pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / src / java / org / apache / lucene / util / OpenBitSetDISI.java

diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/util/OpenBitSetDISI.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/util/OpenBitSetDISI.java
new file mode 100644 (file)
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+++ b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/util/OpenBitSetDISI.java
@@ -0,0 +1,102 @@
+package org.apache.lucene.util;
+
+/**
+ * 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 org.apache.lucene.search.DocIdSetIterator;
+ 
+public class OpenBitSetDISI extends OpenBitSet {
+
+  /** Construct an OpenBitSetDISI with its bits set
+   * from the doc ids of the given DocIdSetIterator.
+   * Also give a maximum size one larger than the largest doc id for which a
+   * bit may ever be set on this OpenBitSetDISI.
+   */
+  public OpenBitSetDISI(DocIdSetIterator disi, int maxSize) throws IOException {
+    super(maxSize);
+    inPlaceOr(disi);
+  }
+
+  /** Construct an OpenBitSetDISI with no bits set, and a given maximum size
+   * one larger than the largest doc id for which a bit may ever be set
+   * on this OpenBitSetDISI.
+   */
+  public OpenBitSetDISI(int maxSize) {
+    super(maxSize);
+  }
+
+  /**
+   * Perform an inplace OR with the doc ids from a given DocIdSetIterator,
+   * setting the bit for each such doc id.
+   * These doc ids should be smaller than the maximum size passed to the
+   * constructor.
+   */   
+  public void inPlaceOr(DocIdSetIterator disi) throws IOException {
+    int doc;
+    long size = size();
+    while ((doc = disi.nextDoc()) < size) {
+      fastSet(doc);
+    }
+  }
+
+  /**
+   * Perform an inplace AND with the doc ids from a given DocIdSetIterator,
+   * leaving only the bits set for which the doc ids are in common.
+   * These doc ids should be smaller than the maximum size passed to the
+   * constructor.
+   */   
+  public void inPlaceAnd(DocIdSetIterator disi) throws IOException {
+    int bitSetDoc = nextSetBit(0);
+    int disiDoc;
+    while (bitSetDoc != -1 && (disiDoc = disi.advance(bitSetDoc)) != DocIdSetIterator.NO_MORE_DOCS) {
+      clear(bitSetDoc, disiDoc);
+      bitSetDoc = nextSetBit(disiDoc + 1);
+    }
+    if (bitSetDoc != -1) {
+      clear(bitSetDoc, size());
+    }
+  }
+
+  /**
+   * Perform an inplace NOT with the doc ids from a given DocIdSetIterator,
+   * clearing all the bits for each such doc id.
+   * These doc ids should be smaller than the maximum size passed to the
+   * constructor.
+   */   
+  public void inPlaceNot(DocIdSetIterator disi) throws IOException {
+    int doc;
+    long size = size();
+    while ((doc = disi.nextDoc()) < size) {
+      fastClear(doc);
+    }
+  }
+
+  /**
+   * Perform an inplace XOR with the doc ids from a given DocIdSetIterator,
+   * flipping all the bits for each such doc id.
+   * These doc ids should be smaller than the maximum size passed to the
+   * constructor.
+   */   
+  public void inPlaceXor(DocIdSetIterator disi) throws IOException {
+    int doc;
+    long size = size();
+    while ((doc = disi.nextDoc()) < size) {
+      fastFlip(doc);
+    }
+  }
+}