Ant example source code file (ScriptDefBase.java)

This example Ant source code file (ScriptDefBase.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, buildexception, buildexception, hashmap, list, map, map, object, script, scriptdef, scriptdef, string, string, task, util

The ScriptDefBase.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.taskdefs.optional.script;

import org.apache.tools.ant.Task;
import org.apache.tools.ant.MagicNames;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.DynamicConfigurator;
import java.util.Map;
import java.util.HashMap;
import java.util.List;
import java.util.ArrayList;

/**
 * The script execution class. This class finds the defining script task
 * and passes control to that task's executeScript method.
 *
 * @since Ant 1.6
 */
public class ScriptDefBase extends Task implements DynamicConfigurator {

    /** Nested elements */
    private Map nestedElementMap = new HashMap();

    /** Attributes */
    private Map attributes = new HashMap();

    private String text;

    /**
     * Locate the script defining task and execute the script by passing
     * control to it
     */
    public void execute() {
        getScript().executeScript(attributes, nestedElementMap, this);
    }

    private ScriptDef getScript() {
        String name = getTaskType();
        Map scriptRepository
            = (Map) getProject().getReference(MagicNames.SCRIPT_REPOSITORY);
        if (scriptRepository == null) {
            throw new BuildException("Script repository not found for " + name);
        }

        ScriptDef definition = (ScriptDef) scriptRepository.get(getTaskType());
        if (definition == null) {
            throw new BuildException("Script definition not found for " + name);
        }
        return definition;
    }

    /**
     * Create a nested element
     *
     * @param name the nested element name
     * @return the element to be configured
     */
    public Object createDynamicElement(String name)  {
        List nestedElementList = (List) nestedElementMap.get(name);
        if (nestedElementList == null) {
            nestedElementList = new ArrayList();
            nestedElementMap.put(name, nestedElementList);
        }
        Object element = getScript().createNestedElement(name);
        nestedElementList.add(element);
        return element;
    }

    /**
     * Set a task attribute
     *
     * @param name the attribute name.
     * @param value the attribute's string value
     */
    public void setDynamicAttribute(String name, String value) {
        ScriptDef definition = getScript();
        if (!definition.isAttributeSupported(name)) {
                throw new BuildException("<" + getTaskType()
                    + "> does not support the \"" + name + "\" attribute");
        }

        attributes.put(name, value);
    }

    /**
     * Set the script text.
     *
     * @param text a component of the script text to be added.
     * @since ant1.7
     */
    public void addText(String text) {
        this.text = getProject().replaceProperties(text);
    }

    /**
     * get the text of this element; may be null
     * @return text or null for no nested text
     * @since ant1.7
     */
    public String getText() {
        return text;
    }

    /**
     * Utility method for nested scripts; throws a BuildException
     * with the given message.
     * @param message text to pass to the BuildException
     * @throws BuildException always.
     * @since ant1.7
     */
    public void fail(String message) {
        throw new BuildException(message);
    }
}