Add Java memory buffer transport implementation.

Wraps a TByteArrayOutputStream.


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665561 13f79535-47bb-0310-9956-ffa450edef68

lib/java/src/transport/TMemoryBuffer.java

@@ -0,0 +1,73 @@
+// Copyright (c) 2006- Facebook
+// Distributed under the Thrift Software License
+//
+// See accompanying file LICENSE or visit the Thrift site at:
+// http://developers.facebook.com/thrift/
+
+package com.facebook.thrift.transport;
+
+import com.facebook.thrift.TByteArrayOutputStream;
+import java.io.UnsupportedEncodingException;
+
+/**
+ * Memory buffer-based implementation of the TTransport interface.
+ *
+ * @author Chad Walters <chad@powerset.com>
+ */
+public class TMemoryBuffer extends TTransport {
+
+  /**
+   *
+   */
+  public TMemoryBuffer(int size) {
+    arr_ = new TByteArrayOutputStream(size);
+  }
+
+  @Override
+  public boolean isOpen() {
+    return true;
+  }
+
+  @Override
+  public void open() {
+    /* Do nothing */
+  }
+
+  @Override
+  public void close() {
+    /* Do nothing */
+  }
+
+  @Override
+  public int read(byte[] buf, int off, int len) {
+    byte[] src = arr_.get();
+    int amtToRead = (len > arr_.len() - pos_ ? arr_.len() - pos_ : len);
+    if (amtToRead > 0) {
+      System.arraycopy(src, pos_, buf, off, amtToRead);
+      pos_ += amtToRead;
+    }
+    return amtToRead;
+  }
+
+  @Override
+  public void write(byte[] buf, int off, int len) {
+    arr_.write(buf, off, len);
+  }
+
+  /**
+   * Output the contents of the memory buffer as a String, using the supplied
+   * encoding
+   * @param enc  the encoding to use
+   * @return the contents of the memory buffer as a String
+   */
+  public String toString(String enc) throws UnsupportedEncodingException {
+    return arr_.toString(enc);
+  }
+
+  // The contents of the buffer
+  private TByteArrayOutputStream arr_;
+
+  // Position to read next byte from
+  private int pos_;
+}
+