X-Git-Url: https://git.mdrn.pl/pylucene.git/blobdiff_plain/a2e61f0c04805cfcb8706176758d1283c7e3a55c..aaeed5504b982cf3545252ab528713250aa33eed:/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/index/SegmentTermDocs.java

diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/index/SegmentTermDocs.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/index/SegmentTermDocs.java
new file mode 100644
index 0000000..598eb05
--- /dev/null
+++ b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/index/SegmentTermDocs.java
@@ -0,0 +1,213 @@
+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.IOException;
+import org.apache.lucene.util.BitVector;
+import org.apache.lucene.index.FieldInfo.IndexOptions;
+import org.apache.lucene.store.IndexInput;
+
+class SegmentTermDocs implements TermDocs {
+  protected SegmentReader parent;
+  protected IndexInput freqStream;
+  protected int count;
+  protected int df;
+  protected BitVector deletedDocs;
+  int doc = 0;
+  int freq;
+
+  private int skipInterval;
+  private int maxSkipLevels;
+  private DefaultSkipListReader skipListReader;
+  
+  private long freqBasePointer;
+  private long proxBasePointer;
+
+  private long skipPointer;
+  private boolean haveSkipped;
+  
+  protected boolean currentFieldStoresPayloads;
+  protected IndexOptions indexOptions;
+  
+  protected SegmentTermDocs(SegmentReader parent) {
+    this.parent = parent;
+    this.freqStream = (IndexInput) parent.core.freqStream.clone();
+    synchronized (parent) {
+      this.deletedDocs = parent.deletedDocs;
+    }
+    this.skipInterval = parent.core.getTermsReader().getSkipInterval();
+    this.maxSkipLevels = parent.core.getTermsReader().getMaxSkipLevels();
+  }
+
+  public void seek(Term term) throws IOException {
+    TermInfo ti = parent.core.getTermsReader().get(term);
+    seek(ti, term);
+  }
+
+  public void seek(TermEnum termEnum) throws IOException {
+    TermInfo ti;
+    Term term;
+    
+    // use comparison of fieldinfos to verify that termEnum belongs to the same segment as this SegmentTermDocs
+    if (termEnum instanceof SegmentTermEnum && ((SegmentTermEnum) termEnum).fieldInfos == parent.core.fieldInfos) {        // optimized case
+      SegmentTermEnum segmentTermEnum = ((SegmentTermEnum) termEnum);
+      term = segmentTermEnum.term();
+      ti = segmentTermEnum.termInfo();
+    } else  {                                         // punt case
+      term = termEnum.term();
+      ti = parent.core.getTermsReader().get(term);
+    }
+    
+    seek(ti, term);
+  }
+
+  void seek(TermInfo ti, Term term) throws IOException {
+    count = 0;
+    FieldInfo fi = parent.core.fieldInfos.fieldInfo(term.field);
+    indexOptions = (fi != null) ? fi.indexOptions : IndexOptions.DOCS_AND_FREQS_AND_POSITIONS;
+    currentFieldStoresPayloads = (fi != null) ? fi.storePayloads : false;
+    if (ti == null) {
+      df = 0;
+    } else {
+      df = ti.docFreq;
+      doc = 0;
+      freqBasePointer = ti.freqPointer;
+      proxBasePointer = ti.proxPointer;
+      skipPointer = freqBasePointer + ti.skipOffset;
+      freqStream.seek(freqBasePointer);
+      haveSkipped = false;
+    }
+  }
+
+  public void close() throws IOException {
+    freqStream.close();
+    if (skipListReader != null)
+      skipListReader.close();
+  }
+
+  public final int doc() { return doc; }
+  public final int freq() { return freq; }
+
+  protected void skippingDoc() throws IOException {
+  }
+
+  public boolean next() throws IOException {
+    while (true) {
+      if (count == df)
+        return false;
+      final int docCode = freqStream.readVInt();
+      
+      if (indexOptions == IndexOptions.DOCS_ONLY) {
+        doc += docCode;
+        freq = 1;
+      } else {
+        doc += docCode >>> 1;       // shift off low bit
+        if ((docCode & 1) != 0)       // if low bit is set
+          freq = 1;         // freq is one
+        else
+          freq = freqStream.readVInt();     // else read freq
+      }
+      
+      count++;
+
+      if (deletedDocs == null || !deletedDocs.get(doc))
+        break;
+      skippingDoc();
+    }
+    return true;
+  }
+
+  /** Optimized implementation. */
+  public int read(final int[] docs, final int[] freqs)
+          throws IOException {
+    final int length = docs.length;
+    if (indexOptions == IndexOptions.DOCS_ONLY) {
+      return readNoTf(docs, freqs, length);
+    } else {
+      int i = 0;
+      while (i < length && count < df) {
+        // manually inlined call to next() for speed
+        final int docCode = freqStream.readVInt();
+        doc += docCode >>> 1;       // shift off low bit
+        if ((docCode & 1) != 0)       // if low bit is set
+          freq = 1;         // freq is one
+        else
+          freq = freqStream.readVInt();     // else read freq
+        count++;
+
+        if (deletedDocs == null || !deletedDocs.get(doc)) {
+          docs[i] = doc;
+          freqs[i] = freq;
+          ++i;
+        }
+      }
+      return i;
+    }
+  }
+
+  private final int readNoTf(final int[] docs, final int[] freqs, final int length) throws IOException {
+    int i = 0;
+    while (i < length && count < df) {
+      // manually inlined call to next() for speed
+      doc += freqStream.readVInt();       
+      count++;
+
+      if (deletedDocs == null || !deletedDocs.get(doc)) {
+        docs[i] = doc;
+        // Hardware freq to 1 when term freqs were not
+        // stored in the index
+        freqs[i] = 1;
+        ++i;
+      }
+    }
+    return i;
+  }
+ 
+  
+  /** Overridden by SegmentTermPositions to skip in prox stream. */
+  protected void skipProx(long proxPointer, int payloadLength) throws IOException {}
+
+  /** Optimized implementation. */
+  public boolean skipTo(int target) throws IOException {
+    if ((target - skipInterval) >= doc && df >= skipInterval) {                      // optimized case
+      if (skipListReader == null)
+        skipListReader = new DefaultSkipListReader((IndexInput) freqStream.clone(), maxSkipLevels, skipInterval); // lazily clone
+
+      if (!haveSkipped) {                          // lazily initialize skip stream
+        skipListReader.init(skipPointer, freqBasePointer, proxBasePointer, df, currentFieldStoresPayloads);
+        haveSkipped = true;
+      }
+
+      int newCount = skipListReader.skipTo(target); 
+      if (newCount > count) {
+        freqStream.seek(skipListReader.getFreqPointer());
+        skipProx(skipListReader.getProxPointer(), skipListReader.getPayloadLength());
+
+        doc = skipListReader.getDoc();
+        count = newCount;
+      }      
+    }
+
+    // done skipping, now just scan
+    do {
+      if (!next())
+        return false;
+    } while (target > doc);
+    return true;
+  }
+}