/**
* 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;
}
}