/** * Copyright 2013-2014 Recruit Technologies Co., Ltd. and contributors * (see CONTRIBUTORS.md) * * Licensed under the Apache License, Version 2.0 (the "License"); you may * not use this file except in compliance with the License. A copy of the * License is distributed with this work in the LICENSE.md file. You may * also obtain a copy of the License from * * 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.gennai.gungnir.utils; import java.lang.reflect.Array; import java.util.List; import java.util.Map; import scala.collection.JavaConverters; import scala.collection.convert.Wrappers.MapWrapper; import com.google.common.collect.Lists; import com.google.common.collect.Maps; public final class ScalaConverters { private ScalaConverters() { } public static Class<?>[] getScalaTypes() { return new Class<?>[] {scala.collection.Seq.class, scala.collection.immutable.Map.class}; } public static boolean isScalaType(Class<?> type) { return type.isArray() ? type.getComponentType() == scala.collection.Seq.class || type.getComponentType() == scala.collection.immutable.Map.class : type == scala.collection.Seq.class || type == scala.collection.immutable.Map.class; } public static Class<?> asJavaType(Class<?> type) { if (type.isArray()) { if (type.getComponentType() == scala.collection.Seq.class) { return Array.newInstance(List.class, 0).getClass(); } else if (type.getComponentType() == scala.collection.immutable.Map.class) { return Array.newInstance(Map.class, 0).getClass(); } } else { if (type == scala.collection.Seq.class) { return List.class; } else if (type == scala.collection.immutable.Map.class) { return Map.class; } } return type; } public static Object asScala(Object value) { if (value instanceof List) { return JavaConverters.asScalaBufferConverter((List<?>) value).asScala().toSeq(); } else if (value instanceof Map) { @SuppressWarnings("unchecked") Map<Object, Object> map = (Map<Object, Object>) value; return JavaConverters.mapAsScalaMapConverter(map).asScala() .toMap(scala.Predef.<scala.Tuple2<Object, Object>>conforms()); } return value; } public static Object asJava(Object value) { if (value instanceof scala.collection.Seq) { return Lists.newArrayList(JavaConverters .asJavaCollectionConverter((scala.collection.Seq<?>) value).asJavaCollection()); } else if (value instanceof scala.collection.immutable.Map) { @SuppressWarnings("unchecked") scala.collection.immutable.Map<Object, Object> map = (scala.collection.immutable.Map<Object, Object>) value; return Maps.newHashMap((MapWrapper<Object, Object>) JavaConverters.mapAsJavaMapConverter(map) .asJava()); } return value; } }