Struts example source code file (ShowValidatorAction.java)

This example Struts source code file (ShowValidatorAction.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

bean, class, error, illegalargumentexception, inject, javabean, object, object, propertydescriptor, propertyinfo, propertyinfo, string, string, unable, util, validator, validator

The Struts ShowValidatorAction.java source code

/*
 * $Id: ShowValidatorAction.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.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;

import com.opensymphony.xwork2.inject.Inject;
import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;
import com.opensymphony.xwork2.util.reflection.ReflectionContextFactory;
import com.opensymphony.xwork2.util.reflection.ReflectionException;
import com.opensymphony.xwork2.util.reflection.ReflectionProvider;
import com.opensymphony.xwork2.validator.Validator;

/**
 * ShowValidatorAction
 *
 */
public class ShowValidatorAction extends ListValidatorsAction {
    private static final long serialVersionUID = 4061534149317835177L;

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

    Set properties = Collections.EMPTY_SET;
    int selected = 0;
    
    ReflectionProvider reflectionProvider;
    ReflectionContextFactory reflectionContextFactory;

    @Inject
    public void setReflectionProvider(ReflectionProvider prov) {
        this.reflectionProvider = prov;
    }
    
    @Inject
    public void setReflectionContextFactory(ReflectionContextFactory fac) {
        this.reflectionContextFactory = fac;
    }
    
    public int getSelected() {
        return selected;
    }

    public void setSelected(int selected) {
        this.selected = selected;
    }

    public Set getProperties() {
        return properties;
    }

    public Validator getSelectedValidator() {
        return (Validator) validators.get(selected);
    }

    public String execute() throws Exception {
        loadValidators();
        Validator validator = getSelectedValidator();
        properties = new TreeSet();
        try {
            Map context = reflectionContextFactory.createDefaultContext(validator);
            BeanInfo beanInfoFrom = null;
            try {
                beanInfoFrom = Introspector.getBeanInfo(validator.getClass(), Object.class);
            } catch (IntrospectionException e) {
                LOG.error("An error occurred", e);
                addActionError("An error occurred while introspecting a validator of type " + validator.getClass().getName());
                return ERROR;
            }

            PropertyDescriptor[] pds = beanInfoFrom.getPropertyDescriptors();

            for (int i = 0; i < pds.length; i++) {
                PropertyDescriptor pd = pds[i];
                String name = pd.getName();
                Object value = null;
                if (pd.getReadMethod() == null) {
                    value = "No read method for property";
                } else {
                    try {
                        value = reflectionProvider.getValue(name, context, validator);
                    } catch (ReflectionException e) {
                        addActionError("Caught exception while getting property value for '" + name + "' on validator of type " + validator.getClass().getName());
                    }
                }
                properties.add(new PropertyInfo(name, pd.getPropertyType(), value));
            }
        } catch (Exception e) {
            LOG.warn("Unable to retrieve properties.", e);
            addActionError("Unable to retrieve properties: " + e.toString());
        }

        if (hasErrors())
            return ERROR;
        else
            return SUCCESS;
    }

    public static class PropertyInfo implements Comparable {
        private String name;
        private Class type;
        private Object value;

        public PropertyInfo(String name, Class type, Object value) {
            if (name == null) {
                throw new IllegalArgumentException("Name must not be null");
            }
            if (type == null) {
                throw new IllegalArgumentException("Type must not be null");
            }
            this.name = name;
            this.type = type;
            this.value = value;
        }

        public Class getType() {
            return type;
        }

        public void setType(Class type) {
            this.type = type;
        }

        public Object getValue() {
            return value;
        }

        public void setValue(Object value) {
            this.value = value;
        }

        public String getName() {
            return name;
        }

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

        public boolean equals(Object o) {
            if (this == o) return true;
            if (!(o instanceof PropertyInfo)) return false;

            final PropertyInfo propertyInfo = (PropertyInfo) o;

            if (!name.equals(propertyInfo.name)) return false;
            if (!type.equals(propertyInfo.type)) return false;
            if (value != null ? !value.equals(propertyInfo.value) : propertyInfo.value != null) return false;

            return true;
        }

        public int hashCode() {
            int result;
            result = name.hashCode();
            result = 29 * result + type.hashCode();
            result = 29 * result + (value != null ? value.hashCode() : 0);
            return result;
        }

        public int compareTo(Object o) {
            PropertyInfo other = (PropertyInfo) o;
            return this.name.compareTo(other.name);
        }
    }
}