spring JdkProxyHint 源码

spring JdkProxyHint 代码

文件路径：/spring-core/src/main/java/org/springframework/aot/hint/JdkProxyHint.java

/*
 * Copyright 2002-2022 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
 *
 *      https://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.springframework.aot.hint;

import java.lang.reflect.Proxy;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
import java.util.Objects;

import org.springframework.lang.Nullable;

/**
 * A hint that describes the need for a JDK interface-based {@link Proxy}.
 *
 * @author Stephane Nicoll
 * @author Brian Clozel
 * @since 6.0
 */
public final class JdkProxyHint implements ConditionalHint {

	private final List<TypeReference> proxiedInterfaces;

	@Nullable
	private final TypeReference reachableType;


	private JdkProxyHint(Builder builder) {
		this.proxiedInterfaces = List.copyOf(builder.proxiedInterfaces);
		this.reachableType = builder.reachableType;
	}

	/**
	 * Initialize a builder with the proxied interfaces to use.
	 * @param proxiedInterfaces the interfaces the proxy should implement
	 * @return a builder for the hint
	 */
	public static Builder of(TypeReference... proxiedInterfaces) {
		return new Builder().proxiedInterfaces(proxiedInterfaces);
	}

	/**
	 * Initialize a builder with the proxied interfaces to use.
	 * @param proxiedInterfaces the interfaces the proxy should implement
	 * @return a builder for the hint
	 */
	public static Builder of(Class<?>... proxiedInterfaces) {
		return new Builder().proxiedInterfaces(proxiedInterfaces);
	}

	/**
	 * Return the interfaces to be proxied.
	 * @return the interfaces that the proxy should implement
	 */
	public List<TypeReference> getProxiedInterfaces() {
		return this.proxiedInterfaces;
	}

	@Nullable
	@Override
	public TypeReference getReachableType() {
		return this.reachableType;
	}

	@Override
	public boolean equals(Object o) {
		if (this == o) {
			return true;
		}
		if (o == null || getClass() != o.getClass()) {
			return false;
		}
		JdkProxyHint that = (JdkProxyHint) o;
		return this.proxiedInterfaces.equals(that.proxiedInterfaces)
				&& Objects.equals(this.reachableType, that.reachableType);
	}

	@Override
	public int hashCode() {
		return Objects.hash(this.proxiedInterfaces);
	}


	/**
	 * Builder for {@link JdkProxyHint}.
	 */
	public static class Builder {

		private final LinkedList<TypeReference> proxiedInterfaces;

		@Nullable
		private TypeReference reachableType;


		Builder() {
			this.proxiedInterfaces = new LinkedList<>();
		}

		/**
		 * Add the specified interfaces that the proxy should implement.
		 * @param proxiedInterfaces the interfaces the proxy should implement
		 * @return {@code this}, to facilitate method chaining
		 */
		public Builder proxiedInterfaces(TypeReference... proxiedInterfaces) {
			this.proxiedInterfaces.addAll(Arrays.asList(proxiedInterfaces));
			return this;
		}

		/**
		 * Add the specified interfaces that the proxy should implement.
		 * @param proxiedInterfaces the interfaces the proxy should implement
		 * @return {@code this}, to facilitate method chaining
		 */
		public Builder proxiedInterfaces(Class<?>... proxiedInterfaces) {
			this.proxiedInterfaces.addAll(toTypeReferences(proxiedInterfaces));
			return this;
		}

		/**
		 * Make this hint conditional on the fact that the specified type
		 * can be resolved.
		 * @param reachableType the type that should be reachable for this
		 * hint to apply
		 * @return {@code this}, to facilitate method chaining
		 */
		public Builder onReachableType(TypeReference reachableType) {
			this.reachableType = reachableType;
			return this;
		}

		/**
		 * Create a {@link JdkProxyHint} based on the state of this builder.
		 * @return a JDK proxy hint
		 */
		JdkProxyHint build() {
			return new JdkProxyHint(this);
		}

		private static List<TypeReference> toTypeReferences(Class<?>... proxiedInterfaces) {
			List<String> invalidTypes = Arrays.stream(proxiedInterfaces)
					.filter(candidate -> !candidate.isInterface() || candidate.isSealed())
					.map(Class::getName)
					.toList();
			if (!invalidTypes.isEmpty()) {
				throw new IllegalArgumentException("The following must be non-sealed interfaces: " + invalidTypes);
			}
			return Arrays.stream(proxiedInterfaces).map(TypeReference::of).toList();
		}

	}

}

相关信息

spring 源码目录

相关文章

spring AbstractTypeReference 源码

spring ClassProxyHint 源码

spring ConditionalHint 源码

spring ExecutableHint 源码

spring ExecutableMode 源码

spring FieldHint 源码

spring JavaSerializationHint 源码

spring MemberCategory 源码

spring MemberHint 源码

spring ProxyHints 源码