SOLR-13104: Add natural and repeat Stream Evaluators

solr/solrj/src/java/org/apache/solr/client/solrj/io/Lang.java

@@ -279,6 +279,8 @@ public class Lang {
         .withFunctionName("pivot", PivotEvaluator.class)
         .withFunctionName("ltrim", LeftShiftEvaluator.class)
         .withFunctionName("rtrim", RightShiftEvaluator.class)
+        .withFunctionName("repeat", RepeatEvaluator.class)
+        .withFunctionName("natural", NaturalEvaluator.class)
 
         // Boolean Stream Evaluators
 

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

@@ -0,0 +1,47 @@
+/*
+ * 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.ArrayList;
+import java.util.List;
+import java.util.Locale;
+
+import org.apache.solr.client.solrj.io.stream.expr.StreamExpression;
+import org.apache.solr.client.solrj.io.stream.expr.StreamFactory;
+
+public class NaturalEvaluator extends RecursiveNumericEvaluator implements OneValueWorker {
+  protected static final long serialVersionUID = 1L;
+
+  public NaturalEvaluator(StreamExpression expression, StreamFactory factory) throws IOException{
+    super(expression, factory);
+
+    if(1 != containedEvaluators.size()){
+      throw new IOException(String.format(Locale.ROOT,"Invalid expression %s - expecting exactly 1 value but found %d",expression,containedEvaluators.size()));
+    }
+  }
+
+  @Override
+  public Object doWork(Object value){
+    int natural = ((Number)value).intValue();
+    List<Number> naturals = new ArrayList();
+    for(int i=0; i<natural; i++) {
+      naturals.add(i);
+    }
+    return naturals;
+  }
+}

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

@@ -0,0 +1,48 @@
+/*
+ * 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.ArrayList;
+import java.util.List;
+import java.util.Locale;
+
+import org.apache.solr.client.solrj.io.stream.expr.StreamExpression;
+import org.apache.solr.client.solrj.io.stream.expr.StreamFactory;
+
+public class RepeatEvaluator extends RecursiveNumericEvaluator implements TwoValueWorker {
+  protected static final long serialVersionUID = 1L;
+
+  public RepeatEvaluator(StreamExpression expression, StreamFactory factory) throws IOException{
+    super(expression, factory);
+
+    if(2 != containedEvaluators.size()){
+      throw new IOException(String.format(Locale.ROOT,"Invalid expression %s - expecting exactly 2 values but found %d",expression,containedEvaluators.size()));
+    }
+  }
+
+  @Override
+  public Object doWork(Object value1, Object value2){
+    double d  = ((Number)value1).doubleValue();
+    int size = ((Number)value2).intValue();
+    List<Number> repeated = new ArrayList();
+    for(int i=0; i<size; i++) {
+      repeated.add(d);
+    }
+    return repeated;
+  }
+}

solr/solrj/src/test/org/apache/solr/client/solrj/io/TestLang.java

@@ -74,7 +74,7 @@ public class TestLang extends LuceneTestCase {
       "convexHull", "getVertices", "getBaryCenter", "getArea", "getBoundarySize","oscillate",
       "getAmplitude", "getPhase", "getAngularFrequency", "enclosingDisk", "getCenter", "getRadius",
       "getSupportPoints", "pairSort", "log10", "plist", "recip", "pivot", "ltrim", "rtrim", "export",
-      "zplot"};
+      "zplot", "natural", "repeat"};
 
   @Test
   public void testLang() {

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

@@ -1225,6 +1225,52 @@ public class MathExpressionTest extends SolrCloudTestCase {
     assertEquals(out.get(5).intValue(), 1);
   }
 
+  @Test
+  public void testNatural() throws Exception {
+    String cexpr = "natural(6)";
+    ModifiableSolrParams paramsLoc = new ModifiableSolrParams();
+    paramsLoc.set("expr", cexpr);
+    paramsLoc.set("qt", "/stream");
+    String url = cluster.getJettySolrRunners().get(0).getBaseUrl().toString()+"/"+COLLECTIONORALIAS;
+    TupleStream solrStream = new SolrStream(url, paramsLoc);
+    StreamContext context = new StreamContext();
+    solrStream.setStreamContext(context);
+    List<Tuple> tuples = getTuples(solrStream);
+    assertTrue(tuples.size() == 1);
+    List<Number> out = (List<Number>)tuples.get(0).get("return-value");
+    assertEquals(out.size(), 6);
+    assertEquals(out.get(0).intValue(), 0);
+    assertEquals(out.get(1).intValue(), 1);
+    assertEquals(out.get(2).intValue(), 2);
+    assertEquals(out.get(3).intValue(), 3);
+    assertEquals(out.get(4).intValue(), 4);
+    assertEquals(out.get(5).intValue(), 5);
+  }
+
+
+  @Test
+  public void testRepeat() throws Exception {
+    String cexpr = "repeat(6.5, 6)";
+    ModifiableSolrParams paramsLoc = new ModifiableSolrParams();
+    paramsLoc.set("expr", cexpr);
+    paramsLoc.set("qt", "/stream");
+    String url = cluster.getJettySolrRunners().get(0).getBaseUrl().toString()+"/"+COLLECTIONORALIAS;
+    TupleStream solrStream = new SolrStream(url, paramsLoc);
+    StreamContext context = new StreamContext();
+    solrStream.setStreamContext(context);
+    List<Tuple> tuples = getTuples(solrStream);
+    assertTrue(tuples.size() == 1);
+    List<Number> out = (List<Number>)tuples.get(0).get("return-value");
+    assertEquals(out.size(), 6);
+    assertEquals(out.get(0).doubleValue(), 6.5, 0);
+    assertEquals(out.get(1).doubleValue(), 6.5, 0);
+    assertEquals(out.get(2).doubleValue(), 6.5, 0);
+    assertEquals(out.get(3).doubleValue(), 6.5, 0);
+    assertEquals(out.get(4).doubleValue(), 6.5, 0);
+    assertEquals(out.get(5).doubleValue(), 6.5, 0);
+  }
+
+
   @Test
   public void testLtrim() throws Exception {
     String cexpr = "ltrim(array(1,2,3,4,5,6), 2)";