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Cayenne Object Persistence Framework
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package org.apache.cayenne.exp.parser;
import org.apache.cayenne.exp.Expression;
import org.apache.cayenne.util.Util;
/**
* "Not equal to" expression.
*
* @author Andrei Adamchik
*/
public class ASTNotEqual extends ConditionNode {
ASTNotEqual(int id) {
super(id);
}
public ASTNotEqual() {
super(ExpressionParserTreeConstants.JJTNOTEQUAL);
}
/**
* Creates "Not Equal To" expression.
*/
public ASTNotEqual(ASTPath path, Object value) {
super(ExpressionParserTreeConstants.JJTNOTEQUAL);
jjtAddChild(path, 0);
jjtAddChild(new ASTScalar(value), 1);
}
protected Object evaluateNode(Object o) throws Exception {
int len = jjtGetNumChildren();
if (len != 2) {
return Boolean.FALSE;
}
Object o1 = evaluateChild(0, o);
Object o2 = evaluateChild(1, o);
return Util.nullSafeEquals(o1, o2) ? Boolean.FALSE : Boolean.TRUE;
}
/**
* Creates a copy of this expression node, without copying children.
*/
public Expression shallowCopy() {
return new ASTNotEqual(id);
}
protected String getExpressionOperator(int index) {
return "!=";
}
public int getType() {
return Expression.NOT_EQUAL_TO;
}
}
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