SOLR-1367: simple callback for modifying the Document when using the SolrPluginUtils

git-svn-id: https://svn.apache.org/repos/asf/lucene/solr/trunk@805528 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -267,6 +267,8 @@ New Features
     HTMLStripStandardTokenizerFactory deprecated. To strip HTML tags, HTMLStripCharFilter can be used
     with an arbitrary Tokenizer. (koji)
 
+68. SOLR-1367: Added callback mechanism for converting DocList to SolrDocumentList in SolrPluginUtils (gsingers)  
+
 
 Optimizations
 ----------------------

src/java/org/apache/solr/util/SolrDocumentModifier.java

@@ -0,0 +1,37 @@
+package org.apache.solr.util;
+/**
+ * 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.solr.common.SolrDocument;
+
+
+/**
+ * Callback capability for modifying a SolrDocument in the {@link SolrPluginUtils#docListToSolrDocumentList(org.apache.solr.search.DocList, org.apache.solr.search.SolrIndexSearcher, java.util.Set, java.util.Map)}
+ *
+ * <p/>
+ * NOTE: This API is subject to change.
+ * Due to https://issues.apache.org/jira/browse/SOLR-1298 and https://issues.apache.org/jira/browse/SOLR-705, this interface may change in the future.
+ *
+ **/
+public interface SolrDocumentModifier {
+  /**
+   * Implement this method to allow for changes to be made to the {@link org.apache.solr.common.SolrDocument} in the {@link SolrPluginUtils#docListToSolrDocumentList(org.apache.solr.search.DocList, org.apache.solr.search.SolrIndexSearcher, java.util.Set, SolrDocumentModifier, java.util.Map)}
+   * call.
+   * @param doc The {@link org.apache.solr.common.SolrDocument} that can be modified.
+   */
+  void process(SolrDocument doc);
+}

src/java/org/apache/solr/util/SolrPluginUtils.java

@@ -887,6 +887,16 @@ public class SolrPluginUtils {
     }
   }
 
+
+  public static SolrDocumentList docListToSolrDocumentList(
+      DocList docs, 
+      SolrIndexSearcher searcher, 
+      Set<String> fields, 
+      Map<SolrDocument, Integer> ids ) throws IOException
+  {
+    return docListToSolrDocumentList(docs, searcher, fields, null, ids);
+  }
+
   /**
    * Convert a DocList to a SolrDocumentList
    *
@@ -896,6 +906,7 @@ public class SolrPluginUtils {
    * @param docs The {@link org.apache.solr.search.DocList} to convert
    * @param searcher The {@link org.apache.solr.search.SolrIndexSearcher} to use to load the docs from the Lucene index
    * @param fields The names of the Fields to load
+   * @param docModifier The {@link SolrDocumentModifier}
    * @param ids A map to store the ids of the docs
    * @return The new {@link org.apache.solr.common.SolrDocumentList} containing all the loaded docs
    * @throws java.io.IOException if there was a problem loading the docs
@@ -904,9 +915,8 @@ public class SolrPluginUtils {
   public static SolrDocumentList docListToSolrDocumentList(
       DocList docs,
       SolrIndexSearcher searcher,
-      Set<String> fields, 
-      Map<SolrDocument, Integer> ids ) throws IOException
-  {
+      Set<String> fields, SolrDocumentModifier docModifier,
+      Map<SolrDocument, Integer> ids ) throws IOException{
     DocumentBuilder db = new DocumentBuilder(searcher.getSchema());
     SolrDocumentList list = new SolrDocumentList();
     list.setNumFound(docs.matches());
@@ -929,6 +939,10 @@ public class SolrPluginUtils {
       } else {
         doc.addField("score", 0.0f);
       }
+
+      if (docModifier != null) {
+        docModifier.process(doc);
+      }
       list.add( doc );
 
       if( ids != null ) {
@@ -938,6 +952,7 @@ public class SolrPluginUtils {
     return list;
   }
 
+
   /**
    * Given a SolrQueryResponse replace the DocList if it is in the result.  
    * Otherwise add it to the response

src/test/org/apache/solr/util/SolrPluginUtilsTest.java

@@ -19,6 +19,14 @@ package org.apache.solr.util;
 
 import org.apache.solr.util.SolrPluginUtils;
 import org.apache.solr.util.SolrPluginUtils.DisjunctionMaxQueryParser;
+import org.apache.solr.core.SolrCore;
+import org.apache.solr.search.SolrIndexSearcher;
+import org.apache.solr.search.DocList;
+import org.apache.solr.search.DocSlice;
+import org.apache.solr.request.SolrQueryResponse;
+import org.apache.solr.common.util.*;
+import org.apache.solr.common.SolrDocument;
+import org.apache.solr.common.SolrDocumentList;
 
 import org.apache.lucene.index.Term;
 import org.apache.lucene.search.Query;
@@ -27,12 +35,15 @@ import org.apache.lucene.search.PhraseQuery;
 import org.apache.lucene.search.DisjunctionMaxQuery;
 import org.apache.lucene.search.BooleanQuery;
 import org.apache.lucene.search.BooleanClause;
+import org.apache.lucene.search.MatchAllDocsQuery;
 import org.apache.lucene.search.BooleanClause.Occur;
 
 import java.util.List;
 import java.util.Map;
 import java.util.HashMap;
 import java.util.Iterator;
+import java.util.Set;
+import java.util.HashSet;
 
 /**
  * Tests that the functions in SolrPluginUtils work as advertised.
@@ -42,6 +53,36 @@ public class SolrPluginUtilsTest extends AbstractSolrTestCase {
   public String getSchemaFile() { return "schema.xml"; }
   public String getSolrConfigFile() { return "solrconfig.xml"; }
 
+
+  public void testDocModifier() throws Exception {
+    assertU("", adoc("id", "3234", "val_t", "quick red fox"));
+    assertU("", adoc("id", "3235", "val_t", "quick green fox"));
+    assertU("", adoc("id", "3236", "val_t", "quick brown fox"));
+    commit();
+    SolrIndexSearcher srchr = h.getCore().getSearcher().get();
+    SolrIndexSearcher.QueryResult qr = new SolrIndexSearcher.QueryResult();
+    SolrIndexSearcher.QueryCommand cmd = new SolrIndexSearcher.QueryCommand();
+    cmd.setQuery(new MatchAllDocsQuery());
+    qr = srchr.search(qr, cmd);
+
+    DocList docs = qr.getDocList();
+    Set<String> fields = new HashSet<String>();
+    fields.add("val_t");
+
+    SolrDocumentModifier docMod = new SolrDocumentModifier() {
+      public void process(SolrDocument doc) {
+        doc.addField("junk", "foo");
+      }
+    };
+
+    SolrDocumentList list = SolrPluginUtils.docListToSolrDocumentList(docs, srchr, fields, docMod, null);
+    assertTrue("list Size: " + list.size() + " is not: " + docs.size(), list.size() == docs.size());
+    for (SolrDocument document : list) {
+      assertNotNull(document.get("junk"));
+    }
+
+  }
+
   public void testPartialEscape() {
 
     assertEquals("",pe(""));