/*****************************************************************
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.cayenne.exp.parser;
import java.io.IOException;
import java.math.BigDecimal;
import java.util.List;
import org.apache.cayenne.exp.Expression;
import org.apache.cayenne.util.ConversionUtil;
/**
* "Negate" expression.
*
* @since 1.1
*/
public class ASTNegate extends SimpleNode {
private static final long serialVersionUID = -9161722951926428414L;
ASTNegate(int id) {
super(id);
}
public ASTNegate() {
super(ExpressionParserTreeConstants.JJTNEGATE);
}
public ASTNegate(Object node) {
super(ExpressionParserTreeConstants.JJTNEGATE);
jjtAddChild(wrapChild(node), 0);
connectChildren();
}
/**
* Creates a copy of this expression node, without copying children.
*/
@Override
public Expression shallowCopy() {
return new ASTNegate(id);
}
@Override
protected Object evaluateNode(Object o) throws Exception {
int len = jjtGetNumChildren();
if (len == 0) {
return null;
}
BigDecimal result = ConversionUtil.toBigDecimal(evaluateChild(0, o));
return result != null ? result.negate() : null;
}
/**
* @since 4.0
*/
@Override
public void appendAsString(Appendable out) throws IOException {
if ((children != null) && (children.length > 0)) {
out.append("-");
SimpleNode child = (SimpleNode) children[0];
// don't call super - we have our own parenthesis policy
boolean useParen = parent != null && !((child instanceof ASTScalar) || (child instanceof ASTPath));
if (useParen) {
out.append("(");
}
child.appendAsString(out);
if (useParen) {
out.append(')');
}
}
}
/**
* @since 4.0
*/
@Override
public void appendAsEJBQL(List<Object> parameterAccumulator, Appendable out, String rootId) throws IOException {
if ((children != null) && (children.length > 0)) {
out.append("-");
SimpleNode child = (SimpleNode) children[0];
// don't call super - we have our own parenthesis policy
boolean useParen = parent != null && !((child instanceof ASTScalar) || (child instanceof ASTPath));
if (useParen) {
out.append("(");
}
child.appendAsEJBQL(parameterAccumulator, out, rootId);
if (useParen) {
out.append(')');
}
}
}
@Override
protected String getExpressionOperator(int index) {
throw new UnsupportedOperationException("No operator for '" + ExpressionParserTreeConstants.jjtNodeName[id]
+ "'");
}
@Override
public int getType() {
return Expression.NEGATIVE;
}
@Override
public int getOperandCount() {
return 1;
}
}