some merge mapping work, tests...

modules/elasticsearch/src/main/java/org/elasticsearch/index/mapper/DocumentMapper.java

@@ -111,6 +111,9 @@ public interface DocumentMapper {
         public MergeFlags() {
         }
 
+        /**
+         * A simulation run, don't perform actual modifications to the mapping.
+         */
         public boolean simulate() {
             return simulate;
         }

modules/elasticsearch/src/main/java/org/elasticsearch/index/mapper/FieldMapper.java

@@ -137,12 +137,18 @@ public interface FieldMapper<T> {
      */
     String indexedValue(T value);
 
+    /**
+     * Should the field query {@link #fieldQuery(String)} be used when detecting this
+     * field in query string.
+     */
     boolean useFieldQueryWithQueryString();
 
     Query fieldQuery(String value);
 
     Filter fieldFilter(String value);
 
+    void merge(FieldMapper mergeWith, DocumentMapper.MergeFlags mergeFlags) throws MergeMappingException;
+
     /**
      * Constructs a range query based on the mapper.
      */

modules/elasticsearch/src/main/java/org/elasticsearch/index/mapper/json/JsonBoostFieldMapper.java

@@ -27,13 +27,16 @@ import org.codehaus.jackson.JsonToken;
 import org.elasticsearch.index.analysis.NamedAnalyzer;
 import org.elasticsearch.index.analysis.NumericFloatAnalyzer;
 import org.elasticsearch.index.mapper.BoostFieldMapper;
+import org.elasticsearch.index.mapper.DocumentMapper;
+import org.elasticsearch.index.mapper.FieldMapper;
+import org.elasticsearch.index.mapper.MergeMappingException;
 import org.elasticsearch.util.Numbers;
 import org.elasticsearch.util.json.JsonBuilder;
 
 import java.io.IOException;
 
 /**
- * @author kimchy (Shay Banon)
+ * @author kimchy (shay.banon)
  */
 public class JsonBoostFieldMapper extends JsonNumberFieldMapper<Float> implements BoostFieldMapper {
 
@@ -179,4 +182,8 @@ public class JsonBoostFieldMapper extends JsonNumberFieldMapper<Float> implement
         }
         builder.endObject();
     }
+
+    @Override public void merge(FieldMapper mergeWith, DocumentMapper.MergeFlags mergeFlags) throws MergeMappingException {
+        // do nothing here, no merging, but also no exception
+    }
 }

modules/elasticsearch/src/main/java/org/elasticsearch/index/mapper/json/JsonDocumentMapper.java

@@ -349,7 +349,7 @@ public class JsonDocumentMapper implements DocumentMapper, ToJson {
 
     @Override public synchronized void merge(DocumentMapper mergeWith, MergeFlags mergeFlags) throws MergeMappingException {
         JsonDocumentMapper jsonMergeWith = (JsonDocumentMapper) mergeWith;
-        rootObjectMapper.mergeMapping(jsonMergeWith.rootObjectMapper, mergeFlags);
+        rootObjectMapper.mergeMapping(this, jsonMergeWith.rootObjectMapper, mergeFlags);
         if (!mergeFlags.simulate()) {
             // update the source to the merged one
             mappingSource = buildSource();

modules/elasticsearch/src/main/java/org/elasticsearch/index/mapper/json/JsonFieldMapper.java

@@ -25,8 +25,10 @@ import org.apache.lucene.document.Fieldable;
 import org.apache.lucene.index.Term;
 import org.apache.lucene.search.*;
 import org.elasticsearch.index.analysis.NamedAnalyzer;
+import org.elasticsearch.index.mapper.DocumentMapper;
 import org.elasticsearch.index.mapper.FieldMapper;
 import org.elasticsearch.index.mapper.FieldMapperListener;
+import org.elasticsearch.index.mapper.MergeMappingException;
 import org.elasticsearch.util.json.JsonBuilder;
 import org.elasticsearch.util.lucene.search.TermFilter;
 
@@ -319,6 +321,13 @@ public abstract class JsonFieldMapper<T> implements FieldMapper<T>, JsonMapper {
                 includeLower, includeUpper);
     }
 
+    @Override public void merge(FieldMapper mergeWith, DocumentMapper.MergeFlags mergeFlags) throws MergeMappingException {
+        if (mergeFlags.ignoreDuplicates()) {
+            return;
+        }
+        throw new MergeMappingException("Mapper [" + names.fullName() + "] exists, can't merge");
+    }
+
     @Override public int sortType() {
         return SortField.STRING;
     }

modules/elasticsearch/src/main/java/org/elasticsearch/index/mapper/json/JsonIdFieldMapper.java

