import sun.net.www.ParseUtil; //導入方法依賴的package包/類

private CodeSource canonicalizeCodebase(CodeSource cs,

boolean extractSignerCerts) {

String path = null;

CodeSource canonCs = cs;

URL u = cs.getLocation();

if (u != null) {

if (u.getProtocol().equals("jar")) {

// unwrap url embedded inside jar url

String spec = u.getFile();

int separator = spec.indexOf("!/");

if (separator != -1) {

try {

u = new URL(spec.substring(0, separator));

} catch (MalformedURLException e) {

// Fail silently. In this case, url stays what

// it was above

}

}

}

if (u.getProtocol().equals("file")) {

boolean isLocalFile = false;

String host = u.getHost();

isLocalFile = (host == null || host.equals("") ||

host.equals("~") || host.equalsIgnoreCase("localhost"));

if (isLocalFile) {

path = u.getFile().replace('/', File.separatorChar);

path = ParseUtil.decode(path);

}

}

}

if (path != null) {

try {

URL csUrl = null;

path = canonPath(path);

csUrl = ParseUtil.fileToEncodedURL(new File(path));

if (extractSignerCerts) {

canonCs = new CodeSource(csUrl,

getSignerCertificates(cs));

} else {

canonCs = new CodeSource(csUrl,

cs.getCertificates());

}

} catch (IOException ioe) {

// leave codesource as it is, unless we have to extract its

// signer certificates

if (extractSignerCerts) {

canonCs = new CodeSource(cs.getLocation(),

getSignerCertificates(cs));

}

}

} else {

if (extractSignerCerts) {

canonCs = new CodeSource(cs.getLocation(),

getSignerCertificates(cs));

}

}

return canonCs;

}

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