pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / contrib / benchmark / src / java / org / apache / lucene / benchmark / byTask / feeds / RandomFacetSource.java

diff --git a/lucene-java-3.5.0/lucene/contrib/benchmark/src/java/org/apache/lucene/benchmark/byTask/feeds/RandomFacetSource.java b/lucene-java-3.5.0/lucene/contrib/benchmark/src/java/org/apache/lucene/benchmark/byTask/feeds/RandomFacetSource.java
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+++ b/lucene-java-3.5.0/lucene/contrib/benchmark/src/java/org/apache/lucene/benchmark/byTask/feeds/RandomFacetSource.java
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+package org.apache.lucene.benchmark.byTask.feeds;
+
+/**
+ * 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.IOException;
+import java.util.Random;
+
+import org.apache.lucene.benchmark.byTask.utils.Config;
+import org.apache.lucene.facet.index.CategoryContainer;
+import org.apache.lucene.facet.taxonomy.CategoryPath;
+
+/**
+ * Simple implementation of a random facet source
+ * <p>
+ * Supports the following parameters:
+ * <ul>
+ * <li><b>rand.seed</b> - defines the seed to initialize Random with (default: <b>13</b>).
+ * <li><b>max.doc.facets</b> - maximal #facets per doc (default: <b>10</b>).
+ *    Actual number of facets in a certain doc would be anything between 1 and that number.
+ * <li><b>max.facet.depth</b> - maximal #components in a facet (default: <b>3</b>).
+ *    Actual number of components in a certain facet would be anything between 1 and that number.
+ * </ul>
+ */
+public class RandomFacetSource extends FacetSource {
+
+  Random random;
+  
+  private int maxDocFacets = 10;
+  private int maxFacetDepth = 3;
+  private int maxValue = maxDocFacets * maxFacetDepth;
+  
+  @Override
+  public CategoryContainer getNextFacets(CategoryContainer facets) throws NoMoreDataException, IOException {
+    if (facets == null) {
+      facets = new CategoryContainer();
+    } else {
+      facets.clear();
+    }
+    int numFacets = 1 + random.nextInt(maxDocFacets-1); // at least one facet to each doc
+    for (int i=0; i<numFacets; i++) {
+      CategoryPath cp = new CategoryPath();
+      int depth = 1 + random.nextInt(maxFacetDepth-1); // depth 0 is not useful
+      for (int k=0; k<depth; k++) {
+        cp.add(Integer.toString(random.nextInt(maxValue)));
+        addItem();
+      }
+      facets.addCategory(cp);
+      addBytes(cp.toString().length()); // very rough approximation
+    }
+    return facets;
+  }
+
+  @Override
+  public void close() throws IOException {
+    // nothing to do here
+  }
+
+  @Override
+  public void setConfig(Config config) {
+    super.setConfig(config);
+    random = new Random(config.get("rand.seed", 13));
+    maxDocFacets = config.get("max.doc.facets", 200);
+    maxFacetDepth = config.get("max.facet.depth", 10);
+    maxValue = maxDocFacets * maxFacetDepth;
+  }
+}