@@ -22,9 +22,7 @@ package org.elasticsearch.index.mapper.json;
 import org.apache.lucene.document.Document;
 import org.apache.lucene.document.Field;
 import org.apache.lucene.document.Fieldable;
-import org.elasticsearch.index.mapper.FieldMapperListener;
-import org.elasticsearch.index.mapper.IdFieldMapper;
-import org.elasticsearch.index.mapper.MapperParsingException;
+import org.elasticsearch.index.mapper.*;
 import org.elasticsearch.util.json.JsonBuilder;
 import org.elasticsearch.util.lucene.Lucene;
 
@@ -124,4 +122,8 @@ public class JsonIdFieldMapper extends JsonFieldMapper<String> implements IdFiel
     @Override public void toJson(JsonBuilder builder, Params params) throws IOException {
         // for now, don't output it at all
     }
+
+    @Override public void merge(FieldMapper mergeWith, DocumentMapper.MergeFlags mergeFlags) throws MergeMappingException {
+        // do nothing here, no merging, but also no exception
+    }
 }

modules/elasticsearch/src/main/java/org/elasticsearch/index/mapper/json/JsonObjectMapper.java

@@ -337,7 +337,7 @@ public class JsonObjectMapper implements JsonMapper {
         }
     }
 
-    public void mergeMapping(JsonObjectMapper mergeWith, DocumentMapper.MergeFlags mergeFlags) throws MergeMappingException {
+    public void mergeMapping(JsonDocumentMapper docMapper, JsonObjectMapper mergeWith, DocumentMapper.MergeFlags mergeFlags) throws MergeMappingException {
         synchronized (mutex) {
             for (JsonMapper mapper : mergeWith.mappers.values()) {
                 if (mapper instanceof JsonObjectMapper) {
@@ -347,26 +347,23 @@ public class JsonObjectMapper implements JsonMapper {
                         if (!(mergeIntoMapper instanceof JsonObjectMapper)) {
                             throw new MergeMappingException("Can't merge an object mapping [" + mergeWithMapper.name() + "] into a non object mapper");
                         }
-                        ((JsonObjectMapper) mergeIntoMapper).mergeMapping(mergeWithMapper, mergeFlags);
+                        ((JsonObjectMapper) mergeIntoMapper).mergeMapping(docMapper, mergeWithMapper, mergeFlags);
                     } else {
                         if (!mergeFlags.simulate()) {
                             putMapper(mergeWithMapper);
                         }
                     }
                 } else {
+                    JsonFieldMapper mergeWithMapper = (JsonFieldMapper) mapper;
+                    JsonFieldMapper mergeIntoMapper = (JsonFieldMapper) mappers.get(mergeWithMapper.name());
                     // not an object mapper, bail if we have it, otherwise, add
                     // we might get fancy later on and allow per field mapper merge
-                    if (mappers.containsKey(mapper.name())) {
-                        if (mappers.get(mapper.name()) instanceof InternalMapper) {
-                            // simple ignore internal mappings
-                        } else {
-                            if (!mergeFlags.ignoreDuplicates()) {
-                                throw new MergeMappingException("Mapper [" + mapper.name() + "] exists, can't merge");
-                            }
-                        }
+                    if (mergeIntoMapper != null) {
+                        mergeIntoMapper.merge(mergeWithMapper, mergeFlags);
                     } else {
                         if (!mergeFlags.simulate()) {
-                            putMapper(mapper);
+                            putMapper(mergeWithMapper);
+                            docMapper.addFieldMapper(mergeWithMapper);
                         }
                     }
                 }

modules/elasticsearch/src/main/java/org/elasticsearch/index/mapper/json/JsonSourceFieldMapper.java

@@ -20,6 +20,9 @@
 package org.elasticsearch.index.mapper.json;
 
 import org.apache.lucene.document.*;
+import org.elasticsearch.index.mapper.DocumentMapper;
+import org.elasticsearch.index.mapper.FieldMapper;
+import org.elasticsearch.index.mapper.MergeMappingException;
 import org.elasticsearch.index.mapper.SourceFieldMapper;
 import org.elasticsearch.util.json.JsonBuilder;
 import org.elasticsearch.util.lucene.Lucene;
@@ -131,4 +134,8 @@ public class JsonSourceFieldMapper extends JsonFieldMapper<byte[]> implements So
     @Override public void toJson(JsonBuilder builder, Params params) throws IOException {
         // for now, don't output it at all
     }
+
+    @Override public void merge(FieldMapper mergeWith, DocumentMapper.MergeFlags mergeFlags) throws MergeMappingException {
+        // do nothing here, no merging, but also no exception
+    }
 }

modules/elasticsearch/src/main/java/org/elasticsearch/index/mapper/json/JsonTypeFieldMapper.java

