spring WritableResource 源码
spring WritableResource 代码
文件路径：/spring-core/src/main/java/org/springframework/core/io/WritableResource.java
/*
* Copyright 2002-2017 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.core.io;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.channels.Channels;
import java.nio.channels.WritableByteChannel;
/**
* Extended interface for a resource that supports writing to it.
* Provides an {@link #getOutputStream() OutputStream accessor}.
*
* @author Juergen Hoeller
* @since 3.1
* @see java.io.OutputStream
*/
public interface WritableResource extends Resource {
/**
* Indicate whether the contents of this resource can be written
* via {@link #getOutputStream()}.
* <p>Will be {@code true} for typical resource descriptors;
* note that actual content writing may still fail when attempted.
* However, a value of {@code false} is a definitive indication
* that the resource content cannot be modified.
* @see #getOutputStream()
* @see #isReadable()
*/
default boolean isWritable() {
return true;
}
/**
* Return an {@link OutputStream} for the underlying resource,
* allowing to (over-)write its content.
* @throws IOException if the stream could not be opened
* @see #getInputStream()
*/
OutputStream getOutputStream() throws IOException;
/**
* Return a {@link WritableByteChannel}.
* <p>It is expected that each call creates a <i>fresh</i> channel.
* <p>The default implementation returns {@link Channels#newChannel(OutputStream)}
* with the result of {@link #getOutputStream()}.
* @return the byte channel for the underlying resource (must not be {@code null})
* @throws java.io.FileNotFoundException if the underlying resource doesn't exist
* @throws IOException if the content channel could not be opened
* @since 5.0
* @see #getOutputStream()
*/
default WritableByteChannel writableChannel() throws IOException {
return Channels.newChannel(getOutputStream());
}
}
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