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/*
* Copyright 2008 biaoping.yin
*
* Licensed 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.frameworkset.web.servlet;
import java.util.Map;
import org.frameworkset.spi.support.validate.Errors;
import org.frameworkset.web.servlet.view.View;
/**
* Title: ModelAndView.java
* Description:
* bboss workgroup
* Copyright (c) 2008
* @Date 2010-9-23
* @author biaoping.yin
* @version 1.0
*/
public class ModelAndView {
/** View instance or view name String */
private Object view;
/** Model Map */
private ModelMap model;
private ModelMap errorModel;
/**
* Indicates whether or not this instance has been cleared with a call to {@link #clear()}.
*/
private boolean cleared;
/**
* Default constructor for bean-style usage: populating bean
* properties instead of passing in constructor arguments.
* @see #setView(View)
* @see #setViewName(String)
*/
public ModelAndView() {
}
/**
* Convenient constructor when there is no model data to expose.
* Can also be used in conjunction with addObject.
* @param viewName name of the View to render, to be resolved
* by the DispatcherServlet's ViewResolver
* @see #addObject
*/
public ModelAndView(String viewName) {
this.view = viewName;
}
/**
* Convenient constructor when there is no model data to expose.
* Can also be used in conjunction with addObject.
* @param view View object to render
* @see #addObject
*/
public ModelAndView(View view) {
this.view = view;
}
/**
* Creates new ModelAndView given a view name and a model.
* @param viewName name of the View to render, to be resolved
* by the DispatcherServlet's ViewResolver
* @param model Map of model names (Strings) to model objects
* (Objects). Model entries may not be null, but the
* model Map may be null if there is no model data.
*/
public ModelAndView(String viewName, Map model) {
this.view = viewName;
if (model != null) {
getModelMap().addAllAttributes(model);
}
}
/**
* Creates new ModelAndView given a View object and a model.
* Note: the supplied model data is copied into the internal
* storage of this class. You should not consider to modify the supplied
* Map after supplying it to this class
* @param view View object to render
* @param model Map of model names (Strings) to model objects
* (Objects). Model entries may not be null, but the
* model Map may be null if there is no model data.
*/
public ModelAndView(View view, Map model) {
this.view = view;
if (model != null) {
getModelMap().addAllAttributes(model);
}
}
/**
* Convenient constructor to take a single model object.
* @param viewName name of the View to render, to be resolved
* by the DispatcherServlet's ViewResolver
* @param modelName name of the single entry in the model
* @param modelObject the single model object
*/
public ModelAndView(String viewName, String modelName, Object modelObject) {
this.view = viewName;
addObject(modelName, modelObject);
}
/**
* Convenient constructor to take a single model object.
* @param view View object to render
* @param modelName name of the single entry in the model
* @param modelObject the single model object
*/
public ModelAndView(View view, String modelName, Object modelObject) {
this.view = view;
addObject(modelName, modelObject);
}
/**
* Set a view name for this ModelAndView, to be resolved by the
* DispatcherServlet via a ViewResolver. Will override any
* pre-existing view name or View.
*/
public void setViewName(String viewName) {
this.view = viewName;
}
/**
* Return the view name to be resolved by the DispatcherServlet
* via a ViewResolver, or null if we are using a View object.
*/
public String getViewName() {
return (this.view instanceof String ? (String) this.view : null);
}
/**
* Set a View object for this ModelAndView. Will override any
* pre-existing view name or View.
*/
public void setView(View view) {
this.view = view;
}
/**
* Return the View object, or null if we are using a view name
* to be resolved by the DispatcherServlet via a ViewResolver.
*/
public View getView() {
return (this.view instanceof View ? (View) this.view : null);
}
/**
* Indicate whether or not this ModelAndView has a view, either
* as a view name or as a direct {@link View} instance.
*/
public boolean hasView() {
return (this.view != null);
}
/**
* Return whether we use a view reference, i.e. true
* if the view has been specified via a name to be resolved by the
* DispatcherServlet via a ViewResolver.
*/
public boolean isReference() {
return (this.view instanceof String);
}
/**
* Return the model map. May return null.
* Called by DispatcherServlet for evaluation of the model.
*/
protected Map getModelInternal() {
return this.model;
}
/**
* Return the underlying ModelMap instance (never null).
*/
public ModelMap getModelMap() {
if (this.model == null) {
this.model = new ModelMap();
}
return this.model;
}
/**
* Return the model map. Never returns null.
* To be called by application code for modifying the model.
*/
public Map getModel() {
return getModelMap();
}
/**
* Add an attribute to the model.
* @param attributeName name of the object to add to the model
* @param attributeValue object to add to the model (never null)
* @see ModelMap#addAttribute(String, Object)
* @see #getModelMap()
*/
public ModelAndView addObject(String attributeName, Object attributeValue) {
getModelMap().addAttribute(attributeName, attributeValue);
return this;
}
/**
* Add an attribute to the model using parameter name generation.
* @param attributeValue the object to add to the model (never null)
* @see ModelMap#addAttribute(Object)
* @see #getModelMap()
*/
public ModelAndView addObject(Object attributeValue) {
getModelMap().addAttribute(attributeValue);
return this;
}
/**
* Add all attributes contained in the provided Map to the model.
* @param modelMap a Map of attributeName -> attributeValue pairs
* @see ModelMap#addAllAttributes(Map)
* @see #getModelMap()
*/
public ModelAndView addAllObjects(Map modelMap) {
getModelMap().addAllAttributes(modelMap);
if(modelMap instanceof ModelMap)
{
getModelMap().addErrors((ModelMap)modelMap);
}
return this;
}
/**
* Clear the state of this ModelAndView object.
* The object will be empty afterwards.
* Can be used to suppress rendering of a given ModelAndView object
* in the postHandle method of a HandlerInterceptor.
* @see #isEmpty()
* @see HandlerInterceptor#postHandle
*/
public void clear() {
this.view = null;
this.model = null;
this.cleared = true;
}
/**
* Return whether this ModelAndView object is empty
* i.e. whether it does not hold any view and does not contain a model.
*/
public boolean isEmpty() {
return (this.view == null && this.model == null);
}
/**
* Return whether this ModelAndView object is empty as a result of a call to {@link #clear}
* i.e. whether it does not hold any view and does not contain a model.
* Returns false if any additional state was added to the instance
* after the call to {@link #clear}.
* @see #clear()
*/
public boolean wasCleared() {
return (this.cleared && isEmpty());
}
/**
* Return diagnostic information about this model and view.
*/
public String toString() {
StringBuilder buf = new StringBuilder("ModelAndView: ");
if (isReference()) {
buf.append("reference to view with name '").append(this.view).append("'");
}
else {
buf.append("materialized View is [").append(this.view).append(']');
}
buf.append("; model is ").append(this.model);
return buf.toString();
}
public Errors getErrors() {
// TODO Auto-generated method stub
if(this.getModelMap() != null)
return this.getModelMap().getErrors();
else
return null;
}
public boolean hasErrors() {
// TODO Auto-generated method stub
if(this.getModelMap() != null)
return this.getModelMap().hasErrors();
else
return false;
}
}