Struts example source code file (OptGroup.java)

This example Struts source code file (OptGroup.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 - Struts tags/keywords

http, httpservletrequest, httpservletresponse, io, list, listuibean, logger, optgroup, optgroup, request, response, select, select, servlet, set, set, string, strutstagattribute, strutstagattribute, util

The Struts OptGroup.java source code

/*
 * $Id: OptGroup.java 651946 2008-04-27 13:41:38Z apetrelli $
 *
 * 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.struts2.components;

import java.io.Writer;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.views.annotations.StrutsTag;
import org.apache.struts2.views.annotations.StrutsTagAttribute;

import com.opensymphony.xwork2.inject.Container;
import com.opensymphony.xwork2.inject.Inject;
import com.opensymphony.xwork2.util.ValueStack;
import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;

/**
 * <!-- START SNIPPET: javadoc -->
 *
 * Create a optgroup component which needs to resides within a select tag.
 *
 * <!-- END SNIPPET: javadoc -->
 *
 * <p/>
 *
 * <!-- START SNIPPET: notice -->
 *
 * This component is to be used within a  Select component.
 *
 * <!-- END SNIPPET: notice -->
 *
 * <p/>
 *
 * <pre>
 * <!-- START SNIPPET: example -->
 *
 * <s:select label="My Selection"
 *            name="mySelection"
 *            value="%{'POPEYE'}"
 *            list="%{#{'SUPERMAN':'Superman', 'SPIDERMAN':'spiderman'}}">
 *    <s:optgroup label="Adult"
 *                 list="%{#{'SOUTH_PARK':'South Park'}}" />
 *    <s:optgroup label="Japanese"
 *                 list="%{#{'POKEMON':'pokemon','DIGIMON':'digimon','SAILORMOON':'Sailormoon'}}" />
 * </s:select>
 *
 * <!-- END SNIPPET: example -->
 * </pre>
 *
 */
@StrutsTag(
    name="optgroup",
    tldTagClass="org.apache.struts2.views.jsp.ui.OptGroupTag",
    description="Renders a Select Tag's OptGroup Tag")
public class OptGroup extends Component {

    public static final String INTERNAL_LIST_UI_BEAN_LIST_PARAMETER_KEY = "optGroupInternalListUiBeanList";

    private static Logger LOG = LoggerFactory.getLogger(OptGroup.class);

    protected HttpServletRequest req;
    protected HttpServletResponse res;

    protected ListUIBean internalUiBean;

    public OptGroup(ValueStack stack, HttpServletRequest req, HttpServletResponse res) {
        super(stack);
        this.req = req;
        this.res = res;
        internalUiBean = new ListUIBean(stack, req, res) {
            protected String getDefaultTemplate() {
                return "empty";
            }
        };
    }
    
    @Inject
    public void setContainer(Container container) {
        container.inject(internalUiBean);
    }

    public boolean end(Writer writer, String body) {
        Select select = (Select) findAncestor(Select.class);
        if (select == null) {
            LOG.error("incorrect use of OptGroup component, this component must be used within a Select component",
                    new IllegalStateException("incorrect use of OptGroup component, this component must be used within a Select component"));
            return false;
        }
        internalUiBean.start(writer);
        internalUiBean.end(writer, body);

        List listUiBeans = (List) select.getParameters().get(INTERNAL_LIST_UI_BEAN_LIST_PARAMETER_KEY);
        if (listUiBeans == null) {
            listUiBeans = new ArrayList();
        }
        listUiBeans.add(internalUiBean);
        select.addParameter(INTERNAL_LIST_UI_BEAN_LIST_PARAMETER_KEY, listUiBeans);

        return false;
    }

    @StrutsTagAttribute(description="Set the label attribute")
    public void setLabel(String label) {
        internalUiBean.setLabel(label);
    }

    @StrutsTagAttribute(description="Set the disable attribute.")
    public void setDisabled(String disabled) {
        internalUiBean.setDisabled(disabled);
    }

    @StrutsTagAttribute(description="Set the list attribute.")
    public void setList(String list) {
        internalUiBean.setList(list);
    }

    @StrutsTagAttribute(description="Set the listKey attribute.")
    public void setListKey(String listKey) {
        internalUiBean.setListKey(listKey);
    }

    @StrutsTagAttribute(description="Set the listValue attribute.")
    public void setListValue(String listValue) {
        internalUiBean.setListValue(listValue);
    }
}