org.apache.dubbo.metadata.definition.MethodDefinitionBuilder Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of dubbo Show documentation

The all in one project of dubbo

There is a newer version: 3.3.2

/*
 * 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;

import org.apache.dubbo.metadata.definition.model.MethodDefinition;
import org.apache.dubbo.metadata.definition.model.TypeDefinition;

import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;

/**
 * {@link MethodDefinition} Builder based on Java Reflection
 *
 * @since 2.7.6
 */
public class MethodDefinitionBuilder {

    private final TypeDefinitionBuilder builder;

    public MethodDefinitionBuilder(TypeDefinitionBuilder builder) {
        this.builder = builder;
    }

    public MethodDefinitionBuilder() {
        this.builder = new TypeDefinitionBuilder();
    }

    /**
     * Build the instance of {@link MethodDefinition}
     *
     * @param method {@link Method}
     * @return non-null
     */
    public MethodDefinition build(Method method) {

        MethodDefinition md = new MethodDefinition();
        md.setName(method.getName());

        // Process the parameters
        Class[] paramTypes = method.getParameterTypes();
        Type[] genericParamTypes = method.getGenericParameterTypes();

        int paramSize = paramTypes.length;
        String[] parameterTypes = new String[paramSize];
        List parameters = new ArrayList<>(paramSize);
        for (int i = 0; i < paramSize; i++) {
            TypeDefinition parameter = builder.build(genericParamTypes[i], paramTypes[i]);
            parameterTypes[i] = parameter.getType();
            parameters.add(parameter);
        }

        md.setParameterTypes(parameterTypes);
        md.setParameters(parameters);

        // Process return type.
        TypeDefinition td = builder.build(method.getGenericReturnType(), method.getReturnType());
        md.setReturnType(td.getType());

        return md;
    }
}