package com.xmlcalabash.functions;
import com.xmlcalabash.core.XProcException;
import com.xmlcalabash.runtime.XCompoundStep;
import com.xmlcalabash.runtime.XStep;
import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.lib.ExtensionFunctionCall;
import net.sf.saxon.lib.ExtensionFunctionDefinition;
import net.sf.saxon.om.NodeInfo;
import net.sf.saxon.om.Sequence;
import net.sf.saxon.om.SequenceIterator;
import net.sf.saxon.om.StructuredQName;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.tree.iter.SingletonIterator;
import net.sf.saxon.value.AnyURIValue;
import net.sf.saxon.value.SequenceType;
import com.xmlcalabash.core.XProcConstants;
import com.xmlcalabash.core.XProcRuntime;
//
// 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 Norman Walsh are Copyright (C) Mark Logic Corporation. All Rights Reserved.
//
// Contributor(s): Norman Walsh.
//
/**
* Implementation of the XSLT system-property() function
*/
public class BaseURI extends XProcExtensionFunctionDefinition {
private static StructuredQName funcname = new StructuredQName("p", XProcConstants.NS_XPROC,"base-uri");
protected BaseURI() {
// you can't call this one
}
public BaseURI(XProcRuntime runtime) {
registry.registerRuntime(this, runtime);
}
public StructuredQName getFunctionQName() {
return funcname;
}
public int getMinimumNumberOfArguments() {
return 0;
}
public int getMaximumNumberOfArguments() {
return 1;
}
public SequenceType[] getArgumentTypes() {
return new SequenceType[]{SequenceType.OPTIONAL_NODE};
}
public SequenceType getResultType(SequenceType[] suppliedArgumentTypes) {
return SequenceType.SINGLE_ATOMIC;
}
public boolean dependsOnFocus() {
return true;
}
public ExtensionFunctionCall makeCallExpression() {
return new BaseURICall(this);
}
private class BaseURICall extends ExtensionFunctionCall {
private XProcExtensionFunctionDefinition xdef = null;
public BaseURICall(XProcExtensionFunctionDefinition def) {
xdef = def;
}
public Sequence call(XPathContext xPathContext, Sequence[] sequences) throws XPathException {
String baseURI = null;
XProcRuntime runtime = registry.getRuntime(xdef);
XStep step = runtime.getXProcData().getStep();
// FIXME: this can't be the best way to do this...
// step == null in use-when
if (step != null && !(step instanceof XCompoundStep)) {
throw XProcException.dynamicError(23);
}
if (sequences.length > 0) {
NodeInfo item = (NodeInfo) sequences[0].head();
baseURI = item.getBaseURI();
} else {
NodeInfo item = (NodeInfo) xPathContext.getContextItem();
baseURI = item.getBaseURI();
}
if (baseURI == null) {
return new AnyURIValue("");
}
return new AnyURIValue(baseURI);
}
}
}