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/* XMLSchemaBuilder.java --

   Copyright (C) 2006  Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package gnu.xml.validation.xmlschema;

import java.util.LinkedHashSet;

import java.util.Set;

import java.util.StringTokenizer;

import javax.xml.XMLConstants;

import javax.xml.namespace.QName;

import org.relaxng.datatype.DatatypeException;

import org.relaxng.datatype.DatatypeLibrary;

import org.relaxng.datatype.helpers.DatatypeLibraryLoader;

import org.w3c.dom.NamedNodeMap;

import org.w3c.dom.Node;

import gnu.xml.validation.datatype.Annotation;

import gnu.xml.validation.datatype.SimpleType;

import gnu.xml.validation.datatype.Type;

/**

 * Parses an XML Schema DOM tree, constructing a compiled internal

 * representation.

 *

 * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>

 */

class XMLSchemaBuilder

{

  XMLSchema schema;

  final DatatypeLibrary typeLibrary;

  XMLSchemaBuilder()

  {

    final String ns = XMLConstants.W3C_XML_SCHEMA_NS_URI;

    typeLibrary = new DatatypeLibraryLoader().createDatatypeLibrary(ns);

  }

  void parseSchema(Node node)

    throws DatatypeException

  {

    String uri = node.getNamespaceURI();

    String name = node.getLocalName();

    if (XMLConstants.W3C_XML_SCHEMA_NS_URI.equals(uri) &&

        node.getNodeType() == Node.ELEMENT_NODE)

      {

        if ("schema".equals(name))

          {

            NamedNodeMap attrs = node.getAttributes();

            String targetNamespace = getAttribute(attrs, "targetNamespace");

            String version = getAttribute(attrs, "version");

            String fd = getAttribute(attrs, "finalDefault");

            int finalDefault = parseFullDerivationSet(fd);

            String bd = getAttribute(attrs, "blockDefault");

            int blockDefault = parseBlockSet(bd);

            String afd = getAttribute(attrs, "attributeFormDefault");

            boolean attributeFormQualified = "qualified".equals(afd);

            String efd = getAttribute(attrs, "elementFormDefault");

            boolean elementFormQualified = "qualified".equals(efd);

            schema = new XMLSchema(targetNamespace, version,

                                   finalDefault, blockDefault,

                                   attributeFormQualified,

                                   elementFormQualified);

            for (Node child = node.getFirstChild(); child != null;

                 child = child.getNextSibling())

              {

                parseTopLevelElement(child);

              }

            return;

          }

      }

    // TODO throw schema exception

  }

  void parseTopLevelElement(Node node)

    throws DatatypeException

  {

    String uri = node.getNamespaceURI();

    String name = node.getLocalName();

    if (XMLConstants.W3C_XML_SCHEMA_NS_URI.equals(uri) &&

        node.getNodeType() == Node.ELEMENT_NODE)

      {

        if ("element".equals(name))

          {

            ElementDeclaration ed =

              (ElementDeclaration) parseElement(node, null);

            schema.elementDeclarations.put(ed.name, ed);

            // TODO

          }

        else if ("attribute".equals(name))

          {

            AttributeDeclaration ad =

              (AttributeDeclaration) parseAttribute(node, true);

            schema.attributeDeclarations.put(ad.name, ad);

            // TODO

          }

        else if ("type".equals(name))

          {

            // TODO

          }

        else if ("group".equals(name))

          {

            // TODO

          }

        else if ("attributeGroup".equals(name))

          {

            // TODO

          }

        else if ("notation".equals(name))

          {

            // TODO

          }

        else if ("identityConstraint".equals(name))

          {

            // TODO

          }

      }

    // TODO throw schema exception

  }

  Object parseAttribute(Node node, boolean scope)

    throws DatatypeException

  {

    NamedNodeMap attrs = node.getAttributes();

    String def = getAttribute(attrs, "default");

    String fixed = getAttribute(attrs, "fixed");

    int constraintType = AttributeDeclaration.NONE;

    String constraintValue = null;

    if (def != null)

      {

        constraintType = AttributeDeclaration.DEFAULT;

        constraintValue = def;

      }

    else if (fixed != null)

      {

        constraintType = AttributeDeclaration.FIXED;

        constraintValue = fixed;

      }

    // TODO form = (qualified | unqualified)

    String attrName = getAttribute(attrs, "name");

    String attrNamespace = getAttribute(attrs, "targetNamespace");

    String ref = getAttribute(attrs, "ref");

    String use = getAttribute(attrs, "use");

    String type = getAttribute(attrs, "type");

    SimpleType datatype = (type == null) ? null :

      parseSimpleType(asQName(type, node));

