pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / src / java / org / apache / lucene / store / RAMFile.java

diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/store/RAMFile.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/store/RAMFile.java
new file mode 100644 (file)
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+++ b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/store/RAMFile.java
@@ -0,0 +1,96 @@
+package org.apache.lucene.store;
+
+/**
+ * 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.
+ */
+
+import java.util.ArrayList;
+import java.io.Serializable;
+
+/** @lucene.internal */
+public class RAMFile implements Serializable {
+
+  private static final long serialVersionUID = 1l;
+
+  protected ArrayList<byte[]> buffers = new ArrayList<byte[]>();
+  long length;
+  RAMDirectory directory;
+  protected long sizeInBytes;
+
+  // This is publicly modifiable via Directory.touchFile(), so direct access not supported
+  private long lastModified = System.currentTimeMillis();
+
+  // File used as buffer, in no RAMDirectory
+  public RAMFile() {}
+  
+  RAMFile(RAMDirectory directory) {
+    this.directory = directory;
+  }
+
+  // For non-stream access from thread that might be concurrent with writing
+  public synchronized long getLength() {
+    return length;
+  }
+
+  protected synchronized void setLength(long length) {
+    this.length = length;
+  }
+
+  // For non-stream access from thread that might be concurrent with writing
+  public synchronized long getLastModified() {
+    return lastModified;
+  }
+
+  protected synchronized void setLastModified(long lastModified) {
+    this.lastModified = lastModified;
+  }
+
+  protected final byte[] addBuffer(int size) {
+    byte[] buffer = newBuffer(size);
+    synchronized(this) {
+      buffers.add(buffer);
+      sizeInBytes += size;
+    }
+
+    if (directory != null) {
+      directory.sizeInBytes.getAndAdd(size);
+    }
+    return buffer;
+  }
+
+  protected final synchronized byte[] getBuffer(int index) {
+    return buffers.get(index);
+  }
+
+  protected final synchronized int numBuffers() {
+    return buffers.size();
+  }
+
+  /**
+   * Expert: allocate a new buffer. 
+   * Subclasses can allocate differently. 
+   * @param size size of allocated buffer.
+   * @return allocated buffer.
+   */
+  protected byte[] newBuffer(int size) {
+    return new byte[size];
+  }
+
+  public synchronized long getSizeInBytes() {
+    return sizeInBytes;
+  }
+  
+}