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/*
 * Copyright 2010-2014 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.internal;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.amazonaws.SDKGlobalConfiguration;
import com.amazonaws.services.s3.AmazonS3Client;

/**
 * Constants used by the AWS S3 Java client.
 */
public class Constants {

    /** Default hostname for the S3 service endpoint */
    public static String S3_HOSTNAME = "s3.amazonaws.com";

    /** Service name for Amazon S3 */
    public static String S3_SERVICE_NAME = "Amazon S3";

    /** Default encoding used for text data */
    public static String DEFAULT_ENCODING = "UTF-8";

    /** HMAC/SHA1 Algorithm per RFC 2104, used when signing S3 requests */
    public static final String HMAC_SHA1_ALGORITHM = "HmacSHA1";

    /** XML namespace URL used when sending S3 requests containing XML */
    public static final String XML_NAMESPACE = "http://s3.amazonaws.com/doc/2006-03-01/";

    /** Represents a null S3 version ID */
    public static final String NULL_VERSION_ID = "null";

    /**
     * HTTP status code indicating that preconditions failed and thus the
     * request failed.
     */
    public static final int FAILED_PRECONDITION_STATUS_CODE = 412;

    /** Kilobytes */
    public static final int KB = 1024;

    /** Megabytes */
    public static final int MB = 1024 * KB;

    /** Gigabytes */
    public static final long GB = 1024 * MB;

    /** The maximum allowed parts in a multipart upload. */
    public static final int MAXIMUM_UPLOAD_PARTS = 10000;

    /**
     * The default size of the buffer when uploading data from a stream. A
     * buffer of this size will be created and filled with the first bytes from
     * a stream being uploaded so that any transmit errors that occur in that
     * section of the data can be automatically retried without the caller's
     * intervention.
     */
    public static final int DEFAULT_STREAM_BUFFER_SIZE = 128 * KB;

    /**
     * Returns the buffer size override if it is specified in the system property,
     * otherwise returns the default value.
     */
    public static int getStreamBufferSize() {
    	int streamBufferSize = DEFAULT_STREAM_BUFFER_SIZE;
        String bufferSizeOverride =
            System.getProperty(SDKGlobalConfiguration
                                   .DEFAULT_S3_STREAM_BUFFER_SIZE);

        if (bufferSizeOverride != null) {
            try {
                streamBufferSize = Integer.parseInt(bufferSizeOverride);
            } catch (Exception e) {
                log.warn("Unable to parse buffer size override from value: " + bufferSizeOverride);
            }
        }
        return streamBufferSize;
    }

    /** Shared logger for client events */
    private static Log log = LogFactory.getLog(AmazonS3Client.class);

    public static final int NO_SUCH_BUCKET_STATUS_CODE = 404;

    public static final int BUCKET_ACCESS_FORBIDDEN_STATUS_CODE = 403;

    public static final int BUCKET_REDIRECT_STATUS_CODE = 301;

    // Constant indicating the requester pays for data transfer cost for a bucket.
    public static final String REQUESTER_PAYS = "requester";
}