Remove MapUtil

We no longer support Java 8.

Author: harawata

src/main/java/org/apache/ibatis/binding/MapperProxy.java

@@ -28,7 +28,6 @@
 
 import org.apache.ibatis.reflection.ExceptionUtil;
 import org.apache.ibatis.session.SqlSession;
-import org.apache.ibatis.util.MapUtil;
 
 /**
  * @author Clinton Begin
@@ -91,7 +90,7 @@ public Object invoke(Object proxy, Method method, Object[] args) throws Throwabl
 
   private MapperMethodInvoker cachedInvoker(Method method) throws Throwable {
     try {
-      return MapUtil.computeIfAbsent(methodCache, method, m -> {
+      return methodCache.computeIfAbsent(method, m -> {
         if (!m.isDefault()) {
           return new PlainMethodInvoker(new MapperMethod(mapperInterface, method, sqlSession.getConfiguration()));
         }

src/main/java/org/apache/ibatis/cache/TransactionalCacheManager.java

@@ -19,7 +19,6 @@
 import java.util.Map;
 
 import org.apache.ibatis.cache.decorators.TransactionalCache;
-import org.apache.ibatis.util.MapUtil;
 
 /**
  * @author Clinton Begin
@@ -53,7 +52,7 @@ public void rollback() {
   }
 
   private TransactionalCache getTransactionalCache(Cache cache) {
-    return MapUtil.computeIfAbsent(transactionalCaches, cache, TransactionalCache::new);
+    return transactionalCaches.computeIfAbsent(cache, TransactionalCache::new);
   }
 
 }

src/main/java/org/apache/ibatis/datasource/unpooled/UnpooledDataSource.java

@@ -31,7 +31,6 @@
 import javax.sql.DataSource;
 
 import org.apache.ibatis.io.Resources;
-import org.apache.ibatis.util.MapUtil;
 
 /**
  * @author Clinton Begin
@@ -233,7 +232,7 @@ private Connection doGetConnection(Properties properties) throws SQLException {
 
   private void initializeDriver() throws SQLException {
     try {
-      MapUtil.computeIfAbsent(registeredDrivers, driver, x -> {
+      registeredDrivers.computeIfAbsent(driver, x -> {
         Class<?> driverType;
         try {
           if (driverClassLoader != null) {

src/main/java/org/apache/ibatis/executor/keygen/Jdbc3KeyGenerator.java

@@ -41,7 +41,6 @@
 import org.apache.ibatis.type.JdbcType;
 import org.apache.ibatis.type.TypeHandler;
 import org.apache.ibatis.type.TypeHandlerRegistry;
-import org.apache.ibatis.util.MapUtil;
 
 /**
  * @author Clinton Begin
@@ -156,8 +155,8 @@ private void assignKeysToParamMap(Configuration configuration, ResultSet rs, Res
     for (int i = 0; i < keyProperties.length; i++) {
       Entry<String, KeyAssigner> entry = getAssignerForParamMap(configuration, rsmd, i + 1, paramMap, keyProperties[i],
           keyProperties, true);
-      Entry<Iterator<?>, List<KeyAssigner>> iteratorPair = MapUtil.computeIfAbsent(assignerMap, entry.getKey(),
-          k -> MapUtil.entry(collectionize(paramMap.get(k)).iterator(), new ArrayList<>()));
+      Entry<Iterator<?>, List<KeyAssigner>> iteratorPair = assignerMap.computeIfAbsent(entry.getKey(),
+          k -> Map.entry(collectionize(paramMap.get(k)).iterator(), new ArrayList<>()));
       iteratorPair.getValue().add(entry.getValue());
     }
     long counter = 0;
@@ -193,7 +192,7 @@ private Entry<String, KeyAssigner> getAssignerForParamMap(Configuration config,
     if (keySet.contains(paramName)) {
       String argParamName = omitParamName ? null : paramName;
       String argKeyProperty = keyProperty.substring(firstDot + 1);
-      return MapUtil.entry(paramName, new KeyAssigner(config, rsmd, columnPosition, argParamName, argKeyProperty));
+      return Map.entry(paramName, new KeyAssigner(config, rsmd, columnPosition, argParamName, argKeyProperty));
     }
     if (singleParam) {
       return getAssignerForSingleParam(config, rsmd, columnPosition, paramMap, keyProperty, omitParamName);
@@ -210,7 +209,7 @@ private Entry<String, KeyAssigner> getAssignerForSingleParam(Configuration confi
     // Assume 'keyProperty' to be a property of the single param.
     String singleParamName = nameOfSingleParam(paramMap);
     String argParamName = omitParamName ? null : singleParamName;
-    return MapUtil.entry(singleParamName, new KeyAssigner(config, rsmd, columnPosition, argParamName, keyProperty));
+    return Map.entry(singleParamName, new KeyAssigner(config, rsmd, columnPosition, argParamName, keyProperty));
   }
 
   private static String nameOfSingleParam(Map<String, ?> paramMap) {

src/main/java/org/apache/ibatis/executor/resultset/DefaultResultSetHandler.java

@@ -66,7 +66,6 @@
 import org.apache.ibatis.type.JdbcType;
 import org.apache.ibatis.type.TypeHandler;
 import org.apache.ibatis.type.TypeHandlerRegistry;
-import org.apache.ibatis.util.MapUtil;
 
