Fix #91 Local copying for files over same connection

src/main/java/com/xebialabs/overthere/spi/BaseOverthereFile.java

@@ -22,6 +22,8 @@
  */
 package com.xebialabs.overthere.spi;
 
+import com.xebialabs.overthere.CmdLine;
+import com.xebialabs.overthere.OperatingSystemFamily;
 import com.xebialabs.overthere.OverthereFile;
 import com.xebialabs.overthere.RuntimeIOException;
 import com.xebialabs.overthere.util.OverthereFileCopier;
@@ -73,9 +75,37 @@ public final void copyTo(final OverthereFile dest) {
     }
 
     protected void copyFrom(OverthereFile source) {
-        OverthereFileCopier.copy(source, this);
+        if (source.getConnection().equals(connection)) {
+            // Copying over same connection, let's do local
+            localCopyFrom(source);
+        } else {
+            OverthereFileCopier.copy(source, this);
+        }
     }
 
+    /**
+     * Copies this file or directory (recursively) to a (new) destination in the same connection.
+     * @param source The source file or directory
+     */
+    protected void localCopyFrom(OverthereFile source) {
+        OperatingSystemFamily hostOperatingSystem = source.getConnection().getHostOperatingSystem();
+        CmdLine cmdLine = new CmdLine();
+        switch (hostOperatingSystem) {
+            case WINDOWS:
+                cmdLine.addArgument("copy");
+                break;
+            case UNIX:
+            case ZOS:
+                cmdLine.addArgument("cp");
+                break;
+        }
+
+        cmdLine.addArgument(source.getPath()).addArgument(getPath());
+
+        source.getConnection().execute(cmdLine);
+    }
+
+
     /**
      * Subclasses MUST implement toString properly.
      */

src/test/java/com/xebialabs/overthere/OverthereConnectionItestBase.java

@@ -540,6 +540,20 @@ public void shouldWriteLargeFile() throws IOException {
         assertThat(largeFileContentsRead, equalTo(largeFileContentsWritten));
     }
 
+    @Test
+    public void shouldCopyRemoteFileAsToRemoteLocationOnSameConnection() throws IOException {
+        File largeFile = temp.newFile("large.dat");
+        byte[] largeFileContentsWritten = writeRandomBytes(largeFile, SMALL_FILE_SIZE);
+
+        OverthereFile remoteSmallFile = connection.getTempFile("small.dat");
+        LocalFile.valueOf(largeFile).copyTo(remoteSmallFile);
+
+        OverthereFile remoteSmallCopy = connection.getTempFile("copy-of-small.dat");
+
+        remoteSmallFile.copyTo(remoteSmallCopy);
+    }
+
+
     @Test
     public void shouldCopyLargeFile() throws IOException {
         File largeFile = temp.newFile("large.dat");