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MoveObject.java
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MoveObject.java
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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_move_file]
import com.google.cloud.storage.Blob;
import com.google.cloud.storage.BlobId;
import com.google.cloud.storage.Storage;
import com.google.cloud.storage.StorageOptions;
public class MoveObject {
public static void moveObject(
String projectId,
String sourceBucketName,
String sourceObjectName,
String targetBucketName,
String targetObjectName) {
// The ID of your GCP project
// String projectId = "your-project-id";
// The ID of your GCS bucket
// String bucketName = "your-unique-bucket-name";
// The ID of your GCS object
// String sourceObjectName = "your-object-name";
// The ID of the bucket to move the object objectName to
// String targetBucketName = "target-object-bucket"
// The ID of your GCS object
// String targetObjectName = "your-new-object-name";
Storage storage = StorageOptions.newBuilder().setProjectId(projectId).build().getService();
BlobId source = BlobId.of(sourceBucketName, sourceObjectName);
BlobId target = BlobId.of(targetBucketName, targetObjectName);
// Optional: 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;
if (storage.get(targetBucketName, targetObjectName) == 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(
storage.get(targetBucketName, targetObjectName).getGeneration());
}
// Copy source object to target object
storage.copy(
Storage.CopyRequest.newBuilder().setSource(source).setTarget(target, precondition).build());
Blob copiedObject = storage.get(target);
// Delete the original blob now that we've copied to where we want it, finishing the "move"
// operation
storage.get(source).delete();
System.out.println(
"Moved object "
+ sourceObjectName
+ " from bucket "
+ sourceBucketName
+ " to "
+ targetObjectName
+ " in bucket "
+ copiedObject.getBucket());
}
}
// [END storage_move_file]