package net.sf.saxon.option.sql;
import net.sf.saxon.expr.Expression;
import net.sf.saxon.expr.RoleLocator;
import net.sf.saxon.expr.TypeChecker;
import net.sf.saxon.instruct.Executable;
import net.sf.saxon.om.AttributeCollection;
import net.sf.saxon.om.Navigator;
import net.sf.saxon.style.StyleElement;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.value.SequenceType;
import net.sf.saxon.value.Whitespace;
/**
* An sql:column element in the stylesheet.
*/
public class SQLColumn extends StyleElement {
private String name;
private Expression select;
/**
* Determine whether this node is an instruction.
* @return false - it is not an instruction
*/
public boolean isInstruction() {
return false;
}
/**
* Determine whether this type of element is allowed to contain a template-body
* @return false: no, it may not contain a template-body
*/
public boolean mayContainSequenceConstructor() {
return false;
}
protected boolean mayContainFallback() {
return false;
}
public void prepareAttributes() throws XPathException {
AttributeCollection atts = getAttributeList();
String selectAtt = null;
String nameAtt = null;
for (int a=0; a<atts.getLength(); a++) {
String localName = atts.getLocalName(a);
if (localName.equals("name")) {
nameAtt = Whitespace.trim(atts.getValue(a));
} else if (localName.equals("select")) {
selectAtt = atts.getValue(a);
} else {
checkUnknownAttribute(atts.getNameCode(a));
}
}
if (nameAtt==null) {
reportAbsence("name");
name = "saxon-dummy-column";
} else {
name = SQLConnect.quoteSqlName(nameAtt);
}
if (selectAtt!=null) {
select = makeExpression(selectAtt);
}
}
public void validate() throws XPathException {
select = typeCheck("select", select);
try {
RoleLocator role =
new RoleLocator(RoleLocator.INSTRUCTION, "sql:column/select", 0);
select = TypeChecker.staticTypeCheck(select,
SequenceType.SINGLE_ATOMIC,
false, role, makeExpressionVisitor());
} catch (XPathException err) {
compileError(err);
}
}
public Expression compile(Executable exec) throws XPathException {
return select;
}
public String getColumnName() {
return Navigator.getAttributeValue(this, "", "name");
}
}
//
// 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.
//