pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / src / java / org / apache / lucene / index / AbstractAllTermDocs.java

diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/index/AbstractAllTermDocs.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/index/AbstractAllTermDocs.java
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+/**
+ * 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.
+ */
+
+package org.apache.lucene.index;
+
+import java.io.IOException;
+
+/** Base class for enumerating all but deleted docs.
+ * 
+ * <p>NOTE: this class is meant only to be used internally
+ * by Lucene; it's only public so it can be shared across
+ * packages.  This means the API is freely subject to
+ * change, and, the class could be removed entirely, in any
+ * Lucene release.  Use directly at your own risk! */
+public abstract class AbstractAllTermDocs implements TermDocs {
+
+  protected int maxDoc;
+  protected int doc = -1;
+
+  protected AbstractAllTermDocs(int maxDoc) {
+    this.maxDoc = maxDoc;
+  }
+
+  public void seek(Term term) throws IOException {
+    if (term==null) {
+      doc = -1;
+    } else {
+      throw new UnsupportedOperationException();
+    }
+  }
+
+  public void seek(TermEnum termEnum) throws IOException {
+    throw new UnsupportedOperationException();
+  }
+
+  public int doc() {
+    return doc;
+  }
+
+  public int freq() {
+    return 1;
+  }
+
+  public boolean next() throws IOException {
+    return skipTo(doc+1);
+  }
+
+  public int read(int[] docs, int[] freqs) throws IOException {
+    final int length = docs.length;
+    int i = 0;
+    while (i < length && doc < maxDoc) {
+      if (!isDeleted(doc)) {
+        docs[i] = doc;
+        freqs[i] = 1;
+        ++i;
+      }
+      doc++;
+    }
+    return i;
+  }
+
+  public boolean skipTo(int target) throws IOException {
+    doc = target;
+    while (doc < maxDoc) {
+      if (!isDeleted(doc)) {
+        return true;
+      }
+      doc++;
+    }
+    return false;
+  }
+
+  public void close() throws IOException {
+  }
+
+  public abstract boolean isDeleted(int doc);
+}
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