pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / contrib / facet / src / java / org / apache / lucene / facet / taxonomy / writercache / cl2o / Cl2oTaxonomyWriterCache.java

diff --git a/lucene-java-3.5.0/lucene/contrib/facet/src/java/org/apache/lucene/facet/taxonomy/writercache/cl2o/Cl2oTaxonomyWriterCache.java b/lucene-java-3.5.0/lucene/contrib/facet/src/java/org/apache/lucene/facet/taxonomy/writercache/cl2o/Cl2oTaxonomyWriterCache.java
new file mode 100644 (file)
index 0000000..a9822f9
--- /dev/null
+++ b/lucene-java-3.5.0/lucene/contrib/facet/src/java/org/apache/lucene/facet/taxonomy/writercache/cl2o/Cl2oTaxonomyWriterCache.java
@@ -0,0 +1,82 @@
+package org.apache.lucene.facet.taxonomy.writercache.cl2o;
+
+import org.apache.lucene.facet.taxonomy.CategoryPath;
+import org.apache.lucene.facet.taxonomy.writercache.TaxonomyWriterCache;
+
+/**
+ * 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.
+ */
+
+/**
+ * {@link TaxonomyWriterCache} using {@link CompactLabelToOrdinal}. Although
+ * called cache, it maintains in memory all the mappings from category to
+ * ordinal, relying on that {@link CompactLabelToOrdinal} is an efficient
+ * mapping for this purpose.
+ * 
+ * @lucene.experimental
+ */
+public class Cl2oTaxonomyWriterCache implements TaxonomyWriterCache {  
+
+  private CompactLabelToOrdinal cache;
+
+  public Cl2oTaxonomyWriterCache(int initialCapcity, float loadFactor, int numHashArrays) {
+    this.cache = new CompactLabelToOrdinal(initialCapcity, loadFactor, numHashArrays);
+  }
+
+  public void close() {
+    cache=null;
+  }
+
+  public boolean hasRoom(int n) {
+    // This cache is unlimited, so we always have room for remembering more:
+    return true;
+  }
+
+  public int get(CategoryPath categoryPath) {
+    return cache.getOrdinal(categoryPath);
+  }
+
+  public int get(CategoryPath categoryPath, int length) {
+    if (length<0 || length>categoryPath.length()) {
+      length = categoryPath.length();
+    }
+    return cache.getOrdinal(categoryPath, length);
+  }
+
+  public boolean put(CategoryPath categoryPath, int ordinal) {
+    cache.addLabel(categoryPath, ordinal);
+    // Tell the caller we didn't clear part of the cache, so it doesn't
+    // have to flush its on-disk index now
+    return false;
+  }
+
+  public boolean put(CategoryPath categoryPath, int prefixLen, int ordinal) {
+    cache.addLabel(categoryPath, prefixLen, ordinal);
+    // Tell the caller we didn't clear part of the cache, so it doesn't
+    // have to flush its on-disk index now
+    return false;
+  }
+
+  /**
+   * Returns the number of bytes in memory used by this object.
+   * @return Number of bytes in memory used by this object.
+   */
+  public int getMemoryUsage() {
+    int memoryUsage = (this.cache == null) ? 0 : this.cache.getMemoryUsage();
+    return memoryUsage;
+  }
+
+}