spring ResourceRegion 源码
spring ResourceRegion 代码
文件路径：/spring-core/src/main/java/org/springframework/core/io/support/ResourceRegion.java
/*
* Copyright 2002-2018 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.support;
import org.springframework.core.io.Resource;
import org.springframework.util.Assert;
/**
* Region of a {@link Resource} implementation, materialized by a {@code position}
* within the {@link Resource} and a byte {@code count} for the length of that region.
*
* @author Arjen Poutsma
* @since 4.3
*/
public class ResourceRegion {
private final Resource resource;
private final long position;
private final long count;
/**
* Create a new {@code ResourceRegion} from a given {@link Resource}.
* This region of a resource is represented by a start {@code position}
* and a byte {@code count} within the given {@code Resource}.
* @param resource a Resource
* @param position the start position of the region in that resource
* @param count the byte count of the region in that resource
*/
public ResourceRegion(Resource resource, long position, long count) {
Assert.notNull(resource, "Resource must not be null");
Assert.isTrue(position >= 0, "'position' must be larger than or equal to 0");
Assert.isTrue(count >= 0, "'count' must be larger than or equal to 0");
this.resource = resource;
this.position = position;
this.count = count;
}
/**
* Return the underlying {@link Resource} for this {@code ResourceRegion}.
*/
public Resource getResource() {
return this.resource;
}
/**
* Return the start position of this region in the underlying {@link Resource}.
*/
public long getPosition() {
return this.position;
}
/**
* Return the byte count of this region in the underlying {@link Resource}.
*/
public long getCount() {
return this.count;
}
}
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