    Annotation annotation = null;

    for (Node child = node.getFirstChild(); child != null;

         child = child.getNextSibling())

      {

        String uri = child.getNamespaceURI();

        String name = child.getLocalName();

        if (XMLConstants.W3C_XML_SCHEMA_NS_URI.equals(uri) &&

            child.getNodeType() == Node.ELEMENT_NODE)

          {

            if ("annotation".equals(name))

              {

                annotation = parseAnnotation(child);

              }

            else if ("simpleType".equals(name))

              {

                datatype = parseSimpleType(child);

              }

            else

              {

                // TODO throw schema exception

              }

          }

      }

    if (scope)

      {

        return new AttributeDeclaration(scope,

                                        constraintType,

                                        constraintValue,

                                        new QName(attrNamespace, attrName),

                                        datatype,

                                        annotation);

      }

    else

      {

        boolean required = "required".equals(use);

        // TODO ref

        AttributeDeclaration decl = (ref == null) ?

              new AttributeDeclaration(scope,

                                       AttributeDeclaration.NONE,

                                       null,

                                       new QName(attrNamespace, attrName),

                                       datatype,

                                       annotation) :

              /*schema.getAttributeDeclaration(ref)*/ null;

        return new AttributeUse(required,

                                constraintType,

                                constraintValue,

                                decl);

      }

  }

  int parseFullDerivationSet(String value)

  {

    int ret = XMLSchema.FINAL_NONE;

    if ("#all".equals(value))

      {

        ret = XMLSchema.FINAL_ALL;

      }

    else

      {

        StringTokenizer st = new StringTokenizer(value, " ");

        while (st.hasMoreTokens())

          {

            String token = st.nextToken();

            if ("extension".equals(token))

              {

                ret |= XMLSchema.FINAL_EXTENSION;

              }

            else if ("restriction".equals(token))

              {

                ret |= XMLSchema.FINAL_RESTRICTION;

              }

            else if ("list".equals(token))

              {

                ret |= XMLSchema.FINAL_LIST;

              }

            else if ("union".equals(token))

              {

                ret |= XMLSchema.FINAL_UNION;

              }

          }

      }

    return ret;

  }

  int parseSimpleTypeDerivationSet(String value)

  {

    int ret = XMLSchema.FINAL_NONE;

    if ("#all".equals(value))

      {

        ret = XMLSchema.FINAL_LIST |

          XMLSchema.FINAL_UNION |

          XMLSchema.FINAL_RESTRICTION;

      }

    else

      {

        StringTokenizer st = new StringTokenizer(value, " ");

        while (st.hasMoreTokens())

          {

            String token = st.nextToken();

            if ("list".equals(token))

              {

                ret |= XMLSchema.FINAL_LIST;

              }

            else if ("union".equals(token))

              {

                ret |= XMLSchema.FINAL_UNION;

              }

            else if ("restriction".equals(token))

              {

                ret |= XMLSchema.FINAL_RESTRICTION;

              }

          }

      }

    return ret;

  }

  int parseComplexTypeDerivationSet(String value)

  {

    int ret = XMLSchema.FINAL_NONE;

    if ("#all".equals(value))

      {

        ret = XMLSchema.FINAL_EXTENSION | XMLSchema.FINAL_RESTRICTION;

      }

    else

      {

        StringTokenizer st = new StringTokenizer(value, " ");

        while (st.hasMoreTokens())

          {

            String token = st.nextToken();

            if ("extension".equals(token))

              {

                ret |= XMLSchema.FINAL_EXTENSION;

              }

            else if ("restriction".equals(token))

              {

                ret |= XMLSchema.FINAL_RESTRICTION;

              }

          }

      }

    return ret;

  }

  int parseBlockSet(String value)

  {

    int ret = XMLSchema.BLOCK_NONE;

    if ("#all".equals(value))

      {

        ret = XMLSchema.BLOCK_ALL;

      }

    else

      {

        StringTokenizer st = new StringTokenizer(value, " ");

        while (st.hasMoreTokens())

          {

            String token = st.nextToken();

            if ("extension".equals(token))

              {

                ret |= XMLSchema.BLOCK_EXTENSION;

              }

            else if ("restriction".equals(token))

              {

                ret |= XMLSchema.BLOCK_RESTRICTION;

              }

            else if ("substitution".equals(token))

              {

                ret |= XMLSchema.BLOCK_SUBSTITUTION;

              }

          }

      }

    return ret;

  }

  int parseComplexTypeBlockSet(String value)

  {

    int ret = XMLSchema.BLOCK_NONE;

    if ("#all".equals(value))

      {

        ret = XMLSchema.BLOCK_EXTENSION | XMLSchema.BLOCK_RESTRICTION;

