pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / contrib / facet / src / java / org / apache / lucene / util / encoding / VInt8IntDecoder.java

diff --git a/lucene-java-3.5.0/lucene/contrib/facet/src/java/org/apache/lucene/util/encoding/VInt8IntDecoder.java b/lucene-java-3.5.0/lucene/contrib/facet/src/java/org/apache/lucene/util/encoding/VInt8IntDecoder.java
new file mode 100644 (file)
index 0000000..04cda37
--- /dev/null
+++ b/lucene-java-3.5.0/lucene/contrib/facet/src/java/org/apache/lucene/util/encoding/VInt8IntDecoder.java
@@ -0,0 +1,58 @@
+package org.apache.lucene.util.encoding;
+
+import java.io.IOException;
+
+/**
+ * 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.
+ */
+
+/**
+ * An {@link IntDecoder} which can decode values encoded by
+ * {@link VInt8IntEncoder}.
+ * 
+ * @lucene.experimental
+ */
+public class VInt8IntDecoder extends IntDecoder {
+
+  private boolean legalEOS = true;
+
+  @Override
+  public long decode() throws IOException {
+    int value = 0;
+    while (true) {
+      int first = in.read();
+      if (first < 0) {
+        if (!legalEOS) {
+          throw new IOException("Unexpected End-Of-Stream");
+        }
+        return EOS;
+      }
+      value |= first & 0x7F;
+      if ((first & 0x80) == 0) {
+        legalEOS = true;
+        return value;
+      }
+      legalEOS = false;
+      value <<= 7;
+    }
+  }
+
+  @Override
+  public String toString() {
+    return "VInt8";
+  }
+
+}