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package com.jclark.xml.parse;
import java.net.URL;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* A default implementation of <code>EntityManager</code>.
* @see EntityManager
* @version $Revision: 1.4 $ $Date: 1998/02/17 04:20:35 $
*/
public class EntityManagerImpl implements EntityManager {
public OpenEntity open(String systemId, URL baseURL, String publicId)
throws IOException {
URL useURL = new URL(baseURL, systemId);
return new OpenEntity(useURL.openStream(),
useURL.toString(),
useURL,
null);
}
/**
* Creates an OpenEntity from a file name.
*/
static public OpenEntity openFile(String name) throws IOException {
File file = new File(name);
return new OpenEntity(new FileInputStream(file),
name,
fileToURL(file),
null);
}
/**
* Creates an OpenEntity for the standard input.
*/
static public OpenEntity openStandardInput() throws IOException {
return new OpenEntity(new FileInputStream(FileDescriptor.in),
"<standard input>",
userDirURL(),
null);
}
/**
* Generates a <code>URL</code> from a <code>File</code>.
*/
static public URL fileToURL(File file) {
String path = file.getAbsolutePath();
String fSep = System.getProperty("file.separator");
if (fSep != null && fSep.length() == 1)
path = path.replace(fSep.charAt(0), '/');
if (path.length() > 0 && path.charAt(0) != '/')
path = '/' + path;
try {
return new URL("file", null, path);
}
catch (java.net.MalformedURLException e) {
/* According to the spec this could only happen if the file
protocol were not recognized. */
throw new Error("unexpected MalformedURLException");
}
}
/**
* Generates a URL for the current working directory.
*/
static public URL userDirURL() {
return fileToURL(new File(System.getProperty("user.dir")
+ System.getProperty("file.separator")));
}
}
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