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The AWS Java SDK for Amazon S3 module holds the client classes that are used for communicating with Amazon Simple Storage Service
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/*
 * Copyright 2014-2024 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;
import java.io.Serializable;

import static com.amazonaws.services.s3.model.InstructionFileId.DEFAULT_INSTRUCTION_FILE_SUFFIX;
import static com.amazonaws.services.s3.model.InstructionFileId.DOT;

import com.amazonaws.annotation.Immutable;

/**
 * An Immutable S3 object identifier. Used to uniquely identify an S3 object.
 * Can be instantiated directly, or via the convenient builder
 * {@link S3ObjectIdBuilder}.
 */
@Immutable
public class S3ObjectId implements Serializable {
    private final String bucket;
    private final String key;
    /**
     * Optional and applicable only for get operation.
     */
    private final String versionId;

    public S3ObjectId(String bucket, String key) {
        this(bucket, key, null);
    }

    /**
     * @param bucket
     *            the S3 bucket name which must not be null
     * @param key
     *            the S3 key name which must not be null
     * @param versionId
     *            optional version id
     */
    public S3ObjectId(String bucket, String key, String versionId) {
        if (bucket == null || key == null)
            throw new IllegalArgumentException(
                    "bucket and key must be specified");
        this.bucket = bucket;
        this.key = key;
        this.versionId = versionId;
    }

    /**
     * @param builder
     *            must not be null.
     */
    public S3ObjectId(S3ObjectIdBuilder builder) {
        this.bucket = builder.getBucket();
        this.key = builder.getKey();
        this.versionId = builder.getVersionId();
    }

    public String getBucket() {
        return bucket;
    }

    public String getKey() {
        return key;
    }

    /**
     * Returns the version id which is optionally applicable for S3 get (but not
     * put) operations.
     */
    public String getVersionId() {
        return versionId;
    }

    /**
     * Returns the instruction file id of the default instruction file.
     */
    public InstructionFileId instructionFileId() {
        return instructionFileId(null);
    }

    /**
     * Returns the instruction file id of an instruction file with the given
     * suffix.
     */
    public InstructionFileId instructionFileId(String suffix) {
        String ifileKey = key + DOT;
        ifileKey += (suffix == null || suffix.trim().length() == 0)
                  ? DEFAULT_INSTRUCTION_FILE_SUFFIX
                  : suffix
                  ;
         return new InstructionFileId(bucket, ifileKey, versionId);
    }

    @Override
    public String toString() {
        return "bucket: " + bucket + ", key: " + key + ", versionId: "
                + versionId;
    }
}