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Copy pathCopyObject.java
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86 lines (75 loc) · 3.47 KB
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/*
* Copyright 2020 Google LLC
*
* 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://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License 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.example.storage.object;
// [START storage_copy_file]
import com.google.cloud.storage.BlobId;
import com.google.cloud.storage.BlobInfo;
import com.google.cloud.storage.CopyWriter;
import com.google.cloud.storage.Storage;
import com.google.cloud.storage.Storage.CopyRequest;
import com.google.cloud.storage.StorageOptions;
public class CopyObject {
public static void copyObject(
String projectId, String sourceBucketName, String objectName, String targetBucketName)
throws Exception {
// The ID of your GCP project
// String projectId = "your-project-id";
// The ID of the bucket the original object is in
// String sourceBucketName = "your-source-bucket";
// The ID of the GCS object to copy
// String objectName = "your-object-name";
// The ID of the bucket to copy the object to
// String targetBucketName = "target-object-bucket";
try (Storage storage =
StorageOptions.newBuilder().setProjectId(projectId).build().getService()) {
BlobId sourceId = BlobId.of(sourceBucketName, objectName);
// you could change "objectName" to rename the object
BlobId targetId = BlobId.of(targetBucketName, objectName);
// Recommended: set a generation-match precondition to avoid potential race
// conditions and data corruptions. The request returns a 412 error if the
// preconditions are not met.
Storage.BlobTargetOption precondition;
BlobInfo existingTarget = storage.get(targetBucketName, objectName);
if (existingTarget == null) {
// For a target object that does not yet exist, set the DoesNotExist precondition.
// This will cause the request to fail if the object is created before the request runs.
precondition = Storage.BlobTargetOption.doesNotExist();
} else {
// If the destination already exists in your bucket, instead set a generation-match
// precondition. This will cause the request to fail if the existing object's generation
// changes before the request runs.
precondition = Storage.BlobTargetOption.generationMatch(existingTarget.getGeneration());
}
CopyRequest copyRequest =
CopyRequest.newBuilder()
.setSource(sourceId)
.setTarget(targetId, precondition)
// limit the number of bytes Cloud Storage will attempt to copy before responding to
// an individual request.
// If you see Read Timeout errors, try reducing this value.
.setMegabytesCopiedPerChunk(2048L) // 2GiB
.build();
CopyWriter copyWriter = storage.copy(copyRequest);
BlobInfo successfulCopyResult = copyWriter.getResult();
System.out.printf(
"Copied object gs://%s/%s to %s%n",
sourceBucketName,
objectName,
successfulCopyResult.getBlobId().toGsUtilUriWithGeneration());
}
}
}
// [END storage_copy_file]