optionstag.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/com/esimple/framework/web/taglib/html/OptionsTag.java,v 1.1.1.1 2004/09/08 06:38:18 lava Exp $
 * $Revision: 1.1.1.1 $
 * $Date: 2004/09/08 06:38:18 $
 * 
 * ====================================================================
 *
 * 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
 *    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 com.esimple.framework.web.taglib.html;

import java.lang.reflect.InvocationTargetException;
import java.util.Arrays;
import java.util.Collection;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Map;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;

import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.collections.IteratorUtils;
import org.apache.struts.util.MessageResources;
import org.apache.struts.util.RequestUtils;
import org.apache.struts.util.ResponseUtils;

/**
 * Tag for creating multiple &lt;select&gt; options from a collection.  The
 * associated values displayed to the user may optionally be specified by a
 * second collection, or will be the same as the values themselves.  Each
 * collection may be an array of objects, a Collection, an Enumeration,
 * an Iterator, or a Map.
 * <b>NOTE</b> - This tag requires a Java2 (JDK 1.2 or later) platform.
 *
 * @author Florent Carpentier
 * @author Craig McClanahan
 */

public class OptionsTag extends TagSupport {

    /**
     * The message resources for this package.
     */
    protected static MessageResources messages =
        MessageResources.getMessageResources(Constants.Package + ".LocalStrings");

    /**
     * The name of the collection containing beans that have properties to
     * provide both the values and the labels (identified by the
     * <code>property</code> and <code>labelProperty</code> attributes).
     */
    protected String collection = null;

    public String getCollection() {
        return (this.collection);
    }

    public void setCollection(String collection) {
        this.collection = collection;
    }

    /**
     * Should the label values be filtered for HTML sensitive characters?
     */
    protected boolean filter = true;

    public boolean getFilter() {
        return filter;
    }

    public void setFilter(boolean filter) {
        this.filter = filter;
    }

    /**
     * The name of the bean containing the labels collection.
     */
    protected String labelName = null;

    public String getLabelName() {
        return labelName;
    }

    public void setLabelName(String labelName) {
        this.labelName = labelName;
    }

    /**
     * The bean property containing the labels collection.
     */
    protected String labelProperty = null;

    public String getLabelProperty() {
        return labelProperty;
    }

    public void setLabelProperty(String labelProperty) {
        this.labelProperty = labelProperty;
    }

    /**
     * The name of the bean containing the values collection.
     */
    protected String name = null;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    /**
     * The name of the property to use to build the values collection.
     */
    protected String property = null;

    public String getProperty() {
        return property;
    }

    public void setProperty(String property) {
        this.property = property;
    }

    /**
     * The style associated with this tag.
     */
    private String style = null;

    public String getStyle() {
        return style;
    }

    public void setStyle(String style) {
        this.style = style;
    }

    /**
     * The named style class associated with this tag.
     */
    private String styleClass = null;

    public String getStyleClass() {
        return styleClass;
    }

    public void setStyleClass(String styleClass) {
        this.styleClass = styleClass;
    }

    /**
     * Process the start of this tag.
     *
     * @exception JspException if a JSP exception has occurred
     */

    public int doStartTag() throws JspException {
        return SKIP_BODY;
    }

    /**
     * Process the end of this tag.
     *
     * @exception JspException if a JSP exception has occurred
     */
    public int doEndTag() throws JspException {

        // Acquire the select tag we are associated with
        SelectTag selectTag = (SelectTag) pageContext.getAttribute(Constants.SELECT_KEY);
        if (selectTag == null) {
            throw new JspException(messages.getMessage("optionsTag.select"));
        }