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org.springframework.webflow.expression.WebFlowOgnlExpressionParser Maven / Gradle / Ivy
/*
* Copyright 2004-2012 the original author or authors.
*
* 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.springframework.webflow.expression;
import java.util.Map;
import ognl.ObjectPropertyAccessor;
import ognl.Ognl;
import ognl.OgnlException;
import ognl.PropertyAccessor;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.support.StaticListableBeanFactory;
import org.springframework.binding.collection.MapAdaptable;
import org.springframework.binding.expression.ognl.OgnlExpressionParser;
import org.springframework.context.MessageSource;
import org.springframework.webflow.context.ExternalContext;
import org.springframework.webflow.context.ExternalContextHolder;
import org.springframework.webflow.core.collection.MutableAttributeMap;
import org.springframework.webflow.execution.Action;
import org.springframework.webflow.execution.AnnotatedAction;
import org.springframework.webflow.execution.RequestContext;
import org.springframework.webflow.expression.spel.WebFlowSpringELExpressionParser;
/**
* An extension of {@link OgnlExpressionParser} that registers Web Flow-specific PropertyAccessors.
*
* @author Keith Donald
*
* @deprecated in favor of Spring EL, see {@link WebFlowSpringELExpressionParser}
*/
@SuppressWarnings("rawtypes")
public class WebFlowOgnlExpressionParser extends OgnlExpressionParser {
/**
* Creates a Web Flow OGNL Expression Parser.
*/
public WebFlowOgnlExpressionParser() {
addPropertyAccessor(MapAdaptable.class, new MapAdaptablePropertyAccessor());
addPropertyAccessor(MutableAttributeMap.class, new MutableAttributeMapPropertyAccessor());
addPropertyAccessor(MessageSource.class, new MessageSourcePropertyAccessor());
addPropertyAccessor(RequestContext.class, new RequestContextPropertyAccessor(new ObjectPropertyAccessor()));
addPropertyAccessor(Action.class, new ActionPropertyAccessor());
}
/**
* Resolves Map Adaptable properties.
*/
private static class MapAdaptablePropertyAccessor implements PropertyAccessor {
public Object getProperty(Map context, Object target, Object name) throws OgnlException {
return ((MapAdaptable) target).asMap().get(name);
}
public void setProperty(Map context, Object target, Object name, Object value) throws OgnlException {
throw new UnsupportedOperationException(
"Cannot mutate immutable attribute collections; operation disallowed");
}
}
/**
* Resolves Mutable Attribute Map properties, also capable of setting properties.
*/
private static class MutableAttributeMapPropertyAccessor extends MapAdaptablePropertyAccessor {
@SuppressWarnings("unchecked")
public void setProperty(Map context, Object target, Object name, Object value) throws OgnlException {
((MutableAttributeMap) target).put((String) name, value);
}
}
/**
* Resolves RequestContext properties. Supports several implicit variables and scope searching routines.
*/
private static class RequestContextPropertyAccessor implements PropertyAccessor {
private static final BeanFactory EMPTY_BEAN_FACTORY = new StaticListableBeanFactory();
private PropertyAccessor delegate;
public RequestContextPropertyAccessor(PropertyAccessor delegate) {
this.delegate = delegate;
}
public Object getProperty(Map context, Object target, Object name) throws OgnlException {
String property = name.toString();
RequestContext requestContext = (RequestContext) target;
if (property.equals("flowRequestContext")) {
return requestContext;
}
if (property.equals("currentUser")) {
return requestContext.getExternalContext().getCurrentUser();
}
if (property.equals("resourceBundle")) {
return requestContext.getActiveFlow().getApplicationContext();
}
if (requestContext.getRequestScope().contains(property)) {
return requestContext.getRequestScope().get(property);
} else if (requestContext.getFlashScope().contains(property)) {
return requestContext.getFlashScope().get(property);
} else if (requestContext.inViewState() && requestContext.getViewScope().contains(property)) {
return requestContext.getViewScope().get(property);
} else if (requestContext.getFlowScope().contains(property)) {
return requestContext.getFlowScope().get(property);
} else if (requestContext.getConversationScope().contains(property)) {
return requestContext.getConversationScope().get(property);
}
BeanFactory bf = getBeanFactory(requestContext);
if (bf.containsBean(property)) {
return bf.getBean(property);
}
return delegate.getProperty(context, target, name);
}
public void setProperty(Map context, Object target, Object name, Object value) throws OgnlException {
String property = name.toString();
RequestContext requestContext = (RequestContext) target;
if (property.equals("flowRequestContext")) {
throw new OgnlException("The 'flowRequestContext' variable is not writeable");
}
if (property.equals("currentUser")) {
throw new OgnlException("The 'currentUser' variable is not writeable");
}
if (property.equals("resourceBundle")) {
throw new OgnlException("The 'resourceBundle' variable is not writeable");
}
if (requestContext.getRequestScope().contains(property)) {
requestContext.getRequestScope().put(property, value);
} else if (requestContext.getFlashScope().contains(property)) {
requestContext.getFlashScope().put(property, value);
} else if (requestContext.inViewState() && requestContext.getViewScope().contains(property)) {
requestContext.getViewScope().put(property, value);
} else if (requestContext.getFlowScope().contains(property)) {
requestContext.getFlowScope().put(property, value);
} else if (requestContext.getConversationScope().contains(property)) {
requestContext.getConversationScope().put(property, value);
} else {
delegate.setProperty(context, target, name, value);
}
}
private BeanFactory getBeanFactory(RequestContext requestContext) {
BeanFactory beanFactory = requestContext.getActiveFlow().getApplicationContext();
return beanFactory != null ? beanFactory : EMPTY_BEAN_FACTORY;
}
}
/**
* Resolves multi action methods.
*/
private static class ActionPropertyAccessor implements PropertyAccessor {
public Object getProperty(Map context, Object target, Object name) throws OgnlException {
Action action = (Action) target;
AnnotatedAction annotated = new AnnotatedAction(action);
annotated.setMethod(name.toString());
return annotated;
}
public void setProperty(Map context, Object target, Object name, Object value) throws OgnlException {
throw new OgnlException("Cannot set properties on a Action instance - operation not allowed");
}
}
/**
* Resolves messages.
*/
private static class MessageSourcePropertyAccessor implements PropertyAccessor {
public Object getProperty(Map context, Object target, Object name) throws OgnlException {
MessageSource messageSource = (MessageSource) target;
ExternalContext externalContext;
Object root = Ognl.getRoot(context);
if (root instanceof RequestContext) {
externalContext = ((RequestContext) root).getExternalContext();
} else {
externalContext = ExternalContextHolder.getExternalContext();
}
if (externalContext != null) {
return messageSource.getMessage(name.toString(), null, null, externalContext.getLocale());
} else {
return messageSource.getMessage(name.toString(), null, null, null);
}
}
public void setProperty(Map context, Object target, Object name, Object value) throws OgnlException {
throw new OgnlException("Cannot set properties on a MessageSource instance - operation not allowed");
}
}
}
