| /* |
| * Copyright (C) 2011 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.android.tradefed.result; |
| |
| import com.android.tradefed.log.LogUtil.CLog; |
| import com.android.tradefed.util.FileUtil; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| /** |
| * A File-backed InputStreamSource. Creates a snapshot of original {@link InputStream} contents to |
| * ensure that {@link #createInputStream()} will return identically-behaving {@link InputStream}s as |
| * required. |
| */ |
| public class SnapshotInputStreamSource implements InputStreamSource { |
| private File mBackingFile; |
| private boolean mIsCancelled = false; |
| |
| /** Constructor for a file-backed {@link InputStreamSource} */ |
| public SnapshotInputStreamSource(String name, InputStream stream) { |
| if (stream == null) { |
| throw new NullPointerException(); |
| } |
| |
| try { |
| mBackingFile = createBackingFile(name, stream); |
| } catch (IOException e) { |
| // Log an error and invalidate ourself |
| CLog.e("Received IOException while trying to wrap a stream"); |
| CLog.e(e); |
| close(); |
| } |
| } |
| |
| /** |
| * Create the backing file and fill it with the contents of {@code stream}. |
| * |
| * <p>Exposed for unit testing |
| */ |
| File createBackingFile(String name, InputStream stream) throws IOException { |
| File backingFile = |
| FileUtil.createTempFile(name + "_" + this.getClass().getSimpleName() + "_", ".txt"); |
| FileUtil.writeToFile(stream, backingFile); |
| return backingFile; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public synchronized InputStream createInputStream() { |
| if (mIsCancelled) { |
| return null; |
| } |
| |
| try { |
| return new FileInputStream(mBackingFile); |
| } catch (IOException e) { |
| return null; |
| } |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public synchronized void close() { |
| mIsCancelled = true; |
| FileUtil.deleteFile(mBackingFile); |
| mBackingFile = null; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public long size() { |
| return mBackingFile.length(); |
| } |
| } |
| |