Update #0 - First Release

sources/main/java/com/google/common/io/CountingOutputStream.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2007 The Guava Authors
+ *
+ * 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.io;
+
+import java.io.FilterOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+
+import javax.annotation.Nullable;
+
+import com.google.common.annotations.Beta;
+
+/**
+ * An OutputStream that counts the number of bytes written.
+ *
+ * @author Chris Nokleberg
+ * @since 1.0
+ */
+@Beta
+public final class CountingOutputStream extends FilterOutputStream {
+
+	private long count;
+
+	/**
+	 * Wraps another output stream, counting the number of bytes written.
+	 *
+	 * @param out the output stream to be wrapped
+	 */
+	public CountingOutputStream(@Nullable OutputStream out) {
+		super(out);
+	}
+
+	/** Returns the number of bytes written. */
+	public long getCount() {
+		return count;
+	}
+
+	@Override
+	public void write(byte[] b, int off, int len) throws IOException {
+		out.write(b, off, len);
+		count += len;
+	}
+
+	@Override
+	public void write(int b) throws IOException {
+		out.write(b);
+		count++;
+	}
+
+	// Overriding close() because FilterOutputStream's close() method pre-JDK8 has
+	// bad behavior:
+	// it silently ignores any exception thrown by flush(). Instead, just close the
+	// delegate stream.
+	// It should flush itself if necessary.
+	@Override
+	public void close() throws IOException {
+		out.close();
+	}
+}