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/**
 * Copyright (C) 2014-2020 Philip Helger (www.helger.com)
 * philip[at]helger[dot]com
 *
 * 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 com.helger.schematron.pure.exchange;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.EntityResolver;

import com.helger.commons.ValueEnforcer;
import com.helger.commons.error.SingleError;
import com.helger.commons.io.resource.IReadableResource;
import com.helger.commons.location.SimpleLocation;
import com.helger.commons.string.StringParser;
import com.helger.commons.string.ToStringGenerator;
import com.helger.schematron.CSchematron;
import com.helger.schematron.CSchematronXML;
import com.helger.schematron.SchematronDebug;
import com.helger.schematron.SchematronHelper;
import com.helger.schematron.pure.errorhandler.IPSErrorHandler;
import com.helger.schematron.pure.errorhandler.LoggingPSErrorHandler;
import com.helger.schematron.pure.model.*;
import com.helger.schematron.pure.model.PSDir.EDirValue;
import com.helger.schematron.pure.model.PSRichGroup.ESpace;
import com.helger.xml.microdom.IMicroDocument;
import com.helger.xml.microdom.IMicroElement;
import com.helger.xml.microdom.IMicroText;
import com.helger.xml.microdom.serialize.MicroWriter;
import com.helger.xml.serialize.read.SAXReaderSettings;

import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;

/**
 * Utility class for reading all Schematron elements from a resource.
 *
 * @author Philip Helger
 */
@Immutable
@SuppressFBWarnings ("JCIP_FIELD_ISNT_FINAL_IN_IMMUTABLE_CLASS")
public class PSReader
{
  private static final Logger LOGGER = LoggerFactory.getLogger (PSReader.class);

  private final IReadableResource m_aResource;
  private final IPSErrorHandler m_aErrorHandler;
  private final EntityResolver m_aEntityResolver;
  private boolean m_bLenient = CSchematron.DEFAULT_ALLOW_DEPRECATED_NAMESPACES;

  /**
   * Constructor without an error handler
   *
   * @param aResource
   *        The resource to read the Schematron from. May not be
   *        null.
   */
  public PSReader (@Nonnull final IReadableResource aResource)
  {
    this (aResource, null, null);
  }

  /**
   * Constructor with an error handler
   *
   * @param aResource
   *        The resource to read the Schematron from. May not be
   *        null.
   * @param aErrorHandler
   *        The error handler to use. May be null. If the error
   *        handler is null a {@link LoggingPSErrorHandler} is
   *        automatically created and used.
   * @param aEntityResolver
   *        The XML entity resolver to be used. May be null.
   * @since 4.1.1
   */
  public PSReader (@Nonnull final IReadableResource aResource,
                   @Nullable final IPSErrorHandler aErrorHandler,
                   @Nullable final EntityResolver aEntityResolver)
  {
    ValueEnforcer.notNull (aResource, "Resource");
    m_aResource = aResource;
    m_aErrorHandler = aErrorHandler != null ? aErrorHandler : new LoggingPSErrorHandler ();
    m_aEntityResolver = aEntityResolver;
  }

  /**
   * @return The resource from which the Schematron schema is read. Never
   *         null.
   */
  @Nonnull
  public final IReadableResource getResource ()
  {
    return m_aResource;
  }

  /**
   * @return The error handler used. If no error handler was passed in the
   *         constructor, than a {@link LoggingPSErrorHandler} is automatically
   *         used.
   */
  @Nonnull
  public final IPSErrorHandler getErrorHandler ()
  {
    return m_aErrorHandler;
  }

  /**
   * @return true if the old Schematron namespace is supported,
   *         false if not.
   * @since 5.4.1
   */
  public final boolean isLenient ()
  {
    return m_bLenient;
  }

  /**
   * Allow or disallow the support for old namespace prefix. By default this is
   * deprecated.
   *
   * @param bLenient
   *        true to enable support for old namespace URIs.
   * @return this for chaining
   * @since 5.4.1
   */
  @Nonnull
  public final PSReader setLenient (final boolean bLenient)
  {
    m_bLenient = bLenient;
    return this;
  }

  /**
   * Utility method to get a real attribute value, by trimming spaces, if the
   * value is non-null.
   *
   * @param sAttrValue
   *        The source attribute value. May be null.
   * @return null if the input parameter is null.
   */
  @Nullable
  private static String _getAttributeValue (@Nullable final String sAttrValue)
  {
    return sAttrValue == null ? null : sAttrValue.trim ();
  }

