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/*****************************************************************
 *   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
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 *
 *    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
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package org.apache.cayenne.exp.parser;

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

/**
 * @since 3.1
 */
public class ASTBitwiseXor extends SimpleNode {

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

    public ASTBitwiseXor() {

        // TODO: parser support
        super(-1);
    }

    public ASTBitwiseXor(SimpleNode left, SimpleNode right) {
        // TODO: parser support
        super(-1);

        jjtAddChild(left, 0);
        jjtAddChild(right, 1);
        connectChildren();
    }

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

        long result = Long.MIN_VALUE;
        for (int i = 0; i < len; i++) {
            long value = ConversionUtil.toLong(evaluateChild(i, o), Long.MIN_VALUE);

            if (value == Long.MIN_VALUE) {
                return null;
            }

            result = (i == 0) ? value : result ^ value;
        }

        return result;
    }

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

    @Override
    protected String getExpressionOperator(int index) {
        return "^";
    }

    @Override
    protected String getEJBQLExpressionOperator(int index) {
        throw new UnsupportedOperationException("EJBQL 'bitwise xor' is not supported");
    }

    @Override
    public int getType() {
        return Expression.BITWISE_XOR;
    }

}