/*
* Copyright 2002-2009 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.expression.spel.ast;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.expression.EvaluationException;
import org.springframework.expression.TypedValue;
import org.springframework.expression.spel.ExpressionState;
import org.springframework.expression.spel.SpelEvaluationException;
import org.springframework.expression.spel.SpelMessage;
import org.springframework.expression.spel.support.BooleanTypedValue;
/**
* Represents a NOT operation.
*
* @author Andy Clement
* @author Mark Fisher
* @since 3.0
*/
public class OperatorNot extends SpelNodeImpl { // Not is a unary operator so do not extend BinaryOperator
public OperatorNot(int pos, SpelNodeImpl operand) {
super(pos, operand);
}
@Override
public BooleanTypedValue getValueInternal(ExpressionState state) throws EvaluationException {
try {
TypedValue typedValue = children[0].getValueInternal(state);
if (TypedValue.NULL.equals(typedValue)) {
throw new SpelEvaluationException(SpelMessage.TYPE_CONVERSION_ERROR, "null", "boolean");
}
boolean value = (Boolean) state.convertValue(typedValue, TypeDescriptor.valueOf(Boolean.class));
return BooleanTypedValue.forValue(!value);
}
catch (SpelEvaluationException see) {
see.setPosition(getChild(0).getStartPosition());
throw see;
}
}
@Override
public String toStringAST() {
StringBuilder sb = new StringBuilder();
sb.append("!").append(getChild(0).toStringAST());
return sb.toString();
}
}
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