pylucene 3.5.0-3

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

diff --git a/lucene-java-3.5.0/lucene/contrib/instantiated/src/java/org/apache/lucene/store/instantiated/InstantiatedTermFreqVector.java b/lucene-java-3.5.0/lucene/contrib/instantiated/src/java/org/apache/lucene/store/instantiated/InstantiatedTermFreqVector.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/InstantiatedTermFreqVector.java
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+package org.apache.lucene.store.instantiated;
+
+import org.apache.lucene.index.TermFreqVector;
+
+import java.io.Serializable;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * 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.
+ */
+
+/**
+ * Vector space view of a document in an {@link InstantiatedIndexReader}.
+ *
+ * @see org.apache.lucene.index.TermFreqVector
+ */
+public class InstantiatedTermFreqVector
+    implements TermFreqVector, Serializable {
+
+  private static final long serialVersionUID = 1l;
+
+  private final List<InstantiatedTermDocumentInformation> termDocumentInformations;
+  private final String field;
+  private final String terms[];
+  private final int termFrequencies[];
+
+  public InstantiatedTermFreqVector(InstantiatedDocument document, String field) {
+    this.field = field;
+    termDocumentInformations = document.getVectorSpace().get(field);
+    terms = new String[termDocumentInformations.size()];
+    termFrequencies = new int[termDocumentInformations.size()];
+
+    for (int i = 0; i < termDocumentInformations.size(); i++) {
+      InstantiatedTermDocumentInformation termDocumentInformation = termDocumentInformations.get(i);
+      terms[i] = termDocumentInformation.getTerm().text();
+      termFrequencies[i] = termDocumentInformation.getTermPositions().length;
+    }
+  }
+
+  /**
+   * @return The number of the field this vector is associated with
+   */
+  public String getField() {
+    return field;
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append('{');
+    sb.append(field).append(": ");
+    if (terms != null) {
+      for (int i = 0; i < terms.length; i++) {
+        if (i > 0) sb.append(", ");
+        sb.append(terms[i]).append('/').append(termFrequencies[i]);
+      }
+    }
+    sb.append('}');
+
+    return sb.toString();
+  }
+
+  public int size() {
+    return terms == null ? 0 : terms.length;
+  }
+
+  public String[] getTerms() {
+    return terms;
+  }
+
+  public int[] getTermFrequencies() {
+    return termFrequencies;
+  }
+
+  public int indexOf(String termText) {
+    if (terms == null)
+      return -1;
+    int res = Arrays.binarySearch(terms, termText);
+    return res >= 0 ? res : -1;
+  }
+
+  public int[] indexesOf(String[] termNumbers, int start, int len) {
+    // TODO: there must be a more efficient way of doing this.
+    //       At least, we could advance the lower bound of the terms array
+    //       as we find valid indices. Also, it might be possible to leverage
+    //       this even more by starting in the middle of the termNumbers array
+    //       and thus dividing the terms array maybe in half with each found index.
+    int res[] = new int[len];
+
+    for (int i = 0; i < len; i++) {
+      res[i] = indexOf(termNumbers[start + i]);
+    }
+    return res;
+  }
+
+  public List<InstantiatedTermDocumentInformation> getTermDocumentInformations() {
+    return termDocumentInformations;
+  }
+
+}