com.amazonaws.services.dynamodbv2.xspec.LiteralOperand 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 java.util.Map;
import java.util.Set;

/**
 * Represents a literal value in building expressions.
 * 
 * This object is as immutable (or unmodifiable) as the underlying value given
 * during construction.
 */
class LiteralOperand extends Operand {
    private final Object value;

    /**
     * Represents a null value.
     */
    LiteralOperand() {
        this.value = null;
    }

    /**
     * @param value
     *            must be a supported type by the DynamoDB Document API.
     */
    LiteralOperand(Object value) {
        this.value = value;
    }

    /**
     * Must be a set of String, Number, or byte[].
     */
    LiteralOperand(Set value) {
        this.value = value;
    }

    /**
     * Must be a list of supported types by the DynamoDB Document API.
     */
    LiteralOperand(List value) {
        this.value = value;
    }

    /**
     * Each value of the map must be a supported type by the DynamoDB Document
     * API.
     */
    LiteralOperand(Map value) {
        this.value = value;
    }

    LiteralOperand(boolean value) {
        this.value = value;
    }

    @Override
    final String asSubstituted(SubstitutionContext context) {
        return context.valueTokenFor(value);
    }

    @Override
    public String toString() {
        return String.valueOf(value);
    }
}