      }

    else

      {

        StringTokenizer st = new StringTokenizer(value, " ");

        while (st.hasMoreTokens())

          {

            String token = st.nextToken();

            if ("extension".equals(token))

              {

                ret |= XMLSchema.BLOCK_EXTENSION;

              }

            else if ("restriction".equals(token))

              {

                ret |= XMLSchema.BLOCK_RESTRICTION;

              }

          }

      }

    return ret;

  }

  Object parseElement(Node node, ElementDeclaration parent)

    throws DatatypeException

  {

    NamedNodeMap attrs = node.getAttributes();

    Integer minOccurs = null;

    Integer maxOccurs = null;

    Node parentNode = node.getParentNode();

    boolean notTopLevel = !"schema".equals(parentNode.getLocalName());

    if (notTopLevel)

      {

        String ref = getAttribute(attrs, "ref");

        if (ref != null)

          {

            minOccurs = getOccurrence(getAttribute(attrs, "minOccurs"));

            maxOccurs = getOccurrence(getAttribute(attrs, "maxOccurs"));

            // TODO resolve top-level element declaration

            ElementDeclaration ad = null;

            return new Particle(minOccurs, maxOccurs, ad);

          }

      }

    String elementName = getAttribute(attrs, "name");

    String elementNamespace = getAttribute(attrs, "targetNamespace");

    String type = getAttribute(attrs, "type");

    Type datatype = (type != null) ?

      parseSimpleType(asQName(type, node)) : null;

    int scope = (parent == null) ?

      XMLSchema.GLOBAL :

      XMLSchema.LOCAL;

    String def = getAttribute(attrs, "default");

    String fixed = getAttribute(attrs, "fixed");

    int constraintType = AttributeDeclaration.NONE;

    String constraintValue = null;

    if (def != null)

      {

        constraintType = AttributeDeclaration.DEFAULT;

        constraintValue = def;

      }

    else if (fixed != null)

      {

        constraintType = AttributeDeclaration.FIXED;

        constraintValue = fixed;

      }

    String sg = getAttribute(attrs, "substitutionGroup");

    QName substitutionGroup = QName.valueOf(sg);

    String sgPrefix = substitutionGroup.getPrefix();

    if (sgPrefix != null && !"".equals(sgPrefix))

      {

        String sgName = substitutionGroup.getLocalPart();

        String sgNamespace = node.lookupNamespaceURI(sgPrefix);

        substitutionGroup = new QName(sgNamespace, sgName);

      }

    String block = getAttribute(attrs, "block");

    int substitutionGroupExclusions = (block == null) ?

      schema.blockDefault :

      parseBlockSet(block);

    String final_ = getAttribute(attrs, "final");

    int disallowedSubstitutions = (final_ == null) ?

      schema.finalDefault :

      parseFullDerivationSet(final_);

    boolean nillable = "true".equals(getAttribute(attrs, "nillable"));

    boolean isAbstract = "true".equals(getAttribute(attrs, "abstract"));

    if (notTopLevel)

      {

        minOccurs = getOccurrence(getAttribute(attrs, "minOccurs"));

        maxOccurs = getOccurrence(getAttribute(attrs, "maxOccurs"));

        String form = getAttribute(attrs, "form");

        if (form != null)

          {

            if ("qualified".equals(form))

              {

                elementNamespace = schema.targetNamespace;

              }

          }

        else if (schema.elementFormQualified)

          {

            elementNamespace = schema.targetNamespace;

          }

      }

    ElementDeclaration ed =

      new ElementDeclaration(new QName(elementNamespace, elementName),

                             datatype,

                             scope, parent,

                             constraintType, constraintValue,

                             nillable,

                             substitutionGroup,

                             substitutionGroupExclusions,

                             disallowedSubstitutions,

                             isAbstract);

    for (Node child = node.getFirstChild(); child != null;

         child = child.getNextSibling())

      {

        String uri = child.getNamespaceURI();

        String name = child.getLocalName();

        if (XMLConstants.W3C_XML_SCHEMA_NS_URI.equals(uri) &&

            child.getNodeType() == Node.ELEMENT_NODE)

          {

            if ("annotation".equals(name))

              {

                ed.annotation = parseAnnotation(child);

              }

            else if ("simpleType".equals(name) && datatype == null)

              {

                ed.datatype = parseSimpleType(child);

              }

            else if ("complexType".equals(name) && datatype == null)

              {

                ed.datatype = parseComplexType(child, ed);

              }

            else

              {

                // throw schema exception

              }

          }

      }

    if (notTopLevel)

      {

        return new Particle(minOccurs, maxOccurs, ed);

