content: /*
   * Copyright (C) 2017 The Android Open Source Project
   *
   * 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.android.exoplayer2.upstream;
  
  import android.net.Uri;
  import java.io.IOException;
  
  /**
   * A dummy DataSource which provides no data. {@link #open(DataSpec)} throws {@link IOException}.
   */
  public final class DummyDataSource implements DataSource {
  
    public static final DummyDataSource INSTANCE = new DummyDataSource();
  
    /** A factory that produces {@link DummyDataSource}. */
    public static final Factory FACTORY = new Factory() {
      @Override
      public DataSource createDataSource() {
        return new DummyDataSource();
      }
    };
  
    private DummyDataSource() {}
  
    @Override
    public long open(DataSpec dataSpec) throws IOException {
      throw new IOException("Dummy source");
    }
  
    @Override
    public int read(byte[] buffer, int offset, int readLength) throws IOException {
      throw new UnsupportedOperationException();
    }
  
    @Override
    public Uri getUri() {
      return null;
    }
  
    @Override
    public void close() throws IOException {
      // do nothing.
    }
  
  }
  