dubbo CollectionTypeDefinitionBuilder 源码
dubbo CollectionTypeDefinitionBuilder 代码
文件路径：/dubbo-metadata/dubbo-metadata-processor/src/main/java/org/apache/dubbo/metadata/annotation/processing/builder/CollectionTypeDefinitionBuilder.java
/*
* 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.annotation.processing.builder;
import org.apache.dubbo.metadata.definition.model.TypeDefinition;
import javax.annotation.processing.ProcessingEnvironment;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.DeclaredType;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.util.Elements;
import javax.lang.model.util.Types;
import java.util.Collection;
import java.util.Map;
import java.util.Objects;
/**
* {@link TypeBuilder} for Java {@link Collection}
*
* @since 2.7.6
*/
public class CollectionTypeDefinitionBuilder implements DeclaredTypeDefinitionBuilder {
@Override
public boolean accept(ProcessingEnvironment processingEnv, DeclaredType type) {
Elements elements = processingEnv.getElementUtils();
TypeElement collectionTypeElement = elements.getTypeElement(Collection.class.getTypeName());
TypeMirror collectionType = collectionTypeElement.asType();
Types types = processingEnv.getTypeUtils();
TypeMirror erasedType = types.erasure(type);
return types.isAssignable(erasedType, collectionType);
}
@Override
public TypeDefinition build(ProcessingEnvironment processingEnv, DeclaredType type, Map<String, TypeDefinition> typeCache) {
String typeName = type.toString();
TypeDefinition typeDefinition = new TypeDefinition(typeName);
// Generic Type arguments
type.getTypeArguments()
.stream()
.map(typeArgument -> TypeDefinitionBuilder.build(processingEnv, typeArgument, typeCache)) // build the TypeDefinition from typeArgument
.filter(Objects::nonNull)
.map(TypeDefinition::getType)
.forEach(typeDefinition.getItems()::add); // Add into the declared TypeDefinition
return typeDefinition;
}
@Override
public int getPriority() {
return MIN_PRIORITY - 5;
}
}
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