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/*
 * Copyright  2003-2004 The Apache Software Foundation
 *
 *  Licensed 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.taskdefs;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.ProjectHelper;
import org.apache.tools.ant.Task;

/**
 * Base class for tasks that that can be used in antlibs.
 * For handling uri and class loading.
 *
 *
 * @since Ant 1.6
 */
public class AntlibDefinition extends Task {

    private String uri = "";
    private ClassLoader antlibClassLoader;

    /**
     * The URI for this definition.
     * If the URI is "antlib:org.apache.tools.ant",
     * (this is the default uri)
     * the uri will be set to "".
     * URIs that start with "ant:" are reserved
     * and are not allowed in this context.
     * @param uri the namespace URI
     * @throws BuildException if a reserved URI is used
     */
    public void setURI(String uri) throws BuildException {
        if (uri.equals(ProjectHelper.ANT_CORE_URI)) {
            uri = "";
        }
        if (uri.startsWith("ant:")) {
            throw new BuildException("Attempt to use a reserved URI " + uri);
        }
        this.uri = uri;
    }

    /**
     * The URI for this definition.
     * @return The URI for this defintion.
     */
    public String getURI() {
        return uri;
    }

    /**
     * Set the class loader of the loading object
     *
     * @param classLoader a ClassLoader value
     */
    public void setAntlibClassLoader(ClassLoader classLoader) {
        this.antlibClassLoader = classLoader;
    }

    /**
     * The current antlib classloader
     * @return the antlib classloader for the definition, this
     *         is null if the definition is not used in an antlib.
     */
    public ClassLoader getAntlibClassLoader() {
        return antlibClassLoader;
    }
}