pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / src / java / org / apache / lucene / index / IndexFileNameFilter.java

diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/index/IndexFileNameFilter.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/index/IndexFileNameFilter.java
new file mode 100644 (file)
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--- /dev/null
+++ b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/index/IndexFileNameFilter.java
@@ -0,0 +1,94 @@
+package org.apache.lucene.index;
+
+/**
+ * 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.io.File;
+import java.io.FilenameFilter;
+import java.util.HashSet;
+
+/**
+ * Filename filter that accept filenames and extensions only created by Lucene.
+ *
+ * @lucene.internal
+ */
+public class IndexFileNameFilter implements FilenameFilter {
+
+  private static IndexFileNameFilter singleton = new IndexFileNameFilter();
+  private HashSet<String> extensions;
+  private HashSet<String> extensionsInCFS;
+
+  // Prevent instantiation.
+  private IndexFileNameFilter() {
+    extensions = new HashSet<String>();
+    for (String ext : IndexFileNames.INDEX_EXTENSIONS) {
+      extensions.add(ext);
+    }
+    extensionsInCFS = new HashSet<String>();
+    for (String ext : IndexFileNames.INDEX_EXTENSIONS_IN_COMPOUND_FILE) {
+      extensionsInCFS.add(ext);
+    }
+  }
+
+  /* (non-Javadoc)
+   * @see java.io.FilenameFilter#accept(java.io.File, java.lang.String)
+   */
+  public boolean accept(File dir, String name) {
+    int i = name.lastIndexOf('.');
+    if (i != -1) {
+      String extension = name.substring(1+i);
+      if (extensions.contains(extension)) {
+        return true;
+      } else if (extension.startsWith("f") &&
+                 extension.matches("f\\d+")) {
+        return true;
+      } else if (extension.startsWith("s") &&
+                 extension.matches("s\\d+")) {
+        return true;
+      }
+    } else {
+      if (name.equals(IndexFileNames.DELETABLE)) return true;
+      else if (name.startsWith(IndexFileNames.SEGMENTS)) return true;
+    }
+    return false;
+  }
+
+  /**
+   * Returns true if this is a file that would be contained
+   * in a CFS file.  This function should only be called on
+   * files that pass the above "accept" (ie, are already
+   * known to be a Lucene index file).
+   */
+  public boolean isCFSFile(String name) {
+    int i = name.lastIndexOf('.');
+    if (i != -1) {
+      String extension = name.substring(1+i);
+      if (extensionsInCFS.contains(extension)) {
+        return true;
+      }
+      if (extension.startsWith("f") &&
+          extension.matches("f\\d+")) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  public static IndexFileNameFilter getFilter() {
+    return singleton;
+  }
+}