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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 2010-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. 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.s3.model.transform;

import java.util.LinkedList;

import org.xml.sax.Attributes;
import org.xml.sax.helpers.DefaultHandler;

/**
 * Package private abstract base for all handlers here; adds tracking of the
 * current context so each handler doesn't have to manage it on its own.
 */
abstract class AbstractHandler extends DefaultHandler {

    private final StringBuilder text = new StringBuilder();
    private final LinkedList context = new LinkedList();

    @Override
    public final void startElement(
            String uri,
            String name,
            String qName,
            Attributes attrs) {

        text.setLength(0);
        doStartElement(uri, name, qName, attrs);
        context.add(name);
    }

    protected abstract void doStartElement(
            String uri,
            String name,
            String qName,
            Attributes attrs);

    @Override
    public final void endElement(String uri, String name, String qName) {
        context.removeLast();
        doEndElement(uri, name, qName);
    }

    protected abstract void doEndElement(
            String uri,
            String name,
            String qName);

    @Override
    public final void characters(char ch[], int start, int length) {
        text.append(ch, start, length);
    }

    protected final String getText() {
        return text.toString();
    }

    protected final boolean atTopLevel() {
        return context.isEmpty();
    }

    /**
     * @param path
     *            Path to test
     * @return True if the path provided is the same as the current context. False otherwise
     */
    protected final boolean in(String... path) {
        if (path.length != context.size()) {
            return false;
        }

        int i = 0;
        for (String element : context) {
            String pattern = path[i];
            if (!(pattern.equals("*") || pattern.equals(element))) {
                return false;
            }
            i += 1;
        }

        return true;
    }

}