/*
* 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.binding.expression.support;
import org.springframework.binding.expression.EvaluationException;
import org.springframework.binding.expression.Expression;
/**
* Trivial helper for concrete expression types that do not support setting their values. Simply throws an unsupported
* operation exception if {@link #setValue(Object, Object)} is called.
*
* Subclasses must implement {@link #getValue(Object)}.
*
* @author Keith Donald
*/
public abstract class AbstractGetValueExpression implements Expression {
public abstract Object getValue(Object context) throws EvaluationException;
public void setValue(Object context, Object value) throws EvaluationException {
throw new UnsupportedOperationException("Setting this expression's value is not supported");
}
public Class<?> getValueType(Object context) {
return null;
}
public String getExpressionString() {
return null;
}
}