package net.sf.saxon.value;
import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.functions.Component;
import net.sf.saxon.om.NameChecker;
import net.sf.saxon.om.NamePool;
import net.sf.saxon.om.StructuredQName;
import net.sf.saxon.om.StandardNames;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.type.*;
/**
* A QName value. This implements the so-called "triples proposal", in which the prefix is retained as
* part of the value. The prefix is not used in any operation on a QName other than conversion of the
* QName to a string.
*/
public class QNameValue extends QualifiedNameValue {
/**
* Constructor for a QName that is known to be valid. No validation takes place.
* @param prefix The prefix part of the QName (not used in comparisons). Use "" to represent the
* default prefix.
* @param uri The namespace part of the QName. Use "" to represent the non-namespace.
* @param localName The local part of the QName
*/
public QNameValue(String prefix, String uri, String localName) {
this(prefix, uri, localName, BuiltInAtomicType.QNAME);
}
/**
* Constructor for a QName that is known to be valid, allowing a user-defined subtype of QName
* to be specified. No validation takes place.
* @param prefix The prefix part of the QName (not used in comparisons). Use "" to represent the
* default prefix (but null is also accepted)
* @param uri The namespace part of the QName. Use null to represent the non-namespace (but "" is also
* accepted).
* @param localName The local part of the QName
* @param type The type label, xs:QName or a subtype of xs:QName
*/
public QNameValue(String prefix, String uri, String localName, AtomicType type) {
qName = new StructuredQName(prefix, uri, localName);
if (type == null) {
type = BuiltInAtomicType.QNAME;
}
typeLabel = type;
}
/**
* Constructor starting from a NamePool namecode
* @param namePool The name pool containing the specified name code
* @param nameCode The name code identifying this name in the name pool
*/
public QNameValue(NamePool namePool, int nameCode) {
String prefix = namePool.getPrefix(nameCode);
String uri = namePool.getURI(nameCode);
String localPart = namePool.getLocalName(nameCode);
qName = new StructuredQName(prefix, uri, localPart);
typeLabel = BuiltInAtomicType.QNAME;
}
/**
* Constructor. This constructor validates that the local part is a valid NCName.
* @param prefix The prefix part of the QName (not used in comparisons). Use "" to represent the
* default prefix (but null is also accepted).
* Note that the prefix is not checked for lexical correctness, because in most cases
* it will already have been matched against in-scope namespaces. Where necessary the caller must
* check the prefix.
* @param uri The namespace part of the QName. Use null to represent the non-namespace (but "" is also
* accepted).
* @param localName The local part of the QName
* @param type The atomic type, which must be either xs:QName, or a
* user-defined type derived from xs:QName by restriction
* @param checker NameChecker used to check the name against XML 1.0 or XML 1.1 rules. Supply null
* if the name does not need to be checked (the caller asserts that it is known to be valid)
* @throws XPathException if the local part of the name is malformed or if the name has a null
* namespace with a non-empty prefix
*/
public QNameValue(String prefix, String uri, String localName, AtomicType type, NameChecker checker) throws XPathException {
if (checker != null && !checker.isValidNCName(localName)) {
XPathException err = new XPathException("Malformed local name in QName: '" + localName + '\'');
err.setErrorCode("FORG0001");
throw err;
}
prefix = (prefix==null ? "" : prefix);
uri = ("".equals(uri) ? null : uri);
if (checker != null && uri == null && prefix.length() != 0) {
XPathException err = new XPathException("QName has null namespace but non-empty prefix");
err.setErrorCode("FOCA0002");
throw err;
}
qName = new StructuredQName(prefix, uri, localName);
typeLabel = type;
}
/**
* Constructor
* @param qName the name as a StructuredQName
* @param typeLabel idenfies a subtype of xs:QName
*/
public QNameValue(StructuredQName qName, AtomicType typeLabel) {
this.qName = qName;
this.typeLabel = typeLabel;
}
/**
* Create a copy of this atomic value, with a different type label
*
* @param typeLabel the type label of the new copy. The caller is responsible for checking that
* the value actually conforms to this type.
*/
public AtomicValue copyAsSubType(AtomicType typeLabel) {
return new QNameValue(qName, typeLabel);
}
/**
* Determine the primitive type of the value. This delivers the same answer as
* getItemType().getPrimitiveItemType(). The primitive types are
* the 19 primitive types of XML Schema, plus xs:integer, xs:dayTimeDuration and xs:yearMonthDuration,
* and xs:untypedAtomic. For external objects, the result is AnyAtomicType.
*/
public BuiltInAtomicType getPrimitiveType() {
return BuiltInAtomicType.QNAME;
}
/**
* Convert a QName to target data type
* @param requiredType an integer identifying the required atomic type
* @param context XPath dynamic context
* @return an AtomicValue, a value of the required type; or an ErrorValue
*/
public ConversionResult convertPrimitive(BuiltInAtomicType requiredType, boolean validate, XPathContext context) {
switch (requiredType.getPrimitiveType()) {
case StandardNames.XS_ANY_ATOMIC_TYPE:
case StandardNames.XS_QNAME:
return this;
case StandardNames.XS_STRING:
return new StringValue(getStringValue());
case StandardNames.XS_UNTYPED_ATOMIC:
return new UntypedAtomicValue(getStringValue());
default:
ValidationFailure err = new ValidationFailure("Cannot convert QName to " +
requiredType.getDisplayName());
err.setErrorCode("XPTY0004");
return err;
}
}
/**
* Get a component. Returns a zero-length string if the namespace-uri component is
* requested and is not present.
* @param part either Component.LOCALNAME or Component.NAMESPACE indicating which
* component of the value is required
* @return either the local name or the namespace URI, in each case as a StringValue
*/
public AtomicValue getComponent(int part) {
if (part == Component.LOCALNAME) {
return (AtomicValue)StringValue.makeRestrictedString(
getLocalName(), BuiltInAtomicType.NCNAME, null);
} else if (part == Component.NAMESPACE) {
return new AnyURIValue(getNamespaceURI());
} else if (part == Component.PREFIX) {
String prefix = getPrefix();
if (prefix.length() == 0) {
return null;
} else {
return (AtomicValue)StringValue.makeRestrictedString(
prefix, BuiltInAtomicType.NCNAME, null);
}
} else {
throw new UnsupportedOperationException("Component of QName must be URI, Local Name, or Prefix");
}
}
/**
* Determine if two QName values are equal. This comparison ignores the prefix part
* of the value.
* @throws ClassCastException if they are not comparable
*/
public boolean equals(Object other) {
return qName.equals(((QNameValue)other).qName);
}
public Comparable getSchemaComparable() {
return new QNameComparable();
}
private class QNameComparable implements Comparable {
public QNameValue getQNameValue() {
return QNameValue.this;
}
public int compareTo(Object o) {
return equals(o) ? 0 : INDETERMINATE_ORDERING;
}
public boolean equals(Object o) {
return (o instanceof QNameComparable && qName.equals(((QNameComparable)o).getQNameValue().qName));
}
public int hashCode() {
return qName.hashCode();
}
}
}
//
// 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.
//
// Contributor(s):
//