package net.sf.saxon.style;
import net.sf.saxon.expr.Expression;
import net.sf.saxon.expr.Literal;
import net.sf.saxon.instruct.Executable;
import net.sf.saxon.om.*;
import net.sf.saxon.sort.SortExpression;
import net.sf.saxon.sort.SortKeyDefinition;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.type.ItemType;
import net.sf.saxon.type.Type;
import net.sf.saxon.type.TypeHierarchy;
import net.sf.saxon.value.Whitespace;
/**
* Handler for xsl:perform-sort elements in stylesheet (XSLT 2.0). <br>
*/
public class XSLPerformSort extends StyleElement {
Expression select = null;
/**
* Determine whether this node is an instruction.
* @return true - it is an instruction
*/
public boolean isInstruction() {
return true;
}
/**
* Determine the type of item returned by this instruction (only relevant if
* it is an instruction).
* @return the item type returned
*/
protected ItemType getReturnedItemType() {
if (select==null) {
return getCommonChildItemType();
} else {
final TypeHierarchy th = getConfiguration().getTypeHierarchy();
return select.getItemType(th);
}
}
/**
* Determine whether this type of element is allowed to contain a template-body
* @return true: yes, it may contain a template-body
*/
public boolean mayContainSequenceConstructor() {
return true;
}
/**
* Specify that xsl:sort is a permitted child
*/
protected boolean isPermittedChild(StyleElement child) {
return (child instanceof XSLSort);
}
public void prepareAttributes() throws XPathException {
AttributeCollection atts = getAttributeList();
String selectAtt = null;
for (int a=0; a<atts.getLength(); a++) {
int nc = atts.getNameCode(a);
String f = getNamePool().getClarkName(nc);
if (f.equals(StandardNames.SELECT)) {
selectAtt = atts.getValue(a);
} else {
checkUnknownAttribute(nc);
}
}
if (selectAtt!=null) {
select = makeExpression(selectAtt);
}
}
public void validate() throws XPathException {
checkSortComesFirst(true);
if (select != null) {
// if there is a select attribute, check that there are no children other than xsl:sort and xsl:fallback
AxisIterator kids = iterateAxis(Axis.CHILD);
while (true) {
NodeInfo child = (NodeInfo)kids.next();
if (child == null) {
break;
}
if (child instanceof XSLSort || child instanceof XSLFallback) {
// no action
} else if (child.getNodeKind() == Type.TEXT && !Whitespace.isWhite(child.getStringValueCS())) {
// with xml:space=preserve, white space nodes may still be there
compileError("Within xsl:perform-sort, significant text must not appear if there is a select attribute",
"XTSE1040");
} else {
((StyleElement)child).compileError(
"Within xsl:perform-sort, child instructions are not allowed if there is a select attribute",
"XTSE1040");
}
}
}
select = typeCheck("select", select);
}
public Expression compile(Executable exec) throws XPathException {
SortKeyDefinition[] sortKeys = makeSortKeys();
if (select != null) {
return new SortExpression(select, sortKeys);
} else {
Expression body = compileSequenceConstructor(exec, iterateAxis(Axis.CHILD), true);
if (body == null) {
body = Literal.makeEmptySequence();
}
try {
return new SortExpression(makeExpressionVisitor().simplify(body), sortKeys);
} catch (XPathException e) {
compileError(e);
return null;
}
}
}
}
//
// 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.
//