forgot to add

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene4547@1436547 13f79535-47bb-0310-9956-ffa450edef68

lucene/core/src/java/org/apache/lucene/index/SortedDocValuesTermsEnum.java

@@ -0,0 +1,136 @@
+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 java.util.Comparator;
+
+import org.apache.lucene.util.Bits;
+import org.apache.lucene.util.BytesRef;
+
+/** Implements a {@link TermsEnum} wrapping a provided
+ * {@link SortedDocValues}. */
+
+public class SortedDocValuesTermsEnum extends TermsEnum {
+  private final SortedDocValues values;
+  private int currentOrd = -1;
+  private final BytesRef term = new BytesRef();
+
+  public SortedDocValuesTermsEnum(SortedDocValues values) {
+    this.values = values;
+  }
+
+  @Override
+  public SeekStatus seekCeil(BytesRef text, boolean useCache /* ignored */) throws IOException {
+    int ord = values.lookupTerm(text, term);
+    // nocommit >= 0!?
+    if (ord >= 0) {
+      currentOrd = ord;
+      term.offset = 0;
+      term.copyBytes(text);
+      return SeekStatus.FOUND;
+    } else {
+      currentOrd = -ord-1;
+      if (currentOrd == values.getValueCount()) {
+        return SeekStatus.END;
+      } else {
+        // nocommit hmm can we avoid this "extra" lookup?:
+        values.lookupOrd(currentOrd, term);
+        return SeekStatus.NOT_FOUND;
+      }
+    }
+  }
+
+  @Override
+  public boolean seekExact(BytesRef text, boolean useCache) throws IOException {
+    int ord = values.lookupTerm(text, term);
+    if (ord >= 0) {
+      term.copyBytes(text);
+      currentOrd = ord;
+      return true;
+    } else {
+      return false;
+    }
+  }
+
+  @Override
+  public void seekExact(long ord) throws IOException {
+    assert ord >= 0 && ord < values.getValueCount();
+    currentOrd = (int) ord;
+    values.lookupOrd(currentOrd, term);
+  }
+
+  @Override
+  public BytesRef next() throws IOException {
+    currentOrd++;
+    if (currentOrd >= values.getValueCount()) {
+      return null;
+    }
+    values.lookupOrd(currentOrd, term);
+    return term;
+  }
+
+  @Override
+  public BytesRef term() throws IOException {
+    return term;
+  }
+
+  @Override
+  public long ord() throws IOException {
+    return currentOrd;
+  }
+
+  @Override
+  public int docFreq() {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public long totalTermFreq() {
+    return -1;
+  }
+
+  @Override
+  public DocsEnum docs(Bits liveDocs, DocsEnum reuse, int flags) throws IOException {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public DocsAndPositionsEnum docsAndPositions(Bits liveDocs, DocsAndPositionsEnum reuse, int flags) throws IOException {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public Comparator<BytesRef> getComparator() {
+    return BytesRef.getUTF8SortedAsUnicodeComparator();
+  }
+
+  @Override
+  public void seekExact(BytesRef term, TermState state) throws IOException {
+    assert state != null && state instanceof OrdTermState;
+    this.seekExact(((OrdTermState)state).ord);
+  }
+
+  @Override
+  public TermState termState() throws IOException {
+    OrdTermState state = new OrdTermState();
+    state.ord = currentOrd;
+    return state;
+  }
+}
+