com.google.cloud.storage.ResponseContentLifecycleHandle Maven / Gradle / Ivy

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Java idiomatic client for Google Cloud Storage.

There is a newer version: 2.45.0

/*
 * Copyright 2024 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.google.cloud.storage;

import com.google.storage.v2.ReadObjectResponse;
import java.io.Closeable;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.List;
import org.checkerframework.checker.nullness.qual.Nullable;

final class ResponseContentLifecycleHandle implements Closeable {
  @Nullable private final Closeable dispose;

  private final List buffers;

  ResponseContentLifecycleHandle(ReadObjectResponse resp, @Nullable Closeable dispose) {
    this.dispose = dispose;

    this.buffers = resp.getChecksummedData().getContent().asReadOnlyByteBufferList();
  }

  void copy(ReadCursor c, ByteBuffer[] dsts, int offset, int length) {
    for (ByteBuffer b : buffers) {
      long copiedBytes = Buffers.copy(b, dsts, offset, length);
      c.advance(copiedBytes);
      if (b.hasRemaining()) break;
    }
  }

  boolean hasRemaining() {
    for (ByteBuffer b : buffers) {
      if (b.hasRemaining()) return true;
    }
    return false;
  }

  @Override
  public void close() throws IOException {
    if (dispose != null) {
      dispose.close();
    }
  }
}