com.amazonaws.services.dynamodbv2.xspec.FunctionCondition 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 com.amazonaws.annotation.Beta;

/**
 * Represents a Function condition in building condition expression.
 * 
 * Underlying grammar:
 * 
 * 
 * function ::=
 *    attribute_exists (path)
 *  | attribute_not_exists (path)
 *  | begins_with (path, operand)
 *  | contains (path, operand)
 * 
 * 
 * This object is as immutable (or unmodifiable) as the underlying operand.
 */
@Beta
public final class FunctionCondition extends Condition {
    private final String functionId;
    private final PathOperand pathOperand;
    private final Operand operand;

    FunctionCondition(String functionId, PathOperand attribute) {
        this.functionId = functionId;
        this.pathOperand = attribute;
        this.operand = null;
    }

    FunctionCondition(String functionId, PathOperand attribute, Operand operand) {
        this.functionId = functionId;
        this.pathOperand = attribute;
        this.operand = operand;
    }

    @Override
    String asSubstituted(SubstitutionContext context) {
        StringBuilder sb = new StringBuilder(functionId).append("(").append(
                pathOperand.asSubstituted(context));
        if (operand != null)
            sb.append(", ").append(operand.asSubstituted(context));
        return sb.append(")").toString();
    }

    String getFunctionId() {
        return functionId;
    }

    PathOperand getPathOperand() {
        return pathOperand;
    }

    Operand getOperand() {
        return operand;
    }

    @Override
    boolean atomic() {
        return true;
    }

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