputstream, inputstreamreader, inputstreamreader, io, only, project, resourcecollection, string, string, tokenizer, util

The Tokens.java source code

/*
 *  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.InputStreamReader;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Stack;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;

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;
import org.apache.tools.ant.util.ConcatResourceInputStream;
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 getCollection() {
        ResourceCollection rc = getResourceCollection();
        if (rc.size() == 0) {
            return Collections.EMPTY_SET;
        }
        if (tokenizer == null) {
            tokenizer = new LineTokenizer();
        }
        ConcatResourceInputStream cat = new ConcatResourceInputStream(rc);
        cat.setManagingComponent(this);

        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 result = new ArrayList();
        try {
            for (String s = tokenizer.getToken(rdr); s != null; s = tokenizer.getToken(rdr)) {
                result.add(new StringResource(s));
            }
        } catch (IOException e) {
            throw new BuildException("Error reading tokens", e);
        }
        return result;
    }

    /**
     * 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;
    }

    /**
     * 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 stk, Project p)
        throws BuildException {
        if (isChecked()) {
            return;
        }
        if (isReference()) {
            super.dieOnCircularReference(stk, p);
        } else {
            if (tokenizer instanceof DataType) {
                stk.push(tokenizer);
                invokeCircularReferenceCheck((DataType) tokenizer, stk, p);
            }
            setChecked(true);
        }
    }

}

Other Ant examples (source code examples)

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