/**
* Redistribution and use of this software and associated documentation
* ("Software"), with or without modification, are permitted provided
* that the following conditions are met:
*
* 1. Redistributions of source code must retain copyright
* statements and notices. Redistributions must also contain a
* copy of this document.
*
* 2. Redistributions in binary form must reproduce the
* above copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* 3. The name "Exolab" must not be used to endorse or promote
* products derived from this Software without prior written
* permission of Intalio, Inc. For written permission,
* please contact info@exolab.org.
*
* 4. Products derived from this Software may not be called "Exolab"
* nor may "Exolab" appear in their names without prior written
* permission of Intalio, Inc. Exolab is a registered
* trademark of Intalio, Inc.
*
* 5. Due credit should be given to the Exolab Project
* (http://www.exolab.org/).
*
* THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
* NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* INTALIO, INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Copyright 2001-2002 (C) Intalio Inc. All Rights Reserved.
*
* $Id$
*/
package org.exolab.castor.xml.schema.reader;
//-- imported classes and packages
import org.exolab.castor.xml.AttributeSet;
import org.exolab.castor.xml.Namespaces;
import org.exolab.castor.xml.XMLException;
import org.exolab.castor.xml.schema.Annotation;
import org.exolab.castor.xml.schema.IdentityConstraint;
import org.exolab.castor.xml.schema.IdentityField;
import org.exolab.castor.xml.schema.IdentitySelector;
import org.exolab.castor.xml.schema.Key;
import org.exolab.castor.xml.schema.KeyRef;
import org.exolab.castor.xml.schema.SchemaContext;
import org.exolab.castor.xml.schema.SchemaNames;
import org.exolab.castor.xml.schema.Unique;
/**
* A class for Unmarshalling Identity Constraints
*
* @author <a href="mailto:kvisco@intalio.com">Keith Visco</a>
* @version $Revision$ $Date: 2003-03-03 00:05:44 -0700 (Mon, 03 Mar 2003) $
**/
public class IdentityConstraintUnmarshaller extends ComponentReader {
//--------------------/
//- Member Variables -/
//--------------------/
/**
* The current ComponentReader
**/
private ComponentReader _unmarshaller;
/**
* The current branch depth
**/
private int _depth = 0;
/**
* The IdentityConstraint we are unmarshalling
**/
private IdentityConstraint _identityConstraint = null;
private boolean _foundAnnotation = false;
private boolean _foundSelector = false;
private boolean _foundField = false;
private String _elementName = null;
//----------------/
//- Constructors -/
//----------------/
/**
* Creates a new IdentityConstraintUnmarshaller.
*
* @param schemaContext the {@link SchemaContext} to get some configuration settings from
* @param elementName the resolver being used for reference resolving
* @param atts the AttributeList
**/
public IdentityConstraintUnmarshaller(
final SchemaContext schemaContext,
final String elementName,
final AttributeSet atts)
throws XMLException {
super(schemaContext);
_elementName = elementName;
String name = atts.getValue(SchemaNames.NAME_ATTR);
if (name == null) {
error("The 'name' attribute for an identity-constraint must exist.");
}
atts.getValue(SchemaNames.ID_ATTR);
//-- keyref
if (SchemaNames.KEYREF.equals(elementName)) {
String refer = atts.getValue("refer");
if (refer == null) {
error("The 'refer' attribute for keyref must exist.");
}
_identityConstraint = new KeyRef(name, refer);
}
//-- unique
else if (SchemaNames.UNIQUE.equals(elementName)) {
_identityConstraint = new Unique(name);
}
//-- key
else {
_identityConstraint = new Key(name);
}
} //-- IdentityConstraintUnmarshaller
//-----------/
//- Methods -/
//-----------/
/**
* Returns the name of the element that this ComponentReader
* handles
* @return the name of the element that this ComponentReader
* handles
**/
public String elementName() {
return _elementName;
} //-- elementName
/**
* Returns the IdentityConstraint created.
*
* @return the IdentityConstraint created.
**/
public IdentityConstraint getIdentityConstraint() {
return _identityConstraint;
} //-- getIdentityConstraint
/**
* Returns the Object created by this ComponentReader
*
* @return the Object created by this ComponentReader
**/
public Object getObject() {
return getIdentityConstraint();
} //-- getObject
public void finish() throws XMLException {
if (!_foundSelector) {
error ("Invalid " + _elementName + "; missing 'selector'.");
}
else if (!_foundField) {
error ("Invalid " + _elementName + "; missing 'field'.");
}
} //-- finish
/**
* Signals the start of an element with the given name.
*
* @param name the NCName of the element. It is an error
* if the name is a QName (ie. contains a prefix).
* @param namespace the namespace of the element. This may be null.
* Note: A null namespace is not the same as the default namespace unless
* the default namespace is also null.
* @param atts the AttributeSet containing the attributes associated
* with the element.
* @param nsDecls the namespace declarations being declared for this
* element. This may be null.
**/
public void startElement(String name, String namespace, AttributeSet atts,
Namespaces nsDecls)
throws XMLException
{
//-- Do delagation if necessary
if (_unmarshaller != null) {
_unmarshaller.startElement(name, namespace, atts, nsDecls);
++_depth;
return;
}
if (SchemaNames.ANNOTATION.equals(name)) {
if (_foundAnnotation)
error("Only one (1) annotation may appear as a child of '" +
_elementName + "'.");
if (_foundSelector || _foundField)
error("An annotation may only appear as the first child of '"+
_elementName + "'.");
_foundAnnotation = true;
_unmarshaller = new AnnotationUnmarshaller(getSchemaContext(), atts);
}
else if (SchemaNames.SELECTOR.equals(name)) {
if (_foundField) {
String err = "The 'selector' element of '" + _elementName +
"' must appear before any 'field' elements.";
error(err);
}
if (_foundSelector)
error("Only one (1) 'selector' may appear as a child of '" +
_elementName + "'.");
_foundSelector = true;
_unmarshaller = new FieldOrSelectorUnmarshaller(getSchemaContext(), name, atts);
}
else if (SchemaNames.FIELD.equals(name)) {
_foundField = true;
_unmarshaller = new FieldOrSelectorUnmarshaller(getSchemaContext(), name, atts);
}
else illegalElement(name);
} //-- startElement
/**
* Signals to end of the element with the given name.
*
* @param name the NCName of the element. It is an error
* if the name is a QName (ie. contains a prefix).
* @param namespace the namespace of the element.
**/
public void endElement(String name, String namespace)
throws XMLException
{
//-- Do delagation if necessary
if ((_unmarshaller != null) && (_depth > 0)) {
_unmarshaller.endElement(name, namespace);
--_depth;
return;
}
//-- have unmarshaller perform any necessary clean up
_unmarshaller.finish();
if (SchemaNames.ANNOTATION.equals(name)) {
Annotation annotation = (Annotation)_unmarshaller.getObject();
_identityConstraint.addAnnotation(annotation);
}
else if (SchemaNames.SELECTOR.equals(name)) {
IdentitySelector selector
= (IdentitySelector)_unmarshaller.getObject();
_identityConstraint.setSelector(selector);
}
else if (SchemaNames.FIELD.equals(name)) {
IdentityField field
= (IdentityField)_unmarshaller.getObject();
_identityConstraint.addField(field);
}
_unmarshaller = null;
} //-- endElement
public void characters(char[] ch, int start, int length)
throws XMLException
{
//-- Do delagation if necessary
if (_unmarshaller != null) {
_unmarshaller.characters(ch, start, length);
}
} //-- characters
} //-- IdentityConstraintUnmarshaller