gradle-master/subprojects/base-services/src/main/java/org/gradle/internal/service/TypeStringFormatter.java
/*
 * Copyright 2020 the original author or authors.
 *
 * Licensed 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.gradle.internal.service;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

class TypeStringFormatter {

    static String format(Type type) {
        if (type instanceof Class) {
            Class<?> aClass = (Class) type;
            Class<?> enclosingClass = aClass.getEnclosingClass();
            if (enclosingClass != null) {
                return format(enclosingClass) + "$" + aClass.getSimpleName();
            } else {
                return aClass.getSimpleName();
            }
        } else if (type instanceof ParameterizedType) {
            ParameterizedType parameterizedType = (ParameterizedType) type;
            StringBuilder builder = new StringBuilder();
            builder.append(format(parameterizedType.getRawType()));
            builder.append("<");
            for (int i = 0; i < parameterizedType.getActualTypeArguments().length; i++) {
                Type typeParam = parameterizedType.getActualTypeArguments()[i];
                if (i > 0) {
                    builder.append(", ");
                }
                builder.append(format(typeParam));
            }
            builder.append(">");
            return builder.toString();
        }

        return type.toString();
    }
}
