org.frameworkset.web.servlet.support.ServletContextResource Maven / Gradle / Ivy
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/*
* Copyright 2008 biaoping.yin
*
* 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.frameworkset.web.servlet.support;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import javax.servlet.ServletContext;
import org.frameworkset.util.Assert;
import org.frameworkset.util.io.AbstractResource;
import org.frameworkset.util.io.ContextResource;
import org.frameworkset.util.io.Resource;
import org.frameworkset.web.util.WebUtils;
import com.frameworkset.util.StringUtil;
/**
* Title: ServletContextResource.java
* Description:
* bboss workgroup
* Copyright (c) 2007
* @Date 2010-9-24 下午10:08:35
* @author biaoping.yin
* @version 1.0
*/
public class ServletContextResource extends AbstractResource implements ContextResource {
private final ServletContext servletContext;
private final String path;
/**
* Create a new ServletContextResource.
* The Servlet spec requires that resource paths start with a slash,
* even if many containers accept paths without leading slash too.
* Consequently, the given path will be prepended with a slash if it
* doesn't already start with one.
* @param servletContext the ServletContext to load from
* @param path the path of the resource
*/
public ServletContextResource(ServletContext servletContext, String path) {
// check ServletContext
Assert.notNull(servletContext, "Cannot resolve ServletContextResource without ServletContext");
this.servletContext = servletContext;
// check path
Assert.notNull(path, "Path is required");
String pathToUse = StringUtil.cleanPath(path);
if (!pathToUse.startsWith("/")) {
pathToUse = "/" + pathToUse;
}
this.path = pathToUse;
}
/**
* Return the ServletContext for this resource.
*/
public final ServletContext getServletContext() {
return this.servletContext;
}
/**
* Return the path for this resource.
*/
public final String getPath() {
return this.path;
}
/**
* This implementation checks ServletContext.getResource.
* @see javax.servlet.ServletContext#getResource(String)
*/
public boolean exists() {
try {
URL url = this.servletContext.getResource(this.path);
return (url != null);
}
catch (MalformedURLException ex) {
return false;
}
}
/**
* This implementation delegates to ServletContext.getResourceAsStream,
* but throws a FileNotFoundException if no resource found.
* @see javax.servlet.ServletContext#getResourceAsStream(String)
*/
public InputStream getInputStream() throws IOException {
InputStream is = this.servletContext.getResourceAsStream(this.path);
if (is == null) {
throw new FileNotFoundException("Could not open " + getDescription());
}
return is;
}
/**
* This implementation delegates to ServletContext.getResource,
* but throws a FileNotFoundException if no resource found.
* @see javax.servlet.ServletContext#getResource(String)
*/
public URL getURL() throws IOException {
URL url = this.servletContext.getResource(this.path);
if (url == null) {
throw new FileNotFoundException(
getDescription() + " cannot be resolved to URL because it does not exist");
}
return url;
}
/**
* This implementation delegates to ServletContext.getRealPath,
* but throws a FileNotFoundException if not found or not resolvable.
* @see javax.servlet.ServletContext#getRealPath(String)
*/
public File getFile() throws IOException {
String realPath = WebUtils.getRealPath(this.servletContext, this.path);
return new File(realPath);
}
/**
* This implementation creates a ServletContextResource, applying the given path
* relative to the path of the underlying file of this resource descriptor.
* @see StringUtil#applyRelativePath(String, String)
*/
public Resource createRelative(String relativePath) {
String pathToUse = StringUtil.applyRelativePath(this.path, relativePath);
return new ServletContextResource(this.servletContext, pathToUse);
}
/**
* This implementation returns the name of the file that this ServletContext
* resource refers to.
* @see StringUtil#getFilename(String)
*/
public String getFilename() {
return StringUtil.getFilename(this.path);
}
/**
* This implementation returns a description that includes the ServletContext
* resource location.
*/
public String getDescription() {
return "ServletContext resource [" + this.path + "]";
}
public String getPathWithinContext() {
return this.path;
}
/**
* This implementation compares the underlying ServletContext resource locations.
*/
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (obj instanceof ServletContextResource) {
ServletContextResource otherRes = (ServletContextResource) obj;
return (this.servletContext.equals(otherRes.servletContext) && this.path.equals(otherRes.path));
}
return false;
}
/**
* This implementation returns the hash code of the underlying
* ServletContext resource location.
*/
public int hashCode() {
return this.path.hashCode();
}
}