/*
* Copyright 2004-2008 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.ExpressionVariable;
import org.springframework.binding.expression.ParserContext;
/**
* A null object implementation of ParserContext. Mainly used internally by expression parser implementations when
* <code>null</code> is passed in as a parser context value.
* @author Keith Donad
*/
public final class NullParserContext implements ParserContext {
/**
* The null parser context object instance; a singleton.
*/
public static final ParserContext INSTANCE = new NullParserContext();
private NullParserContext() {
}
public Class getEvaluationContextType() {
return null;
}
public Class getExpectedEvaluationResultType() {
return null;
}
public ExpressionVariable[] getExpressionVariables() {
return null;
}
public boolean isTemplate() {
return false;
}
}
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