pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / src / java / org / apache / lucene / util / fst / NoOutputs.java

diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/util/fst/NoOutputs.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/util/fst/NoOutputs.java
new file mode 100644 (file)
index 0000000..1b1e97e
--- /dev/null
+++ b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/util/fst/NoOutputs.java
@@ -0,0 +1,96 @@
+package org.apache.lucene.util.fst;
+
+/**
+ * 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 org.apache.lucene.store.DataInput;
+import org.apache.lucene.store.DataOutput;
+
+/**
+ * Use this if you just want to build an FSA.
+ *
+ * @lucene.experimental
+ */
+
+public final class NoOutputs extends Outputs<Object> {
+
+  static final Object NO_OUTPUT = new Object() {
+    // NodeHash calls hashCode for this output; we fix this
+    // so we get deterministic hashing.
+    @Override
+    public int hashCode() {
+      return 42;
+    }
+
+    @Override
+    public boolean equals(Object other) {
+      return other == this;
+    }
+  };
+
+  private static final NoOutputs singleton = new NoOutputs();
+
+  private NoOutputs() {
+  }
+
+  public static NoOutputs getSingleton() {
+    return singleton;
+  }
+
+  @Override
+  public Object common(Object output1, Object output2) {
+    assert output1 == NO_OUTPUT;
+    assert output2 == NO_OUTPUT;
+    return NO_OUTPUT;
+  }
+
+  @Override
+  public Object subtract(Object output, Object inc) {
+    assert output == NO_OUTPUT;
+    assert inc == NO_OUTPUT;
+    return NO_OUTPUT;
+  }
+
+  @Override
+  public Object add(Object prefix, Object output) {
+    assert prefix == NO_OUTPUT: "got " + prefix;
+    assert output == NO_OUTPUT;
+    return NO_OUTPUT;
+  }
+
+  @Override
+  public void write(Object prefix, DataOutput out) {
+    //assert false;
+  }
+
+  @Override
+  public Object read(DataInput in) {
+    //assert false;
+    //return null;
+    return NO_OUTPUT;
+  }
+
+  @Override
+  public Object getNoOutput() {
+    return NO_OUTPUT;
+  }
+
+  @Override
+  public String outputToString(Object output) {
+    return "";
+  }
+}