 /**
  * @author Clinton Begin
@@ -618,7 +617,7 @@ private void addPendingChildRelation(ResultSet rs, MetaObject metaResultObject,
     PendingRelation deferLoad = new PendingRelation();
     deferLoad.metaObject = metaResultObject;
     deferLoad.propertyMapping = parentMapping;
-    List<PendingRelation> relations = MapUtil.computeIfAbsent(pendingRelations, cacheKey, k -> new ArrayList<>());
+    List<PendingRelation> relations = pendingRelations.computeIfAbsent(cacheKey, k -> new ArrayList<>());
     // issue #255
     relations.add(deferLoad);
     ResultMapping previous = nextResultMaps.get(parentMapping.getResultSet());
@@ -820,7 +819,7 @@ private boolean applyArgNameBasedConstructorAutoMapping(ResultSetWrapper rsw, Re
           constructorArgs.add(value);
           final String mapKey = resultMap.getId() + ":" + columnPrefix;
           if (!autoMappingsCache.containsKey(mapKey)) {
-            MapUtil.computeIfAbsent(constructorAutoMappingColumns, mapKey, k -> new ArrayList<>()).add(columnName);
+            constructorAutoMappingColumns.computeIfAbsent(mapKey, k -> new ArrayList<>()).add(columnName);
           }
           columnNotFound = false;
           foundValues = value != null || foundValues;

src/main/java/org/apache/ibatis/plugin/Plugin.java

@@ -24,7 +24,6 @@
 import java.util.Set;
 
 import org.apache.ibatis.reflection.ExceptionUtil;
-import org.apache.ibatis.util.MapUtil;
 
 /**
  * @author Clinton Begin
@@ -74,7 +73,7 @@ private static Map<Class<?>, Set<Method>> getSignatureMap(Interceptor intercepto
     Signature[] sigs = interceptsAnnotation.value();
     Map<Class<?>, Set<Method>> signatureMap = new HashMap<>();
     for (Signature sig : sigs) {
-      Set<Method> methods = MapUtil.computeIfAbsent(signatureMap, sig.type(), k -> new HashSet<>());
+      Set<Method> methods = signatureMap.computeIfAbsent(sig.type(), k -> new HashSet<>());
       try {
         Method method = sig.type().getMethod(sig.method(), sig.args());
         methods.add(method);

src/main/java/org/apache/ibatis/reflection/DefaultReflectorFactory.java

@@ -18,8 +18,6 @@
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
 
-import org.apache.ibatis.util.MapUtil;
-
 public class DefaultReflectorFactory implements ReflectorFactory {
   private boolean classCacheEnabled = true;
   private final ConcurrentMap<Class<?>, Reflector> reflectorMap = new ConcurrentHashMap<>();
@@ -41,7 +39,7 @@ public void setClassCacheEnabled(boolean classCacheEnabled) {
   public Reflector findForClass(Class<?> type) {
     if (classCacheEnabled) {
       // synchronized (type) removed see issue #461
-      return MapUtil.computeIfAbsent(reflectorMap, type, Reflector::new);
+      return reflectorMap.computeIfAbsent(type, Reflector::new);
     }
     return new Reflector(type);
   }

src/main/java/org/apache/ibatis/reflection/Reflector.java

@@ -43,7 +43,6 @@
 import org.apache.ibatis.reflection.invoker.MethodInvoker;
 import org.apache.ibatis.reflection.invoker.SetFieldInvoker;
 import org.apache.ibatis.reflection.property.PropertyNamer;
-import org.apache.ibatis.util.MapUtil;
 
 /**
  * This class represents a cached set of class definition information that allows for easy mapping between property
@@ -155,7 +154,7 @@ private void addSetMethods(Method[] methods) {
 
   private void addMethodConflict(Map<String, List<Method>> conflictingMethods, String name, Method method) {
     if (isValidPropertyName(name)) {
-      List<Method> list = MapUtil.computeIfAbsent(conflictingMethods, name, k -> new ArrayList<>());
+      List<Method> list = conflictingMethods.computeIfAbsent(name, k -> new ArrayList<>());
       list.add(method);
     }
   }

src/main/java/org/apache/ibatis/scripting/LanguageDriverRegistry.java

@@ -18,8 +18,6 @@
 import java.util.HashMap;
 import java.util.Map;
 
-import org.apache.ibatis.util.MapUtil;
-
 /**
  * @author Frank D. Martinez [mnesarco]
  */
@@ -33,7 +31,7 @@ public void register(Class<? extends LanguageDriver> cls) {
     if (cls == null) {
       throw new IllegalArgumentException("null is not a valid Language Driver");
     }
-    MapUtil.computeIfAbsent(languageDriverMap, cls, k -> {
+    languageDriverMap.computeIfAbsent(cls, k -> {
       try {
         return k.getDeclaredConstructor().newInstance();
       } catch (Exception ex) {