package net.sf.saxon.functions;
import net.sf.saxon.expr.Expression;
import net.sf.saxon.expr.ExpressionVisitor;
import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.om.DocumentInfo;
import net.sf.saxon.om.Item;
import net.sf.saxon.om.NodeInfo;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.type.ItemType;
import net.sf.saxon.type.Type;
import net.sf.saxon.value.StringValue;
/**
* Implements the unparsed-entity-uri() function defined in XSLT 1.0
* and the unparsed-entity-public-id() function defined in XSLT 2.0
*/
public class UnparsedEntity extends SystemFunction {
public static int URI = 0;
public static int PUBLIC_ID = 1;
/**
* Simplify: add a second implicit argument, the context document
* @param visitor an expression visitor
*/
public Expression simplify(ExpressionVisitor visitor) throws XPathException {
UnparsedEntity f = (UnparsedEntity)super.simplify(visitor);
f.addContextDocumentArgument(1, (operation==URI ? "unparsed-entity-uri_9999_": "unparsed-entity-public-id_9999_"));
return f;
}
/**
* Type-check the expression. This also calls preEvaluate() to evaluate the function
* if all the arguments are constant; functions that do not require this behavior
* can override the preEvaluate method.
*/
public Expression typeCheck(ExpressionVisitor visitor, ItemType contextItemType) throws XPathException {
try {
return super.typeCheck(visitor, contextItemType);
} catch (XPathException err) {
if ("XPDY0002".equals(err.getErrorCodeLocalPart())) {
if (operation == URI) {
XPathException e = new XPathException("Cannot call the unparsed-entity-uri()" +
" function when there is no context node");
e.setErrorCode("XTDE1370");
throw e;
} else {
XPathException e = new XPathException("Cannot call the unparsed-entity-public-id()" +
" function when there is no context node");
e.setErrorCode("XTDE1380");
throw e;
}
}
throw err;
}
}
/**
* preEvaluate: this method suppresses compile-time evaluation by doing nothing
* @param visitor an expression visitor
*/
public Expression preEvaluate(ExpressionVisitor visitor) {
return this;
}
/**
* Evaluate the expression
*/
public Item evaluateItem(XPathContext context) throws XPathException {
String arg0 = argument[0].evaluateItem(context).getStringValue();
NodeInfo doc = null;
try {
doc = (NodeInfo)argument[1].evaluateItem(context);
} catch (XPathException err) {
String code = err.getErrorCodeLocalPart();
if ("XPDY0002".equals(code)) {
if (operation == URI) {
XPathException e = new XPathException("Cannot call the unparsed-entity-uri()" +
" function when there is no context node");
e.setErrorCode("XTDE1370");
throw e;
} else {
XPathException e = new XPathException("Cannot call the unparsed-entity-public-id()" +
" function when there is no context node");
e.setErrorCode("XTDE1380");
throw e;
}
} else if ("XPDY0050".equals(code)) {
if (operation == URI) {
XPathException e = new XPathException("Can only call the unparsed-entity-uri()" +
" function when the context node is in a tree rooted at a document node");
e.setErrorCode("XTDE1370");
throw e;
} else {
XPathException e = new XPathException("Can only call the unparsed-entity-public-id()" +
" function when the context node is in a tree rooted at a document node");
e.setErrorCode("XTDE1380");
throw e;
}
}
}
if (doc.getNodeKind() != Type.DOCUMENT) {
String code = (operation==URI ? "XTDE1370" : "XTDE1380");
dynamicError("In function " + getDisplayName() +
", the context node must be in a tree whose root is a document node", code, context);
}
String[] ids = ((DocumentInfo)doc).getUnparsedEntity(arg0);
if (ids==null) return StringValue.EMPTY_STRING;
return new StringValue(ids[operation]);
}
}
//
// 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.
//