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

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The AWS SDK for Java with support for OSGi. The AWS SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * 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 java.util.List;

import com.amazonaws.annotation.Beta;

/**
 * Represents a IN condition in building condition expression.
 * 
 * Underlying grammar:
 * 
 * 
 *    operand IN ( operand (',' operand (, ...) ))
 * 
 * 
 * This object is as immutable (or unmodifiable) as the underlying set of
 * operands.
 */
@Beta
public final class InCondition extends Condition {
    private final PathOperand attribute;
    private final List operands;

    /**
     * @param operands assumed to be allocated on the stack so it will remain
     * externally unmodifiable
     */
    InCondition(PathOperand attribute, List operands) {
        this.attribute = attribute;
        this.operands = operands;
    }

    @Override
    String asSubstituted(SubstitutionContext context) {
        StringBuilder sb = new StringBuilder(attribute.asSubstituted(context))
                .append(" IN (");
        boolean first = true;
        for (Operand operand : operands) {
            if (first) {
                sb.append(operand.asSubstituted(context));
                first = false;
            } else {
                sb.append(", ").append(operand.asSubstituted(context));
            }
        }
        return sb.append(")").toString();
    }

    @Override
    boolean atomic() {
        return true;
    }

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