spring DescriptiveResource 源码
spring DescriptiveResource 代码
文件路径：/spring-core/src/main/java/org/springframework/core/io/DescriptiveResource.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;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import org.springframework.lang.Nullable;
/**
* Simple {@link Resource} implementation that holds a resource description
* but does not point to an actually readable resource.
*
* <p>To be used as placeholder if a {@code Resource} argument is
* expected by an API but not necessarily used for actual reading.
*
* @author Juergen Hoeller
* @since 1.2.6
*/
public class DescriptiveResource extends AbstractResource {
private final String description;
/**
* Create a new DescriptiveResource.
* @param description the resource description
*/
public DescriptiveResource(@Nullable String description) {
this.description = (description != null ? description : "");
}
@Override
public boolean exists() {
return false;
}
@Override
public boolean isReadable() {
return false;
}
@Override
public InputStream getInputStream() throws IOException {
throw new FileNotFoundException(
getDescription() + " cannot be opened because it does not point to a readable resource");
}
@Override
public String getDescription() {
return this.description;
}
/**
* This implementation compares the underlying description String.
*/
@Override
public boolean equals(@Nullable Object other) {
return (this == other || (other instanceof DescriptiveResource &&
((DescriptiveResource) other).description.equals(this.description)));
}
/**
* This implementation returns the hash code of the underlying description String.
*/
@Override
public int hashCode() {
return this.description.hashCode();
}
}
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