package client.net.sf.saxon.ce.style;
import com.google.gwt.logging.client.LogConfiguration;
import client.net.sf.saxon.ce.LogController;
import client.net.sf.saxon.ce.expr.Expression;
import client.net.sf.saxon.ce.expr.Literal;
import client.net.sf.saxon.ce.expr.instruct.Executable;
import client.net.sf.saxon.ce.om.*;
import client.net.sf.saxon.ce.tree.iter.AxisIterator;
import client.net.sf.saxon.ce.trans.XPathException;
import client.net.sf.saxon.ce.type.ItemType;
import client.net.sf.saxon.ce.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;
private String selectAttTrace = "";
/**
* 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();
}
if (LogConfiguration.loggingIsEnabled() && LogController.traceIsEnabled()) {
selectAttTrace = selectAtt;
}
}
public void validate(Declaration decl) 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);
}
public Expression compile(Executable exec, Declaration decl) {
if (LogConfiguration.loggingIsEnabled() && LogController.traceIsEnabled()) {
select.AddTraceProperty("select", selectAttTrace);
}
return select;
}
}
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is “Incompatible With Secondary Licenses”, as defined by the Mozilla Public License, v. 2.0.