1 files changed, 116 insertions, 0 deletions
diff --git a/jimfs/src/main/java/com/google/common/jimfs/JimfsOutputStream.java b/jimfs/src/main/java/com/google/common/jimfs/JimfsOutputStream.java
new file mode 100644
index 0000000..0b88046
--- /dev/null
+++ b/jimfs/src/main/java/com/google/common/jimfs/JimfsOutputStream.java
@@ -0,0 +1,116 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * 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.common.jimfs;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.google.common.base.Preconditions.checkPositionIndexes;
+
+import com.google.common.annotations.VisibleForTesting;
+import java.io.IOException;
+import java.io.OutputStream;
+
+/**
+ * {@link OutputStream} for writing to a {@link RegularFile}.
+ *
+ * @author Colin Decker
+ */
+final class JimfsOutputStream extends OutputStream {
+
+  @GuardedBy("this")
+  @VisibleForTesting
+  RegularFile file;
+
+  @GuardedBy("this")
+  private long pos;
+
+  private final boolean append;
+  private final FileSystemState fileSystemState;
+
+  JimfsOutputStream(RegularFile file, boolean append, FileSystemState fileSystemState) {
+    this.file = checkNotNull(file);
+    this.append = append;
+    this.fileSystemState = fileSystemState;
+    fileSystemState.register(this);
+  }
+
+  @Override
+  public synchronized void write(int b) throws IOException {
+    checkNotClosed();
+
+    file.writeLock().lock();
+    try {
+      if (append) {
+        pos = file.sizeWithoutLocking();
+      }
+      file.write(pos++, (byte) b);
+
+      file.updateModifiedTime();
+    } finally {
+      file.writeLock().unlock();
+    }
+  }
+
+  @Override
+  public void write(byte[] b) throws IOException {
+    writeInternal(b, 0, b.length);
+  }
+
+  @Override
+  public void write(byte[] b, int off, int len) throws IOException {
+    checkPositionIndexes(off, off + len, b.length);
+    writeInternal(b, off, len);
+  }
+
+  private synchronized void writeInternal(byte[] b, int off, int len) throws IOException {
+    checkNotClosed();
+
+    file.writeLock().lock();
+    try {
+      if (append) {
+        pos = file.sizeWithoutLocking();
+      }
+      pos += file.write(pos, b, off, len);
+
+      file.updateModifiedTime();
+    } finally {
+      file.writeLock().unlock();
+    }
+  }
+
+  @GuardedBy("this")
+  private void checkNotClosed() throws IOException {
+    if (file == null) {
+      throw new IOException("stream is closed");
+    }
+  }
+
+  @Override
+  public synchronized void close() throws IOException {
+    if (isOpen()) {
+      fileSystemState.unregister(this);
+      file.closed();
+
+      // file is set to null here and only here
+      file = null;
+    }
+  }
+
+  @GuardedBy("this")
+  private boolean isOpen() {
+    return file != null;
+  }
+}