dynaactionform.java

这是一个轻便的j2ee的web应用框架,是一个在多个项目中运用的实际框架,采用struts,hebinate,xml等技术,有丰富的tag,role,navigation,session,dictio

/*
 * $Header: /sfroot/cvs/esimple/src/core/org/apache/struts/action/DynaActionForm.java,v 1.1.1.1 2004/09/08 06:38:30 lava Exp $
 * $Revision: 1.1.1.1 $
 * $Date: 2004/09/08 06:38:30 $
 *
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999-2003 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", "Struts", 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 [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
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 *
 * 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
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 * 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.struts.action;


import java.lang.reflect.Array;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletRequest;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.beanutils.ConversionException;
import org.apache.commons.beanutils.DynaBean;
import org.apache.commons.beanutils.DynaClass;
import org.apache.commons.beanutils.DynaProperty;
import org.apache.struts.config.FormBeanConfig;
import org.apache.struts.config.FormPropertyConfig;


/**
 * <p>Specialized subclass of <code>ActionForm</code> that allows the creation
 * of form beans with dynamic sets of properties, without requiring the
 * developer to create a Java class for each type of form bean.</p>
 *
 * <p><strong>USAGE NOTE</strong> - Since Struts 1.1, the
 * <code>reset()</code> method no longer initializes property values to those
 * specified in <code>&lt;form-property&gt;</code> elements in the Struts
 * module configuration file.  If you wish to utilize that behavior, the
 * simplest solution is to subclass <code>DynaActionForm</code> and call
 * the <code>initialize()</code> method inside it.</p>
 *
 * @author Craig R. McClanahan
 * @version $Revision: 1.1.1.1 $ $Date: 2004/09/08 06:38:30 $
 * @since Struts 1.1
 */

public class DynaActionForm extends ActionForm implements DynaBean {


    // ----------------------------------------------------- Instance Variables


    /**
     * The DynaActionFormClass with which we are associated.
     */
    protected DynaActionFormClass dynaClass = null;


    /**
     * The set of property values for this DynaActionForm, keyed by
     * property name.
     */
    protected HashMap dynaValues = new HashMap();


    // ----------------------------------------------------- ActionForm Methods


    /**
     * <p>Initialize all bean properties to their initial values, as specified
     * in the {@link FormPropertyConfig} elements associated with the
     * definition of this <code>DynaActionForm</code>.</p>
     *
     * @param mapping The mapping used to select this instance
     *
     * @since Struts 1.1
     */
    public void initialize(ActionMapping mapping) {

        String name = mapping.getName();
        if (name == null) {
            return;
        }
        FormBeanConfig config =
            mapping.getModuleConfig().findFormBeanConfig(name);
        if (config == null) {
            return;
        }
        FormPropertyConfig props[] = config.findFormPropertyConfigs();
        for (int i = 0; i < props.length; i++) {
            set(props[i].getName(), props[i].initial());
        }

    }



    /**
     * <p>Reset all bean properties to their default state.  This method is
     * called before the properties are repopulated by the controller
     * servlet.</p>
     * 
     * <p>The default implementation attempts to forward to the HTTP
     * version of this method.</p>
     *
     * @param mapping The mapping used to select this instance
     * @param request The servlet request we are processing
     */
    public void reset(ActionMapping mapping, ServletRequest request) {

        try {
            reset(mapping, (HttpServletRequest) request);
        } catch (ClassCastException e) {
            ;
        }

    }


    /**
     * <p>Reset all bean properties to their default state.  This method is
     * called before the properties are repopulated by the controller servlet.
     * </p>
     * 
     * <p>The default implementation (since Struts 1.1) does nothing.
     * Subclasses may override this method to reset bean properties to
     * default values, or the <code>initialize()</code> method may be used to
     * initialize property values to those provided in the form property
     * configuration information (which was the previous behavior of
     * this method).</p>
     *
     * @param mapping The mapping used to select this instance
     * @param request The servlet request we are processing
     */
    public void reset(ActionMapping mapping, HttpServletRequest request) {

        ;       // Default implementation does nothing

    }


    // ------------------------------------------------------- DynaBean Methods


    /**
     * Indicates if the specified mapped property contain a value for the specified
     * key value.
     *
     * @param name Name of the property to check
     * @param key Name of the key to check
     *
     * @exception IllegalArgumentException if there is no property
     *  of the specified name
     */
    public boolean contains(String name, String key) {

        Object value = dynaValues.get(name);
        if (value == null) {
            throw new NullPointerException
                ("No mapped value for '" + name + "(" + key + ")'");
        } else if (value instanceof Map) {
            return (((Map) value).containsKey(key));
        } else {
            throw new IllegalArgumentException
                ("Non-mapped property for '" + name + "(" + key + ")'");
        }

    }


    /**
     * Return the value of a simple property with the specified name.
     *
     * @param name Name of the property whose value is to be retrieved
     *
     * @exception IllegalArgumentException if there is no property
     *  of the specified name
     * @exception NullPointerException if the type specified for the
     *  property is invalid
     */
    public Object get(String name) {

        // Return any non-null value for the specified property
        Object value = dynaValues.get(name);
        if (value != null) {
            return (value);
        } 

        // Return a null value for a non-primitive property
        Class type = getDynaProperty(name).getType();
        if (type == null) {
            throw new NullPointerException
                ("The type for property " + name + " is invalid");
        }
        if (!type.isPrimitive()) {
            return (value);
        }

        // Manufacture default values for primitive properties
        if (type == Boolean.TYPE) {
            return (Boolean.FALSE);
        } else if (type == Byte.TYPE) {
            return (new Byte((byte) 0));
        } else if (type == Character.TYPE) {
            return (new Character((char) 0));
        } else if (type == Double.TYPE) {
            return (new Double((double) 0.0));
        } else if (type == Float.TYPE) {
            return (new Float((float) 0.0));
        } else if (type == Integer.TYPE) {
            return (new Integer((int) 0));
        } else if (type == Long.TYPE) {
            return (new Long((int) 0));
        } else if (type == Short.TYPE) {
            return (new Short((short) 0));
        } else {
            return (null);
        }

    }


    /**
     * Return the value of an indexed property with the specified name.
     *
     * @param name Name of the property whose value is to be retrieved
     * @param index Index of the value to be retrieved
     *
     * @exception IllegalArgumentException if there is no property
     *  of the specified name
     * @exception IllegalArgumentException if the specified property
     *  exists, but is not indexed
     * @exception IndexOutOfBoundsException if the specified index
     *  is outside the range of the underlying property
     * @exception NullPointerException if no array or List has been
     *  initialized for this property
     */
    public Object get(String name, int index) {

        Object value = dynaValues.get(name);
        if (value == null) {
            throw new NullPointerException
                ("No indexed value for '" + name + "[" + index + "]'");
        } else if (value.getClass().isArray()) {
            return (Array.get(value, index));
        } else if (value instanceof List) {
            return ((List) value).get(index);
        } else {
            throw new IllegalArgumentException
                ("Non-indexed property for '" + name + "[" + index + "]'");
        }

    }


    /**
     * Return the value of a mapped property with the specified name,
     * or <code>null</code> if there is no value for the specified key.
     *
     * @param name Name of the property whose value is to be retrieved
     * @param key Key of the value to be retrieved
     *
     * @exception IllegalArgumentException if there is no property
     *  of the specified name
     * @exception IllegalArgumentException if the specified property