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package org.apache.cayenne.exp.parser;

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

/**
 * "Between" expression.
 * 
 * @since 1.1
 * @author Andrei Adamchik
 */
public class ASTBetween extends ConditionNode {

    ASTBetween(int id) {
        super(id);
    }

    public ASTBetween() {
        super(ExpressionParserTreeConstants.JJTBETWEEN);
    }

    public ASTBetween(ASTPath path, Object value1, Object value2) {
        super(ExpressionParserTreeConstants.JJTBETWEEN);
        jjtAddChild(path, 0);
        jjtAddChild(new ASTScalar(value1), 1);
        jjtAddChild(new ASTScalar(value2), 2);
    }

    protected Object evaluateNode(Object o) throws Exception {
        int len = jjtGetNumChildren();
        if (len != 3) {
            return Boolean.FALSE;
        }

        Comparable c1 = ConversionUtil.toComparable(evaluateChild(0, o));

        if (c1 == null) {
            return Boolean.FALSE;
        }

        Comparable c2 = ConversionUtil.toComparable(evaluateChild(1, o));
        if (c2 == null) {
            return Boolean.FALSE;
        }

        Comparable c3 = ConversionUtil.toComparable(evaluateChild(2, o));
        if (c3 == null) {
            return Boolean.FALSE;
        }

        return c1.compareTo(c2) >= 0
            && c1.compareTo(c3) <= 0 ? Boolean.TRUE : Boolean.FALSE;
    }

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

    protected String getExpressionOperator(int index) {
        return (index == 2) ? "and" : "between";
    }

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