package net.sf.saxon.functions;
import net.sf.saxon.Configuration;
import net.sf.saxon.Err;
import net.sf.saxon.Platform;
import net.sf.saxon.expr.ExpressionVisitor;
import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.expr.Expression;
import net.sf.saxon.om.Item;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.value.AnyURIValue;
import net.sf.saxon.value.AtomicValue;
import java.io.File;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
/**
* This class supports the resolve-uri() functions in XPath 2.0
*/
public class ResolveURI extends SystemFunction {
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;
}
/**
* Copy an expression. This makes a deep copy.
* @return the copy of the original expression
*/
public Expression copy() {
ResolveURI d = (ResolveURI)super.copy();
d.expressionBaseURI = expressionBaseURI;
return d;
}
/**
* 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 base;
if (argument.length == 2) {
base = argument[1].evaluateAsString(context).toString();
} else {
base = expressionBaseURI;
if (expressionBaseURI == null) {
dynamicError("Base URI in static context of resolve-uri() is unknown", "FONS0005", context);
return null;
}
}
Platform platform = Configuration.getPlatform();
try {
URI resolved = platform.makeAbsolute(relative, base);
return new AnyURIValue(resolved.toString());
} catch (URISyntaxException err) {
dynamicError("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) {
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 + '/';
}
try {
URL currentDirectoryURL = new File(dir).toURL();
URL baseURL = new URL(currentDirectoryURL, systemId);
// System.err.println("SAX Driver: expanded " + systemId + " to " + baseURL);
return baseURL.toString();
} catch (MalformedURLException err2) {
// go with the original one
return systemId;
}
}
}
/**
* 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)));
}
}
//
// The contents of this file are subject to the Mozilla Public License Version 1.0 (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.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations under the License.
//
// The Original Code is: all this file.
//
// The Initial Developer of the Original Code is Michael H. Kay.
//
// Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
//
// Contributor(s): none.
//