/** *   SetCommand.java *   Copyright 2005 Carlos Silva A. *  *   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 jgantt.cmds;import java.lang.reflect.Method;import java.text.MessageFormat;import java.util.Date;import jgantt.model.Task;/** * SetCommand represents a command that executes a setter for an object. Uses * reflextion to invoke the method with diferent attributes. Usage:new * SetCommand(Object, "setMethod", executeValue, undoValue)); * <p> * $Date: 2005/07/14 06:16:04 $ * </p> *  * @version $Revision: 1.4 $ * @author Carlos Silva */public class SetCommand implements Command {    String setter;    Class[] argType;    Object oldValue;    Object newValue;    Object object;    private SetCommand(Object object, String setter) {        this.object = object;        this.setter = setter;    }    /**     * Asignador de String     */    public SetCommand(Object object, String setter, String newVal, String oldVal) {        this.object = object;        argType = new Class[] { String.class };        this.newValue = newVal;        this.oldValue = oldVal;    }    /**     * Asignador de int     */    public SetCommand(Task task, String setter, int newValue, int oldValue) {        this(task, setter);        argType = new Class[] { Integer.TYPE };        this.newValue = new Integer(newValue);        this.oldValue = new Integer(oldValue);    }    /**     * Asignador de boolean     *      * @param task     * @param setter     * @param newValue     * @param oldValue     */    public SetCommand(Task task, String setter, boolean newV, boolean oldV) {        this(task, setter);        argType = new Class[] { Boolean.TYPE };        this.newValue = new Boolean(newV);        this.oldValue = new Boolean(oldV);    }    /**     * Asignador de boolean     *      * @param task     * @param setter     * @param newValue     * @param oldValue     */    public SetCommand(Task task, String setter, Date newV, Date oldV) {        this(task, setter);        argType = new Class[] { Boolean.TYPE };        this.newValue = newV;        this.oldValue = oldV;    }    /**     * @see jgantt.cmds.TaskCommand#execute()     */    public void execute() {        invoke(newValue);    }    /**     * @see jgantt.cmds.TaskCommand#undo()     */    public void undo() {        invoke(oldValue);    }    void invoke(Object value) {        try {            Method method = object.getClass().getMethod(setter, argType);            method.invoke(object, new Object[] { value });        } catch (Exception e) {            Object a[] = new Object[] { setter, argType[0], value };            String spec = MessageFormat.format("invoke ${0}(${1}, ${2})", a);            System.err.println(spec);            e.printStackTrace();        }    }}