svn commit: r1561363 - /opennlp/trunk/opennlp-tools/src/main/java/opennlp/tools/cmdline/MarkableFileInputStream.java

[jo...@apache.org]

Author: joern
Date: Sat Jan 25 18:30:10 2014
New Revision: 1561363

URL: http://svn.apache.org/r1561363
Log:
OPENNLP-600 Added a File Input Stream which can be marked.

Added:
    opennlp/trunk/opennlp-tools/src/main/java/opennlp/tools/cmdline/MarkableFileInputStream.java

Added: opennlp/trunk/opennlp-tools/src/main/java/opennlp/tools/cmdline/MarkableFileInputStream.java
URL: http://svn.apache.org/viewvc/opennlp/trunk/opennlp-tools/src/main/java/opennlp/tools/cmdline/MarkableFileInputStream.java?rev=1561363&view=auto
==============================================================================
--- opennlp/trunk/opennlp-tools/src/main/java/opennlp/tools/cmdline/MarkableFileInputStream.java (added)
+++ opennlp/trunk/opennlp-tools/src/main/java/opennlp/tools/cmdline/MarkableFileInputStream.java Sat Jan 25 18:30:10 2014
@@ -0,0 +1,86 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 opennlp.tools.cmdline;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * A markable File Input Stream.
+ */
+public class MarkableFileInputStream extends InputStream {
+
+  private FileInputStream in;
+  
+  private long markedPosition = -1;
+  private IOException markException;
+  
+  MarkableFileInputStream(File file) throws FileNotFoundException {
+    in = new FileInputStream(file);
+  }
+  
+  @Override
+  public synchronized void mark(int readlimit) {
+    try {
+      markedPosition = in.getChannel().position();
+    } catch (IOException e) {
+      markedPosition = -1;
+    }
+  }
+  
+  @Override
+  public boolean markSupported() {
+    return true;
+  }
+  
+  private void throwMarkExceptionIfOccured() throws IOException {
+    if (markException != null) {
+      throw markException;
+    }
+  }
+  
+  @Override
+  public synchronized void reset() throws IOException {
+    throwMarkExceptionIfOccured();
+    
+    if (markedPosition >= 0) {
+      in.getChannel().position(markedPosition);
+    }
+    else {
+      throw new IOException("Stream has to be marked before it can be reset!");
+    }
+  }
+  
+  @Override
+  public int read() throws IOException {
+    return in.read();
+  }
+  
+  @Override
+  public int read(byte[] b) throws IOException {
+    return in.read(b);
+  }
+  
+  @Override
+  public int read(byte[] b, int off, int len) throws IOException {
+    return in.read(b, off, len);
+  }
+}