src/main/org/apache/tools/ant/types/AntFilterReader.java

/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Ant", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
package org.apache.tools.ant.types;

import org.apache.tools.ant.BuildException;
import java.util.Vector;

/**
 * An AntFileReader is a wrapper class that encloses the classname
 * and configuration of a Configurable FilterReader.
 *
 * @author <a href="mailto:umagesh@apache.org">Magesh Umasankar</a>
 */
public final class AntFilterReader
    extends DataType
    implements Cloneable {

    private String className;

    private final Vector parameters = new Vector();

    private Path classpath;

    public final void setClassName(final String className) {
        this.className = className;
    }

    public final String getClassName() {
        return className;
    }

    public final void addParam(final Parameter param) {
        parameters.addElement(param);
    }

    /**
     * Set the classpath to load the FilterReader through (attribute).
     */
    public final void setClasspath(Path classpath) {
        if (isReference()) {
            throw tooManyAttributes();
        }
        if (this.classpath == null) {
            this.classpath = classpath;
        } else {
            this.classpath.append(classpath);
        }
    }

    /**
     * Set the classpath to load the FilterReader through (nested element).
     */
    public final Path createClasspath() {
        if (isReference()) {
            throw noChildrenAllowed();
        }
        if (this.classpath == null) {
            this.classpath = new Path(getProject());
        }
        return this.classpath.createPath();
    }

    /**
     * Get the classpath
     */
    public final Path getClasspath() {
        return classpath;
    }

    /**
     * Set the classpath to load the FilterReader through via
     * reference (attribute).
     */
    public void setClasspathRef(Reference r) {
        if (isReference()) {
            throw tooManyAttributes();
        }
        createClasspath().setRefid(r);
    }

    public final Parameter[] getParams() {
        Parameter[] params = new Parameter[parameters.size()];
        parameters.copyInto(params);
        return params;
    }

    /**
     * Makes this instance in effect a reference to another AntFilterReader 
     * instance.
     *
     * <p>You must not set another attribute or nest elements inside
     * this element if you make it a reference.</p>
     *
     * @param r the reference to which this instance is associated
     * @exception BuildException if this instance already has been configured.
     */
    public void setRefid(Reference r) throws BuildException {
        if (!parameters.isEmpty() || className != null
                || classpath != null) {
            throw tooManyAttributes();
        }
        // change this to get the objects from the other reference
        Object o = r.getReferencedObject(getProject());
        if (o instanceof AntFilterReader) {
            AntFilterReader afr = (AntFilterReader) o;
            setClassName(afr.getClassName());
            setClasspath(afr.getClasspath());
            Parameter[] p = afr.getParams();
            if (p != null) {
                for (int i = 0; i < p.length; i++) {
                    addParam(p[i]);
                }
            }
        } else {
            String msg = r.getRefId() + " doesn\'t refer to a FilterReader";
            throw new BuildException(msg);
        }

        super.setRefid(r);
    }
}