pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / contrib / instantiated / src / java / org / apache / lucene / store / instantiated / InstantiatedTermDocs.java

diff --git a/lucene-java-3.5.0/lucene/contrib/instantiated/src/java/org/apache/lucene/store/instantiated/InstantiatedTermDocs.java b/lucene-java-3.5.0/lucene/contrib/instantiated/src/java/org/apache/lucene/store/instantiated/InstantiatedTermDocs.java
new file mode 100644 (file)
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+++ b/lucene-java-3.5.0/lucene/contrib/instantiated/src/java/org/apache/lucene/store/instantiated/InstantiatedTermDocs.java
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+package org.apache.lucene.store.instantiated;
+
+/**
+ * Copyright 2006 The Apache Software Foundation
+ *
+ * Licensed 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 org.apache.lucene.index.Term;
+import org.apache.lucene.index.TermDocs;
+
+/**
+ * A {@link org.apache.lucene.index.TermDocs} navigating an {@link InstantiatedIndexReader}.
+ */
+public class InstantiatedTermDocs
+    implements TermDocs {
+
+  private final InstantiatedIndexReader reader;
+
+  public InstantiatedTermDocs(InstantiatedIndexReader reader) {
+    this.reader = reader;
+  }
+
+  private int currentDocumentIndex;
+  protected InstantiatedTermDocumentInformation currentDocumentInformation;
+  protected InstantiatedTerm currentTerm;
+
+
+  public void seek(Term term) {
+    currentTerm = reader.getIndex().findTerm(term);
+    currentDocumentIndex = -1;
+  }
+
+  public void seek(org.apache.lucene.index.TermEnum termEnum) {
+    seek(termEnum.term());
+  }
+
+
+  public int doc() {
+    return currentDocumentInformation.getDocument().getDocumentNumber();
+  }
+
+  public int freq() {
+    return currentDocumentInformation.getTermPositions().length;
+  }
+
+
+  public boolean next() {
+    if (currentTerm != null) {
+      currentDocumentIndex++;
+      if (currentDocumentIndex < currentTerm.getAssociatedDocuments().length) {
+        currentDocumentInformation = currentTerm.getAssociatedDocuments()[currentDocumentIndex];
+        if (reader.isDeleted(currentDocumentInformation.getDocument().getDocumentNumber())) {
+          return next();
+        } else {
+          return true;
+        }
+      } else {
+        // mimic SegmentTermDocs
+        currentDocumentIndex = currentTerm.getAssociatedDocuments().length -1;
+      }
+    }
+    return false;
+  }
+
+
+  public int read(int[] docs, int[] freqs) {
+    int i;
+    for (i = 0; i < docs.length; i++) {
+      if (!next()) {
+        break;
+      }
+      docs[i] = doc();
+      freqs[i] = freq();
+    }
+    return i;
+  }
+
+  /**
+   * Skips entries to the first beyond the current whose document number is
+   * greater than or equal to <i>target</i>. <p>Returns true if there is such
+   * an entry.  <p>Behaves as if written: <pre>
+   *   boolean skipTo(int target) {
+   *     do {
+   *       if (!next())
+   *        return false;
+   *     } while (target > doc());
+   *     return true;
+   *   }
+   * </pre>
+   * This implementation is considerably more efficient than that.
+   *
+   */
+  public boolean skipTo(int target) {
+    if (currentTerm == null) {
+      return false;
+    }
+    
+    if (currentDocumentIndex >= target) {
+      return next();
+    }
+
+    int startOffset = currentDocumentIndex >= 0 ? currentDocumentIndex : 0;
+    int pos = currentTerm.seekCeilingDocumentInformationIndex(target, startOffset);
+
+    if (pos == -1) {
+      // mimic SegmentTermDocs that positions at the last index
+      currentDocumentIndex = currentTerm.getAssociatedDocuments().length -1;
+      return false;
+    }
+
+    currentDocumentInformation = currentTerm.getAssociatedDocuments()[pos];
+    currentDocumentIndex = pos;
+    if (reader.hasDeletions() && reader.isDeleted(currentDocumentInformation.getDocument().getDocumentNumber())) {
+      return next();
+    } else {
+      return true;
+    }
+  }
+
+  /**
+   * Does nothing
+   */
+  public void close() {
+  }
+}