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'Databene Formats' is an open source software library for supporting
data file and other formats like CSV, fixed width files, XLS, Properties and Regex.
It is designed for multithreaded use and high performance.
/*
* Copyright (C) 2011-2014 Volker Bergmann ([email protected]).
* All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.databene.formats.xsd;
import org.databene.commons.StringUtil;
import org.databene.commons.xml.XMLUtil;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
/**
* Parses XML schemas and provides an representation by a {@link Schema} obejct.
* Created: 16.05.2014 18:29:01
* @since 0.8.2
* @author Volker Bergmann
*/
public class SchemaParser {
public Schema parse(Document document) {
Element root = document.getDocumentElement();
return parseSchema(root);
}
private Schema parseSchema(Element root) {
Schema schema = new Schema();
for (Element child : XMLUtil.getChildElements(root)) {
String childName = child.getLocalName();
if ("annotation".equals(childName))
schema.setDocumentation(parseAnnotationDocumentation(child));
else if ("simpleType".equals(childName))
schema.addSimpleType(parseSimpleType(child));
else if ("complexType".equals(childName))
schema.addComplexType(parseComplexType(child, schema));
else if ("element".equals(childName))
schema.setMember(parseElement(child, schema));
else
throw new UnsupportedOperationException("Not a supported child of 'schema': " + childName);
}
return schema;
}
private static String parseAnnotationDocumentation(Element element) {
for (Element child : XMLUtil.getChildElements(element)) {
String childName = child.getLocalName();
if ("documentation".equals(childName))
return child.getTextContent();
}
return null;
}
private static SimpleType parseSimpleType(Element element) {
SimpleType simpleType = new SimpleType(element.getAttribute("name"));
// TODO parse simple schema type info
return simpleType;
}
private ComplexType parseComplexType(Element element, Schema schema) {
Element simpleContent = XMLUtil.getChildElement(element, false, false, "simpleContent");
if (simpleContent != null)
return parseComplexTypeWithSimpleContent(element);
Element sequence = XMLUtil.getChildElement(element, false, false, "sequence");
if (sequence != null)
return parseComplexTypeWithSequence(element, schema);
throw new UnsupportedOperationException("Not a supported kind of 'complexType': " + element.getAttribute("name"));
}
private ComplexType parseComplexTypeWithSimpleContent(Element element) {
String name = XMLUtil.getAttribute(element, "name", false);
PlainComplexType type = new PlainComplexType(name);
for (Element child : XMLUtil.getChildElements(element)) {
String childName = child.getLocalName();
if ("simpleContent".equals(childName))
parseSimpleContent(child, type);
else if ("attribute".equals(childName))
type.addAttribute(parseAttribute(child));
else
throw new UnsupportedOperationException("Not a supported child of '" + element.getNodeName() + "': " + childName);
}
return type;
}
private void parseSimpleContent(Element child, PlainComplexType type) {
// TODO parse simple schema content
}
private ComplexType parseComplexTypeWithSequence(Element element, Schema schema) {
String name = XMLUtil.getAttribute(element, "name", false);
CompositeComplexType type = new CompositeComplexType(name);
for (Element child : XMLUtil.getChildElements(element)) {
String childName = child.getLocalName();
if ("sequence".equals(childName))
parseSequence(child, type, schema);
else if ("attribute".equals(childName))
type.addAttribute(parseAttribute(child));
else
throw new UnsupportedOperationException("Not a supported child of '" + element.getNodeName() + "': " + childName);
}
return type;
}
private void parseSequence(Element element, CompositeComplexType complexType, Schema schema) {
for (Element child : XMLUtil.getChildElements(element)) {
String childName = child.getLocalName();
if ("element".equals(childName))
complexType.addMember(parseElement(child, schema));
else
throw new UnsupportedOperationException("Not a supported child of 'element': " + childName);
}
}
private static Attribute parseAttribute(Element child) {
String name = XMLUtil.getAttribute(child, "name", true);
return new Attribute(name);
}
private ComplexMember parseElement(Element element, Schema schema) {
String name = element.getAttribute("name");
ComplexMember member = new ComplexMember(name, null);
ComplexType type = null;
for (Element child : XMLUtil.getChildElements(element)) {
String childName = child.getLocalName();
if ("complexType".equals(childName))
type = parseComplexType(child, schema);
else if ("annotation".equals(childName))
member.setDocumentation(parseAnnotationDocumentation(child));
else
throw new UnsupportedOperationException("Not a supported child of 'element': " + childName);
}
if (type == null) {
String typeName = XMLUtil.getAttribute(element, "type", true);
type = schema.getComplexType(typeName);
}
member.setType(type);
member.setMinCardinality(parseOccursAttribute(element, "minOccurs"));
member.setMaxCardinality(parseOccursAttribute(element, "maxOccurs"));
return member;
}
private static int parseOccursAttribute(Element element, String name) {
String stringValue = element.getAttribute(name);
if (StringUtil.isEmpty(stringValue))
return 1;
else if ("unbounded".equals(stringValue))
return -1;
else
return Integer.parseInt(stringValue);
}
}