@@ -23,6 +23,9 @@ import org.apache.lucene.document.Document;
 import org.apache.lucene.document.Field;
 import org.apache.lucene.document.Fieldable;
 import org.apache.lucene.index.Term;
+import org.elasticsearch.index.mapper.DocumentMapper;
+import org.elasticsearch.index.mapper.FieldMapper;
+import org.elasticsearch.index.mapper.MergeMappingException;
 import org.elasticsearch.index.mapper.TypeFieldMapper;
 import org.elasticsearch.util.json.JsonBuilder;
 import org.elasticsearch.util.lucene.Lucene;
@@ -108,4 +111,8 @@ public class JsonTypeFieldMapper extends JsonFieldMapper<String> implements Type
     @Override public void toJson(JsonBuilder builder, Params params) throws IOException {
         // for now, don't output it at all
     }
+
+    @Override public void merge(FieldMapper mergeWith, DocumentMapper.MergeFlags mergeFlags) throws MergeMappingException {
+        // do nothing here, no merging, but also no exception
+    }
 }

modules/elasticsearch/src/main/java/org/elasticsearch/index/mapper/json/JsonUidFieldMapper.java

@@ -22,9 +22,7 @@ package org.elasticsearch.index.mapper.json;
 import org.apache.lucene.document.Field;
 import org.apache.lucene.document.Fieldable;
 import org.apache.lucene.index.Term;
-import org.elasticsearch.index.mapper.MapperParsingException;
-import org.elasticsearch.index.mapper.Uid;
-import org.elasticsearch.index.mapper.UidFieldMapper;
+import org.elasticsearch.index.mapper.*;
 import org.elasticsearch.util.json.JsonBuilder;
 import org.elasticsearch.util.lucene.Lucene;
 
@@ -106,4 +104,8 @@ public class JsonUidFieldMapper extends JsonFieldMapper<Uid> implements UidField
     @Override public void toJson(JsonBuilder builder, Params params) throws IOException {
         // for now, don't output it at all
     }
+
+    @Override public void merge(FieldMapper mergeWith, DocumentMapper.MergeFlags mergeFlags) throws MergeMappingException {
+        // do nothing here, no merging, but also no exception
+    }
 }

modules/elasticsearch/src/test/java/org/elasticsearch/index/mapper/json/merge/test1/Test1MergeMapperTests.java

@@ -0,0 +1,60 @@
+/*
+ * Licensed to Elastic Search and Shay Banon under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. Elastic Search 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.elasticsearch.index.mapper.json.merge.test1;
+
+import org.elasticsearch.index.Index;
+import org.elasticsearch.index.analysis.AnalysisService;
+import org.elasticsearch.index.mapper.MergeMappingException;
+import org.elasticsearch.index.mapper.json.JsonDocumentMapper;
+import org.elasticsearch.index.mapper.json.JsonDocumentMapperParser;
+import org.testng.annotations.Test;
+
+import static org.elasticsearch.index.mapper.DocumentMapper.MergeFlags.*;
+import static org.elasticsearch.util.io.Streams.*;
+import static org.hamcrest.MatcherAssert.*;
+import static org.hamcrest.Matchers.*;
+
+/**
+ * @author kimchy (shay.banon)
+ */
+@Test
+public class Test1MergeMapperTests {
+
+    @Test public void test1Merge() throws Exception {
+        String stage1Mapping = copyToStringFromClasspath("/org/elasticsearch/index/mapper/json/merge/test1/stage1.json");
+        JsonDocumentMapper stage1 = (JsonDocumentMapper) new JsonDocumentMapperParser(new AnalysisService(new Index("test"))).parse(stage1Mapping);
+        String stage2Mapping = copyToStringFromClasspath("/org/elasticsearch/index/mapper/json/merge/test1/stage2.json");
+        JsonDocumentMapper stage2 = (JsonDocumentMapper) new JsonDocumentMapperParser(new AnalysisService(new Index("test"))).parse(stage2Mapping);
+        try {
+            stage1.merge(stage2, mergeFlags().simulate(true));
+            assert false : "can't change field from number to type";
+        } catch (MergeMappingException e) {
+            // all is well
+        }
+
+        // now, test with ignore duplicates
+        stage1.merge(stage2, mergeFlags().ignoreDuplicates(true).simulate(true));
+        // since we are simulating, we should not have the age mapping
+        assertThat(stage1.mappers().smartName("age"), nullValue());
+        // now merge, ignore duplicates and don't simulate
+        stage1.merge(stage2, mergeFlags().ignoreDuplicates(true).simulate(false));
+        assertThat(stage1.mappers().smartName("age"), notNullValue());
+    }
+}

modules/elasticsearch/src/test/java/org/elasticsearch/index/mapper/json/merge/test1/stage1.json

@@ -0,0 +1,7 @@
+{
+    person : {
+        properties : {
+            name : {type : "string"}
+        }
+    }
+}

modules/elasticsearch/src/test/java/org/elasticsearch/index/mapper/json/merge/test1/stage2.json

@@ -0,0 +1,8 @@
+{
+    person : {
+        properties : {
+            name : {type : "integer"},
+            age : {type : "integer"}
+        }
+    }
+}