guava multimap support. issue #992

src/main/java/com/alibaba/fastjson/serializer/GuavaCodec.java

@@ -0,0 +1,23 @@
+package com.alibaba.fastjson.serializer;
+
+import com.google.common.collect.Multimap;
+
+import java.io.IOException;
+import java.lang.reflect.Type;
+import java.util.Collection;
+import java.util.Map;
+
+/**
+ * Created by wenshao on 15/01/2017.
+ */
+public class GuavaCodec implements ObjectSerializer {
+    public static GuavaCodec instance = new GuavaCodec();
+
+    public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType, int features) throws IOException {
+        SerializeWriter out = serializer.out;
+        if (object instanceof Multimap) {
+            Multimap multimap = (Multimap) object;
+            serializer.write(multimap.asMap());
+        }
+    }
+}

src/main/java/com/alibaba/fastjson/serializer/SerializeConfig.java

@@ -83,6 +83,8 @@ public class SerializeConfig {
     private static boolean                                jdk8Error       = false;
     private static boolean                                oracleJdbcError = false;
     private static boolean                                springfoxError  = false;
+    private static boolean                                guavaError      = false;
+
     private boolean                                       asm             = !ASMUtils.IS_ANDROID;
     private ASMSerializerFactory                          asmFactory;
     protected String                                      typeKey         = JSON.DEFAULT_TYPE_KEY;
@@ -531,6 +533,28 @@ private ObjectSerializer getObjectWriter(Class<?> clazz, boolean create) {
                     }
                 }
 
+                if ((!guavaError) //
+                        && className.startsWith("com.google.common.collect.")) {
+                    try {
+                        put(Class.forName("com.google.common.collect.HashMultimap"), //
+                                GuavaCodec.instance);
+                        put(Class.forName("com.google.common.collect.LinkedListMultimap"), //
+                                GuavaCodec.instance);
+                        put(Class.forName("com.google.common.collect.ArrayListMultimap"), //
+                                GuavaCodec.instance);
+                        put(Class.forName("com.google.common.collect.TreeMultimap"), //
+                                GuavaCodec.instance);
+
+                        writer = serializers.get(clazz);
+                        if (writer != null) {
+                            return writer;
+                        }
+                    } catch (ClassNotFoundException e) {
+                        // skip
+                        guavaError = true;
+                    }
+                }
+
                 if (TypeUtils.isProxy(clazz)) {
                     Class<?> superClazz = clazz.getSuperclass();
 

src/test/java/com/alibaba/json/bvt/guava/ArrayListMultimapTest.java

@@ -0,0 +1,29 @@
+package com.alibaba.json.bvt.guava;
+
+import com.alibaba.fastjson.JSON;
+import com.google.common.collect.ArrayListMultimap;
+import com.google.common.collect.HashMultimap;
+import com.google.common.collect.Multimaps;
+import com.google.common.collect.TreeMultimap;
+import com.google.common.primitives.Ints;
+import junit.framework.TestCase;
+
+/**
+ * Created by wenshao on 15/01/2017.
+ */
+public class ArrayListMultimapTest extends TestCase {
+    public void test_for_multimap() throws Exception {
+        ArrayListMultimap<String, Integer> multimap = ArrayListMultimap.create();
+        multimap.putAll("b", Ints.asList(2, 4, 6));
+        multimap.putAll("a", Ints.asList(4, 2, 1));
+        multimap.putAll("c", Ints.asList(2, 5, 3));
+
+
+        String json = JSON.toJSONString(multimap);
+        assertEquals("{\"a\":[4,2,1],\"b\":[2,4,6],\"c\":[2,5,3]}", json);
+
+        TreeMultimap treeMultimap = TreeMultimap.create(multimap);
+        String json2 = JSON.toJSONString(treeMultimap);
+        assertEquals("{\"a\":[1,2,4],\"b\":[2,4,6],\"c\":[2,3,5]}", json2);
+    }
+}

src/test/java/com/alibaba/json/bvt/guava/HashMultimapTest.java

@@ -0,0 +1,21 @@
+package com.alibaba.json.bvt.guava;
+
+import com.alibaba.fastjson.JSON;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.google.common.collect.HashMultimap;
+import com.google.gson.Gson;
+import junit.framework.TestCase;
+
+/**
+ * Created by wenshao on 15/01/2017.
+ */
+public class HashMultimapTest extends TestCase {
+    public void test_for_multimap() throws Exception {
+        HashMultimap map = HashMultimap.create();
+        map.put("name", "a");
+        map.put("name", "b");
+
+        String json = JSON.toJSONString(map);
+        assertEquals("{\"name\":[\"a\",\"b\"]}", json);
+    }
+}

src/test/java/com/alibaba/json/bvt/guava/ImmutableMapTest.java

@@ -0,0 +1,18 @@
+package com.alibaba.json.bvt.guava;
+
+import com.alibaba.fastjson.JSON;
+import com.google.common.collect.ImmutableMap;
+import junit.framework.TestCase;
+
+import java.util.Map;
+
+/**
+ * Created by wenshao on 15/01/2017.
+ */
+public class ImmutableMapTest extends TestCase {
+    public void test_immutableMap() throws Exception {
+        Map<String, Integer> map = ImmutableMap.of("a", 1, "b", 2, "c", 3);
+        String json = JSON.toJSONString(map);
+        assertEquals("{\"a\":1,\"b\":2,\"c\":3}", json);
+    }
+}

src/test/java/com/alibaba/json/bvt/guava/LinkedListMultimapTest.java

@@ -0,0 +1,20 @@
+package com.alibaba.json.bvt.guava;
+
+import com.alibaba.fastjson.JSON;
+import com.google.common.collect.HashMultimap;
+import com.google.common.collect.LinkedListMultimap;
+import junit.framework.TestCase;
+
+/**
+ * Created by wenshao on 15/01/2017.
+ */
+public class LinkedListMultimapTest extends TestCase {
+    public void test_for_multimap() throws Exception {
+        LinkedListMultimap map = LinkedListMultimap.create();
+        map.put("name", "a");
+        map.put("name", "b");
+
+        String json = JSON.toJSONString(map);
+        assertEquals("{\"name\":[\"a\",\"b\"]}", json);
+    }
+}

src/test/java/com/alibaba/json/bvt/guava/MultiMapTes.java

@@ -0,0 +1,21 @@
+package com.alibaba.json.bvt.guava;
+
+import com.alibaba.fastjson.JSON;
+import com.google.common.collect.*;
+import junit.framework.TestCase;
+
+import java.util.Map;
+
+/**
+ * Created by wenshao on 15/01/2017.
+ */
+public class MultiMapTes extends TestCase {
+
+    public void test_multimap() throws Exception {
+        Map<String, Integer> map = ImmutableMap.of("a", 1, "b", 1, "c", 2);
+        SetMultimap<String, Integer> multimap = Multimaps.forMap(map);
+        Multimap<Integer, String> inverse = Multimaps.invertFrom(multimap, HashMultimap.<Integer, String>create());
+        String json = JSON.toJSONString(inverse);
+        assertEquals("{1:[\"a\",\"b\"],2:[\"c\"]}",json);
+    }
+}

src/test/java/com/alibaba/json/test/FNV32_CollisionTest.java

@@ -87,4 +87,12 @@ static long fnv_hash(char[] chars) {
         }
         return hash;
     }
+
+    static long hash(char[] chars) {
+        long hash = 0;
+        for (int i = 0; i < chars.length; ++i) {
+            hash = 31 * hash + chars[i];
+        }
+        return hash;
+    }
 }