org.springframework.webflow.core.WebFlowOgnlExpressionParser Maven / Gradle / Ivy
/*
* Copyright 2002-2006 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.core;
import java.util.Map;
import ognl.OgnlException;
import ognl.PropertyAccessor;
import org.springframework.binding.collection.MapAdaptable;
import org.springframework.binding.expression.support.OgnlExpressionParser;
import org.springframework.webflow.core.collection.MutableAttributeMap;
/**
* An extension of {@link OgnlExpressionParser} that registers web flow specific
* property accessors.
*
* @author Keith Donald
*/
class WebFlowOgnlExpressionParser extends OgnlExpressionParser {
/**
* Creates a webflow-specific ognl expression parser.
*/
public WebFlowOgnlExpressionParser() {
addPropertyAccessor(MapAdaptable.class, new MapAdaptablePropertyAccessor());
addPropertyAccessor(MutableAttributeMap.class, new MutableAttributeMapPropertyAccessor());
}
/**
* The {@link MapAdaptable} property accessor.
*
* @author Keith Donald
*/
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");
}
}
/**
* The {@link MutableAttributeMap} property accessor.
*
* @author Keith Donald
*/
private static class MutableAttributeMapPropertyAccessor extends MapAdaptablePropertyAccessor {
public void setProperty(Map context, Object target, Object name, Object value) throws OgnlException {
((MutableAttributeMap)target).put((String)name, value);
}
}
}