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Struts example source code file (ActionError.java)

This example Struts source code file (ActionError.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

actionerror, actionerror, boolean, collection, html, http, list, render, request, response, servlet, string, string, strutstag, template, template, uibean, uibean, util

The Struts ActionError.java source code

/*
 * $Id: ActionError.java 1076544 2011-03-03 07:19:37Z lukaszlenart $
 *
 * 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 com.opensymphony.xwork2.util.ValueStack;
import org.apache.commons.lang.StringUtils;
import org.apache.struts2.views.annotations.StrutsTag;
import org.apache.struts2.views.annotations.StrutsTagAttribute;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Collection;
import java.util.List;

/**
 * <!-- START SNIPPET: javadoc -->
 *
 * Render action errors if they exists the specific layout of the rendering depends on
 * the theme itself. Empty (null or blank string) errors will not be printed. The action error
 * strings will be html escaped by default.
 *
 * <!-- END SNIPPET: javadoc -->
 *
 * <p/> Examples
 *
 * <pre>
 * <!-- START SNIPPET: example -->
 *
 *    <s:actionerror />
 *    <s:form .... >
 *       ....
 *    </s:form>
 *
 * <!-- END SNIPPET: example -->
 * </pre>
 *
 */
@StrutsTag(name="actionerror", tldBodyContent="empty", tldTagClass="org.apache.struts2.views.jsp.ui.ActionErrorTag", description="Render action errors if they exists")
public class ActionError extends UIBean {

    public static final String TEMPLATE = "actionerror";
    private boolean escape = true;

    public ActionError(ValueStack stack, HttpServletRequest request, HttpServletResponse response) {
        super(stack, request, response);
    }

    protected String getDefaultTemplate() {
        return TEMPLATE;
    }

    protected void evaluateExtraParams() {
        boolean isEmptyList = true;
        Collection<String> actionMessages = (List) findValue("actionErrors");
        if (actionMessages != null) {
            for (String message : actionMessages) {
                if (StringUtils.isNotBlank(message)) {
                    isEmptyList = false;
                    break;
                }
            }
        }

        addParameter("isEmptyList", isEmptyList);
        addParameter("escape", escape);
    }

    @StrutsTagAttribute(description=" Whether to escape HTML", type="Boolean", defaultValue="true")
    public void setEscape(boolean escape) {
        this.escape = escape;
    }
}

Other Struts examples (source code examples)

Here is a short list of links related to this Struts ActionError.java source code file:

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