Struts example source code file (ShowBeansAction.java)

This example Struts source code file (ShowBeansAction.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

actionnamesaction, binding, binding, class, class, comparable, inject, map, object, set, set, string, string, treemap, util

The Struts ShowBeansAction.java source code

/*
 * $Id: ShowBeansAction.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.config_browser;

import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import java.util.TreeSet;

import org.apache.struts2.StrutsConstants;
import org.apache.struts2.components.UrlRenderer;
import org.apache.struts2.dispatcher.mapper.ActionMapper;
import org.apache.struts2.dispatcher.multipart.MultiPartRequest;
import org.apache.struts2.views.freemarker.FreemarkerManager;
import org.apache.struts2.views.velocity.VelocityManager;

import com.opensymphony.xwork2.ActionProxyFactory;
import com.opensymphony.xwork2.ObjectFactory;
import com.opensymphony.xwork2.TextProvider;
import com.opensymphony.xwork2.conversion.ObjectTypeDeterminer;
import com.opensymphony.xwork2.conversion.impl.XWorkConverter;
import com.opensymphony.xwork2.inject.Container;
import com.opensymphony.xwork2.inject.Inject;

/**
 * Shows the beans loaded by the internal Guice container.  Only shows beans that are recognized by Struts as official
 * plugin extension points.
 */
public class ShowBeansAction extends ActionNamesAction {

    Map<String,Set bindings;

    @Inject
    public void setContainer(Container container) {
        bindings = new TreeMap<String,Set();
        bindings.put(ObjectFactory.class.getName(), addBindings(container, ObjectFactory.class, StrutsConstants.STRUTS_OBJECTFACTORY));
        bindings.put(XWorkConverter.class.getName(), addBindings(container, XWorkConverter.class, StrutsConstants.STRUTS_XWORKCONVERTER));
        bindings.put(TextProvider.class.getName(), addBindings(container, TextProvider.class, StrutsConstants.STRUTS_XWORKTEXTPROVIDER));
        bindings.put(ActionProxyFactory.class.getName(), addBindings(container, ActionProxyFactory.class, StrutsConstants.STRUTS_ACTIONPROXYFACTORY));
        bindings.put(ObjectTypeDeterminer.class.getName(), addBindings(container, ObjectTypeDeterminer.class, StrutsConstants.STRUTS_OBJECTTYPEDETERMINER));
        bindings.put(ActionMapper.class.getName(), addBindings(container, ActionMapper.class, StrutsConstants.STRUTS_MAPPER_CLASS));
        bindings.put(MultiPartRequest.class.getName(), addBindings(container, MultiPartRequest.class, StrutsConstants.STRUTS_MULTIPART_PARSER));
        bindings.put(FreemarkerManager.class.getName(), addBindings(container, FreemarkerManager.class, StrutsConstants.STRUTS_FREEMARKER_MANAGER_CLASSNAME));
        bindings.put(VelocityManager.class.getName(), addBindings(container, VelocityManager.class, StrutsConstants.STRUTS_VELOCITY_MANAGER_CLASSNAME));
        bindings.put(UrlRenderer.class.getName(), addBindings(container, UrlRenderer.class, StrutsConstants.STRUTS_URL_RENDERER));
    }
    
    public Map<String, Set getBeans()
    {
        return bindings;
    }
    
    protected Set<Binding> addBindings(Container container, Class type, String constName) {
        Set<Binding> bindings = new TreeSet();
        String chosenName = container.getInstance(String.class, constName);
        if (chosenName == null) {
            chosenName = "struts";
        }
        Set<String> names = container.getInstanceNames(type);
        if (!names.contains(chosenName)) {
            bindings.add(new Binding(getInstanceClassName(container, type, "default"), chosenName, constName, true));
        }
        for (String name : names) {
            if (!"default".equals(name)) {
                bindings.add(new Binding(getInstanceClassName(container, type, name), name, constName, name.equals(chosenName)));
            }
        }
        return bindings;
    }

    String getInstanceClassName(Container container, Class type, String name) {
        String instName = "Class unable to be loaded";
        try {
            Object inst = container.getInstance(type, name);
            instName = inst.getClass().getName();
        } catch (Exception ex) {
            // Ignoring beans unable to be loaded
        }
        return instName;
    }
    
    public class Binding implements Comparable<Binding> {
        private String impl;
        private String alias;
        private String constant;
        private boolean isDefault;
        
        public Binding(String impl, String alias, String constant, boolean def) {
            this.impl = impl;
            this.alias = alias;
            this.constant = constant;
            this.isDefault = def;
        }
        public String getImpl() {
            return impl;
        }
        public String getAlias() {
            return alias;
        }
        public String getConstant() {
            return constant;
        }
        
        public boolean isDefault() {
            return isDefault;
        }
        
        public int compareTo(Binding b2) {
            int ret = 0;
            if (isDefault) {
                ret = -1;
            } else if (b2.isDefault()) {
                ret = 1;
            } else {
                ret = alias.compareTo(b2.getAlias());
            }
            return ret;
        }
    }
}