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.trans.XPathException;
import net.sf.saxon.type.ItemType;
import net.sf.saxon.type.TypeHierarchy;
/**
* An xsl:sequence element in the stylesheet. <br>
* The xsl:sequence element takes attributes:<ul>
* <li>a mandatory attribute select="expression".</li>
* </ul>
*/
public final class XSLSequence extends StyleElement {
private Expression select;
/**
* 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() {
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 false;
}
/**
* Determine whether this type of element is allowed to contain an xsl:fallback
* instruction
*/
public boolean mayContainFallback() {
return true;
}
public void prepareAttributes() throws XPathException {
String selectAtt = null;
AttributeCollection atts = getAttributeList();
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);
} else {
reportAbsence(StandardNames.SELECT);
select = Literal.makeEmptySequence();
}
}
public void validate() throws XPathException {
AxisIterator kids = iterateAxis(Axis.CHILD);
while (true) {
NodeInfo child = (NodeInfo)kids.next();
if (child == null) break;
if (!(child instanceof XSLFallback)) {
compileError("The only child node allowed for xsl:sequence is an xsl:fallback instruction", "XTSE0010");
break;
}
}
select = typeCheck("select", select);
}
public Expression compile(Executable exec) {
return select;
}
}
//
// 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.
//