SOLR-10393: Adds UUID Streaming Evaluator

solr/CHANGES.txt

@@ -69,6 +69,8 @@ New Features
 
 * SOLR-10356: Adds basic math Streaming Evaluators (Dennis Gove)
 
+* SOLR-10393: Adds UUID Streaming Evaluator (Dennis Gove)
+
 Bug Fixes
 ----------------------
 * SOLR-9262: Connection and read timeouts are being ignored by UpdateShardHandler after SOLR-4509.

solr/core/src/java/org/apache/solr/handler/StreamHandler.java

@@ -67,6 +67,7 @@ import org.apache.solr.client.solrj.io.eval.SineEvaluator;
 import org.apache.solr.client.solrj.io.eval.SquareRootEvaluator;
 import org.apache.solr.client.solrj.io.eval.SubtractEvaluator;
 import org.apache.solr.client.solrj.io.eval.TangentEvaluator;
+import org.apache.solr.client.solrj.io.eval.UuidEvaluator;
 import org.apache.solr.client.solrj.io.graph.GatherNodesStream;
 import org.apache.solr.client.solrj.io.graph.ShortestPathStream;
 import org.apache.solr.client.solrj.io.ops.ConcatOperation;
@@ -277,6 +278,7 @@ public class StreamHandler extends RequestHandlerBase implements SolrCoreAware,
       .withFunctionName("sqrt", SquareRootEvaluator.class)
       .withFunctionName("cbrt", CubedRootEvaluator.class)
       .withFunctionName("coalesce", CoalesceEvaluator.class)
+      .withFunctionName("uuid", UuidEvaluator.class)
       
       // Conditional Stream Evaluators
       .withFunctionName("if", IfThenElseEvaluator.class)

solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/UuidEvaluator.java

@@ -0,0 +1,57 @@
+/*
+ * 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.solr.client.solrj.io.eval;
+
+import java.io.IOException;
+import java.util.UUID;
+
+import org.apache.solr.client.solrj.io.Tuple;
+import org.apache.solr.client.solrj.io.stream.expr.Explanation;
+import org.apache.solr.client.solrj.io.stream.expr.Explanation.ExpressionType;
+import org.apache.solr.client.solrj.io.stream.expr.StreamExpression;
+import org.apache.solr.client.solrj.io.stream.expr.StreamExpressionParameter;
+import org.apache.solr.client.solrj.io.stream.expr.StreamFactory;
+
+public class UuidEvaluator extends SimpleEvaluator {
+  protected static final long serialVersionUID = 1L;
+
+  public UuidEvaluator(StreamExpression expression, StreamFactory factory) throws IOException{
+    // no parameters are used
+  }
+
+  @Override
+  public UUID evaluate(Tuple tuple) throws IOException {
+    return UUID.randomUUID();
+  }
+
+  @Override
+  public StreamExpressionParameter toExpression(StreamFactory factory) throws IOException {
+    return new StreamExpression(factory.getFunctionName(getClass()));
+  }
+
+  @Override
+  public Explanation toExplanation(StreamFactory factory) throws IOException {
+    return new Explanation(nodeId.toString())
+      .withExpressionType(ExpressionType.EVALUATOR)
+      .withImplementingClass(getClass().getName())
+      .withExpression(toExpression(factory).toString());
+  }
+
+}

solr/solrj/src/test/org/apache/solr/client/solrj/io/stream/eval/UuidEvaluatorTest.java

@@ -0,0 +1,52 @@
+/*
+ * 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.solr.client.solrj.io.stream.eval;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+
+import org.apache.lucene.util.LuceneTestCase;
+import org.apache.solr.client.solrj.io.Tuple;
+import org.apache.solr.client.solrj.io.eval.StreamEvaluator;
+import org.apache.solr.client.solrj.io.eval.UuidEvaluator;
+import org.apache.solr.client.solrj.io.stream.expr.StreamFactory;
+import org.junit.Test;
+
+import junit.framework.Assert;
+
+public class UuidEvaluatorTest extends LuceneTestCase {
+
+  StreamFactory factory;
+  Map<String, Object> values;
+  
+  public UuidEvaluatorTest() {
+    super();
+    
+    factory = new StreamFactory()
+      .withFunctionName("uuid", UuidEvaluator.class);
+    values = new HashMap<String,Object>();
+  }
+    
+  @Test
+  public void isUuidType() throws Exception{
+    StreamEvaluator evaluator = factory.constructEvaluator("uuid()");
+    
+    Assert.assertTrue(evaluator.evaluate(null) instanceof UUID);
+    Assert.assertTrue(evaluator.evaluate(new Tuple(values)) instanceof UUID);
+  }    
+}