package client.net.sf.saxon.ce.functions;
import client.net.sf.saxon.ce.expr.ExpressionVisitor;
import client.net.sf.saxon.ce.expr.XPathContext;
import client.net.sf.saxon.ce.om.Item;
import client.net.sf.saxon.ce.trans.Err;
import client.net.sf.saxon.ce.trans.XPathException;
import client.net.sf.saxon.ce.tree.util.URI;
import client.net.sf.saxon.ce.value.AnyURIValue;
import client.net.sf.saxon.ce.value.AtomicValue;
/**
* This class supports the resolve-uri() functions in XPath 2.0
*/
public class ResolveURI extends SystemFunction {
public ResolveURI newInstance() {
return new ResolveURI();
}
String expressionBaseURI = null;
public void checkArguments(ExpressionVisitor visitor) throws XPathException {
if (expressionBaseURI == null) {
super.checkArguments(visitor);
expressionBaseURI = visitor.getStaticContext().getBaseURI();
if (expressionBaseURI == null && argument.length == 1) {
XPathException de = new XPathException("Base URI in static context of resolve-uri() is unknown");
de.setErrorCode("FONS0005");
throw de;
}
}
}
/**
* Get the static base URI of the expression
*/
public String getStaticBaseURI() {
return expressionBaseURI;
}
/**
* Evaluate the function at run-time
*/
public Item evaluateItem(XPathContext context) throws XPathException {
AtomicValue arg0 = (AtomicValue)argument[0].evaluateItem(context);
if (arg0 == null) {
return null;
}
String relative = arg0.getStringValue();
String msgBase = "in resolve-uri(), Base URI ";
String base;
if (argument.length == 2) {
base = argument[1].evaluateAsString(context).toString();
} else {
base = expressionBaseURI;
if (expressionBaseURI == null) {
dynamicError(msgBase + "in static context of resolve-uri() is unknown", "FONS0005", context);
return null;
}
}
try {
URI absoluteURI = new URI(base, true);
if (!absoluteURI.isAbsolute()) {
URI relativeURI = new URI(relative, true);
if (relativeURI.isAbsolute()) {
return new AnyURIValue(relative);
}
dynamicError(msgBase + "in resolve-uri(): Base URI " + Err.wrap(base) + " is not an absolute URI", "FORG0002", context);
return null;
}
URI resolved = makeAbsolute(relative, base);
return new AnyURIValue(resolved.toString());
} catch (URI.URISyntaxException err) {
dynamicError(msgBase + "Base URI " + Err.wrap(base) + " is invalid: " + err.getMessage(),
"FORG0002", context);
return null;
}
}
/**
* If a system ID can't be parsed as a URL, try to expand it as a relative
* URI using the current directory as the base URI.
*/
public static String tryToExpand(String systemId) {
return systemId;
// if (systemId==null) {
// systemId = "";
// }
// try {
// new URL(systemId);
// return systemId; // all is well
// } catch (MalformedURLException err) {
// String dir;
// try {
// dir = System.getProperty("user.dir");
// } catch (Exception geterr) {
// // this doesn't work when running an applet
// return systemId;
// }
// if (!(dir.endsWith("/") || systemId.startsWith("/"))) {
// dir = dir + '/';
// }
//
// URI currentDirectoryURI = new File(dir).toURI();
// URI baseURI = currentDirectoryURI.resolve(systemId);
// return baseURI.toString();
//
// }
}
/**
* Construct an absolute URI from a relative URI and a base URI. The method uses the resolve
* method of the java.net.URI class, except where the base URI uses the (non-standard) "jar:" scheme,
* in which case the method used is <code>new URL(baseURL, relativeURL)</code>.
*
* <p>Spaces in either URI are converted to %20</p>
*
* <p>If no base URI is available, and the relative URI is not an absolute URI, then the current
* directory is used as a base URI.</p>
*
* @param relativeURI the relative URI. Null is permitted provided that the base URI is an absolute URI
* @param base the base URI. Null is permitted provided that relativeURI is an absolute URI
* @return the absolutized URI
* @throws java.net.URISyntaxException if either of the strings is not a valid URI or
* if the resolution fails
*/
public static URI makeAbsolute(String relativeURI, String base) throws URI.URISyntaxException {
URI absoluteURI;
// System.err.println("makeAbsolute " + relativeURI + " against base " + base);
if (relativeURI == null) {
absoluteURI = new URI(ResolveURI.escapeSpaces(base), true);
if (!absoluteURI.isAbsolute()) {
throw new URI.URISyntaxException(base + ": Relative URI not supplied, so base URI must be absolute");
} else {
return absoluteURI;
}
}
relativeURI = ResolveURI.escapeSpaces(relativeURI);
base = ResolveURI.escapeSpaces(base);
try {
if (base==null || base.length() == 0) {
absoluteURI = new URI(relativeURI, true);
if (!absoluteURI.isAbsolute()) {
String expandedBase = ResolveURI.tryToExpand(base);
if (!expandedBase.equals(base)) { // prevent infinite recursion
return makeAbsolute(relativeURI, expandedBase);
}
}
} else {
URI baseURI;
try {
baseURI = new URI(base);
} catch (URI.URISyntaxException e) {
throw new URI.URISyntaxException(base + ": Invalid base URI: " + e.getMessage());
}
if (baseURI.getFragment() != null) {
int hash = base.indexOf('#');
if (hash >= 0) {
base = base.substring(0, hash);
}
try {
baseURI = new URI(base);
} catch (URI.URISyntaxException e) {
throw new URI.URISyntaxException(base + ": Invalid base URI: " + e.getMessage());
}
}
try {
new URI(relativeURI, true); // for validation only
} catch (URI.URISyntaxException e) {
throw new URI.URISyntaxException(base + ": Invalid relative URI: " + e.getMessage());
}
absoluteURI = (relativeURI.length() == 0 ? baseURI : baseURI.resolve(relativeURI));
}
} catch (IllegalArgumentException err0) {
// can be thrown by resolve() when given a bad URI
throw new URI.URISyntaxException(relativeURI + ": Cannot resolve URI against base " + Err.wrap(base));
}
return absoluteURI;
}
/**
* Replace spaces by %20
*/
public static String escapeSpaces(String s) {
// It's not entirely clear why we have to escape spaces by hand, and not other special characters;
// it's just that tests with a variety of filenames show that this approach seems to work.
if (s == null) return s;
int i = s.indexOf(' ');
if (i < 0) {
return s;
}
return (i == 0 ? "" : s.substring(0, i))
+ "%20"
+ (i == s.length()-1 ? "" : escapeSpaces(s.substring(i+1)));
}
}
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is “Incompatible With Secondary Licenses”, as defined by the Mozilla Public License, v. 2.0.