pylucene 3.5.0-3

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

diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/util/fst/PairOutputs.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/util/fst/PairOutputs.java
new file mode 100644 (file)
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+++ b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/util/fst/PairOutputs.java
@@ -0,0 +1,118 @@
+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 java.io.IOException;
+
+import org.apache.lucene.store.DataInput;
+import org.apache.lucene.store.DataOutput;
+
+/**
+ * Pairs up two outputs into one.
+ *
+ * @lucene.experimental
+ */
+
+public class PairOutputs<A,B> extends Outputs<PairOutputs.Pair<A,B>> {
+
+  private final Pair<A,B> NO_OUTPUT;
+  private final Outputs<A> outputs1;
+  private final Outputs<B> outputs2;
+
+  public static class Pair<A,B> {
+    public final A output1;
+    public final B output2;
+
+    public Pair(A output1, B output2) {
+      this.output1 = output1;
+      this.output2 = output2;
+    }
+
+    @Override @SuppressWarnings("rawtypes")
+    public boolean equals(Object other) {
+      if (other == this) {
+        return true;
+      } else if (other instanceof Pair) {
+        Pair pair = (Pair) other;
+        return output1.equals(pair.output1) && output2.equals(pair.output2);
+      } else {
+        return false;
+      }
+    }
+
+    @Override
+    public int hashCode() {
+      return output1.hashCode() + output2.hashCode();
+    }
+  };
+
+  public PairOutputs(Outputs<A> outputs1, Outputs<B> outputs2) {
+    this.outputs1 = outputs1;
+    this.outputs2 = outputs2;
+    NO_OUTPUT = new Pair<A,B>(outputs1.getNoOutput(), outputs2.getNoOutput());
+  }
+  
+  public Pair<A,B> get(A output1, B output2) {
+    if (output1 == outputs1.getNoOutput() && output2 == outputs2.getNoOutput()) {
+      return NO_OUTPUT;
+    } else {
+      return new Pair<A,B>(output1, output2);
+    }
+  }
+ 
+  @Override
+  public Pair<A,B> common(Pair<A,B> pair1, Pair<A,B> pair2) {
+    return get(outputs1.common(pair1.output1, pair2.output1),
+               outputs2.common(pair1.output2, pair2.output2));
+  }
+
+  @Override
+  public Pair<A,B> subtract(Pair<A,B> output, Pair<A,B> inc) {
+    return get(outputs1.subtract(output.output1, inc.output1),
+               outputs2.subtract(output.output2, inc.output2));
+  }
+
+  @Override
+  public Pair<A,B> add(Pair<A,B> prefix, Pair<A,B> output) {
+    return get(outputs1.add(prefix.output1, output.output1),
+               outputs2.add(prefix.output2, output.output2));
+  }
+
+  @Override
+  public void write(Pair<A,B> output, DataOutput writer) throws IOException {
+    outputs1.write(output.output1, writer);
+    outputs2.write(output.output2, writer);
+  }
+
+  @Override
+  public Pair<A,B> read(DataInput in) throws IOException {
+    A output1 = outputs1.read(in);
+    B output2 = outputs2.read(in);
+    return get(output1, output2);
+  }
+
+  @Override
+  public Pair<A,B> getNoOutput() {
+    return NO_OUTPUT;
+  }
+
+  @Override
+  public String outputToString(Pair<A,B> output) {
+    return "<pair:" + outputs1.outputToString(output.output1) + "," + outputs2.outputToString(output.output2) + ">";
+  }
+}