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• ComparatorCondition.java

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com.amazonaws.services.dynamodbv2.xspec.ComparatorCondition Maven / Gradle / Ivy

/*
 * Copyright 2015-2016 Amazon Technologies, Inc.
 *
 * Licensed 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://aws.amazon.com/apache2.0
 *
 * This file 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 com.amazonaws.services.dynamodbv2.xspec;

import com.amazonaws.annotation.Beta;

/**
 * Represents a Comparator condition in building condition expression.
 * 

 * Underlying grammar:
 * 
 * 
 *    operand comparator_symbol operand
 * 
 *    comparator_symbol ::=
 *        =
 *      | <>
 *      | <
 *      | <=
 *      | >
 *      | >=
 * 
 * 

 * This object is as immutable (or unmodifiable) as the underlying operands.
 */
@Beta
public final class ComparatorCondition extends Condition {
    private final String comparator;
    private final Operand lhs;
    private final Operand rhs;

    ComparatorCondition(String comparator, Operand lhs, Operand rhs) {
        this.comparator = comparator;
        this.lhs = lhs;
        this.rhs = rhs;
    }

    @Override
    String asSubstituted(SubstitutionContext context) {
        return lhs.asSubstituted(context) + " " + comparator + " "
                + rhs.asSubstituted(context);
    }

    @Override
    boolean atomic() {
        return true;
    }

    @Override
    int precedence() {
        return Precedence.Comparator.value();
    }
}