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MapTypeBuilder.java
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MapTypeBuilder.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.apache.dubbo.metadata.definition.builder;
import org.apache.dubbo.metadata.definition.TypeDefinitionBuilder;
import org.apache.dubbo.metadata.definition.model.TypeDefinition;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.text.MessageFormat;
import java.util.Arrays;
import java.util.Map;
import static org.apache.dubbo.common.utils.TypeUtils.getRawClass;
import static org.apache.dubbo.common.utils.TypeUtils.isClass;
import static org.apache.dubbo.common.utils.TypeUtils.isParameterizedType;
/**
* 2015/1/27.
*/
public class MapTypeBuilder implements TypeBuilder {
@Override
public boolean accept(Type type, Class<?> clazz) {
if (clazz == null) {
return false;
}
return Map.class.isAssignableFrom(clazz);
}
@Override
public TypeDefinition build(Type type, Class<?> clazz, Map<Class<?>, TypeDefinition> typeCache) {
if (!(type instanceof ParameterizedType)) {
return new TypeDefinition(clazz.getName());
}
ParameterizedType parameterizedType = (ParameterizedType) type;
Type[] actualTypeArgs = parameterizedType.getActualTypeArguments();
int actualTypeArgsLength = actualTypeArgs == null ? 0 : actualTypeArgs.length;
if (actualTypeArgsLength != 2) {
throw new IllegalArgumentException(MessageFormat.format(
"[ServiceDefinitionBuilder] Map type [{0}] with unexpected amount of arguments [{1}]."
+ Arrays.toString(actualTypeArgs), type, actualTypeArgs));
}
String mapType = type.toString();
TypeDefinition typeDefinition = new TypeDefinition(mapType);
for (int i = 0; i < actualTypeArgsLength; i++) {
Type actualType = actualTypeArgs[i];
TypeDefinition item = null;
Class<?> rawType = getRawClass(actualType);
if (isParameterizedType(actualType)) {
// Nested collection or map.
item = TypeDefinitionBuilder.build(actualType, rawType, typeCache);
} else if (isClass(actualType)) {
item = TypeDefinitionBuilder.build(null, rawType, typeCache);
}
typeDefinition.getItems().add(item);
}
return typeDefinition;
}
}