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 *  to you under the Apache License, Version 2.0 (the
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package org.apache.cayenne.exp.parser;

import org.apache.cayenne.exp.Expression;
import org.apache.cayenne.util.ConversionUtil;

/**
 * "Like" expression.
 * 
 * @author Andrei Adamchik
 */
public class ASTLike extends PatternMatchNode {
    ASTLike(int id) {
        super(id, false);
    }

    public ASTLike() {
        super(ExpressionParserTreeConstants.JJTLIKE, false);
    }

    public ASTLike(ASTPath path, Object pattern) {
        super(ExpressionParserTreeConstants.JJTLIKE, false);
        jjtAddChild(path, 0);
        jjtAddChild(wrapChild(pattern), 1);
    }

    protected Object evaluateNode(Object o) throws Exception {
        int len = jjtGetNumChildren();
        if (len != 2) {
            return Boolean.FALSE;
        }

        String s1 = ConversionUtil.toString(evaluateChild(0, o));
        if (s1 == null) {
            return Boolean.FALSE;
        }

        return matchPattern(s1) ? Boolean.TRUE : Boolean.FALSE;
    }

    /**
     * Creates a copy of this expression node, without copying children.
     */
    public Expression shallowCopy() {
        return new ASTLike(id);
    }

    protected String getExpressionOperator(int index) {
        return "like";
    }

    public int getType() {
        return Expression.LIKE;
    }
}