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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.ArrayList;
import java.util.List;
import java.util.regex.Pattern;

import org.apache.http.annotation.Immutable;

/**
 * Internal representation of a path to an attribute.
 */
@Immutable
final class Path extends UnitOfExpression {
    private final List elements;
    
    Path(String path) {
        this.elements = parse(path);
    }

    private List parse(String path) {
        if (path == null) {
            throw new NullPointerException("path");
        }

        final String[] split = path.split(Pattern.quote("."));
        final List elements = new ArrayList();

        for (String element : split) {
            int index = element.indexOf('[');
            if (index == -1) {
                elements.add(new NamedElement(element));
                continue;
            }

            if (index == 0) {
                throw new IllegalArgumentException("Bogus path: " + path);
            }

            elements.add(new NamedElement(element.substring(0, index)));

            do {
                element = element.substring(index + 1);
                index = element.indexOf(']');

                if (index == -1) {
                    throw new IllegalArgumentException("Bogus path: " + path);
                }

                int arrayIndex = Integer.parseInt(element.substring(0, index));
                elements.add(new ArrayIndexElement(arrayIndex));

                element = element.substring(index + 1);
                index = element.indexOf('[');

                if (index > 0)
                    throw new IllegalArgumentException("Bogus path: " + path);
            } while (index != -1);

            if (!element.isEmpty()) {
                throw new IllegalArgumentException("Bogus path: " + path);
            }
        }

        return elements;
    }

    @Override
    String asSubstituted(SubstitutionContext context) {
        StringBuffer sb = new StringBuffer();
        for (PathElement e: elements) {
            if (sb.length() == 0)
                sb.append(e.asToken(context));
            else {
                sb.append(e.asNestedToken(context));
            }
        }
        return sb.toString();
    }

    // Reverse to the original input path for debug purposes.
    @Override
    public String toString() {
        StringBuffer sb = new StringBuffer();
        for (PathElement e: elements) {
            if (sb.length() == 0)
                sb.append(e.toString());
            else {
                sb.append(e.asNestedPath());
            }
        }
        return sb.toString();
    }

    List getElements() {
        return elements;
    }
}