      }

    else

      {

        return ed;

      }

  }

  Integer getOccurrence(String value)

  {

    if (value == null)

      {

        return new Integer(1);

      }

    else if ("unbounded".equals(value))

      {

        return null;

      }

    else

      {

        return new Integer(value);

      }

  }

  SimpleType parseSimpleType(QName typeName)

    throws DatatypeException

  {

    SimpleType type = (SimpleType) schema.types.get(typeName);

    if (!XMLConstants.W3C_XML_SCHEMA_NS_URI.equals(typeName.getNamespaceURI()))

      return null;

    String localName = typeName.getLocalPart();

    return (SimpleType) typeLibrary.createDatatype(localName);

  }

  SimpleType parseSimpleType(Node simpleType)

    throws DatatypeException

  {

    NamedNodeMap attrs = simpleType.getAttributes();

    String typeFinal = getAttribute(attrs, "final");

    if (typeFinal == null)

      {

        Node schema = simpleType.getParentNode();

        while (schema != null && !"schema".equals(schema.getLocalName()))

          {

            schema = schema.getParentNode();

          }

        if (schema != null)

          {

            NamedNodeMap schemaAttrs = schema.getAttributes();

            typeFinal = getAttribute(schemaAttrs, "finalDefault");

          }

      }

    int typeFinality = parseSimpleTypeDerivationSet(typeFinal);

    QName typeName = asQName(getAttribute(attrs, "name"), simpleType);

    int variety = 0;

    Set facets = new LinkedHashSet();

    int fundamentalFacets = 0; // TODO

    SimpleType baseType = null; // TODO

    Annotation annotation = null;

    // TODO use DatatypeBuilder

    for (Node child = simpleType.getFirstChild(); child != null;

         child = child.getNextSibling())

      {

        String uri = child.getNamespaceURI();

        String name = child.getLocalName();

        if (XMLConstants.W3C_XML_SCHEMA_NS_URI.equals(uri) &&

            child.getNodeType() == Node.ELEMENT_NODE)

          {

            if ("annotation".equals(name))

              {

                annotation = parseAnnotation(child);

              }

            else if ("restriction".equals(name))

              {

                // TODO

              }

            else if ("list".equals(name))

              {

                variety = SimpleType.LIST;

                // TODO

              }

            else if ("union".equals(name))

              {

                variety = SimpleType.UNION;

                // TODO

              }

          }

      }

    return new SimpleType(typeName, variety, facets, fundamentalFacets,

                          baseType, annotation);

  }

  Type parseComplexType(Node complexType, ElementDeclaration parent)

    throws DatatypeException

  {

    NamedNodeMap attrs = complexType.getAttributes();

    QName typeName = asQName(getAttribute(attrs, "name"), complexType);

    boolean isAbstract = "true".equals(getAttribute(attrs, "abstract"));

    String block = getAttribute(attrs, "block");

    int prohibitedSubstitutions = (block == null) ?

      schema.blockDefault :

      parseComplexTypeBlockSet(block);

    String final_ = getAttribute(attrs, "final");

    int finality = (final_ == null) ?

      schema.finalDefault :

      parseComplexTypeDerivationSet(final_);

    ComplexType type = new ComplexType(typeName, isAbstract,

                                       prohibitedSubstitutions, finality);

    boolean mixed = "true".equals(getAttribute(attrs, "mixed"));

    for (Node child = complexType.getFirstChild(); child != null;

         child = child.getNextSibling())

      {

        String uri = child.getNamespaceURI();

        String name = child.getLocalName();

        if (XMLConstants.W3C_XML_SCHEMA_NS_URI.equals(uri) &&

            child.getNodeType() == Node.ELEMENT_NODE)

          {

            if ("simpleContent".equals(name))

              {

                parseSimpleContent(child, type);

              }

          }

      }

    if (mixed)

      {

        type.contentType = XMLSchema.CONTENT_MIXED;

      }

    return type;

  }

  void parseSimpleContent(Node simpleContent, ComplexType type)

    throws DatatypeException

  {

    for (Node child = simpleContent.getFirstChild(); child != null;

         child = child.getNextSibling())

      {

        String uri = child.getNamespaceURI();

        String name = child.getLocalName();

        if (XMLConstants.W3C_XML_SCHEMA_NS_URI.equals(uri) &&

            child.getNodeType() == Node.ELEMENT_NODE)

          {

            if ("annotation".equals(name))

              {

                type.annotations.add(parseAnnotation(child));

              }

            else if ("restriction".equals(name))

              {

                type.derivationMethod = XMLSchema.FINAL_RESTRICTION;

                parseRestriction(child, type);

              }

            else if ("extension".equals(name))