  /**
   * Emit a warning with the registered error handler.
   *
   * @param aSourceElement
   *        The source element where the error occurred.
   * @param sMessage
   *        The main warning message.
   */
  private void _warn (@Nonnull final IPSElement aSourceElement, @Nonnull final String sMessage)
  {
    ValueEnforcer.notNull (aSourceElement, "SourceElement");
    ValueEnforcer.notNull (sMessage, "Message");

    m_aErrorHandler.handleError (SingleError.builderWarn ()
                                            .setErrorLocation (new SimpleLocation (m_aResource.getPath ()))
                                            .setErrorFieldName (IPSErrorHandler.getErrorFieldName (aSourceElement))
                                            .setErrorText (sMessage)
                                            .build ());
  }

  /**
   * Read an <active> element
   *
   * @param eActive
   *        The source micro element. Never null.
   * @return The created domain object. May not be null.
   */
  @Nonnull
  public PSActive readActiveFromXML (@Nonnull final IMicroElement eActive)
  {
    final PSActive ret = new PSActive ();
    eActive.forAllAttributes ( (sNS, sAttrName, sVal) -> {
      final String sAttrValue = _getAttributeValue (sVal);
      if (sAttrName.equals (CSchematronXML.ATTR_PATTERN))
        ret.setPattern (sAttrValue);
      else
        ret.addForeignAttribute (sAttrName, sAttrValue);
    });

    eActive.forAllChildren (aActiveChild -> {
      switch (aActiveChild.getType ())
      {
        case TEXT:
          ret.addText (((IMicroText) aActiveChild).getNodeValue ());
          break;
        case ELEMENT:
          final IMicroElement eElement = (IMicroElement) aActiveChild;
          if (isValidSchematronNS (eElement.getNamespaceURI ()))
          {
            final String sLocalName = eElement.getLocalName ();
            if (sLocalName.equals (CSchematronXML.ELEMENT_DIR))
              ret.addDir (readDirFromXML (eElement));
            else
              if (sLocalName.equals (CSchematronXML.ELEMENT_EMPH))
                ret.addEmph (readEmphFromXML (eElement));
              else
                if (sLocalName.equals (CSchematronXML.ELEMENT_SPAN))
                  ret.addSpan (readSpanFromXML (eElement));
                else
                  _warn (ret, "Unsupported Schematron element '" + sLocalName + "'");
          }
          else
            ret.addForeignElement (eElement.getClone ());

          break;
        case COMMENT:
          // Ignore comments
          break;
        default:
          _warn (ret, "Unsupported child node: " + aActiveChild);
      }
    });
    return ret;
  }

  private void _handleRichGroup (@Nonnull final String sAttrName, @Nonnull final String sAttrValue, @Nonnull final PSRichGroup aRichGroup)
  {
    if (sAttrName.equals (CSchematronXML.ATTR_ICON))
      aRichGroup.setIcon (sAttrValue);
    else
      if (sAttrName.equals (CSchematronXML.ATTR_SEE))
        aRichGroup.setSee (sAttrValue);
      else
        if (sAttrName.equals (CSchematronXML.ATTR_FPI))
          aRichGroup.setFPI (sAttrValue);
        else
          if (sAttrName.equals (CSchematronXML.ATTR_XML_LANG))
            aRichGroup.setXmlLang (sAttrValue);
          else
            if (sAttrName.equals (CSchematronXML.ATTR_XML_SPACE))
              aRichGroup.setXmlSpace (ESpace.getFromIDOrNull (sAttrValue));
  }

  private void _handleLinkableGroup (@Nonnull final String sAttrName,
                                     @Nonnull final String sAttrValue,
                                     @Nonnull final PSLinkableGroup aLinkableGroup)
  {
    if (sAttrName.equals (CSchematronXML.ATTR_ROLE))
      aLinkableGroup.setRole (sAttrValue);
    else
      if (sAttrName.equals (CSchematronXML.ATTR_SUBJECT))
        aLinkableGroup.setSubject (sAttrValue);
  }

  /**
   * Read an <assert> or a <report> element
   *
   * @param eAssertReport
   *        The source micro element. Never null.
   * @return The created domain object. May not be null.
   */
  @Nonnull
  public PSAssertReport readAssertReportFromXML (@Nonnull final IMicroElement eAssertReport)
  {
    final PSAssertReport ret = new PSAssertReport (eAssertReport.getLocalName ().equals (CSchematronXML.ELEMENT_ASSERT));

    final PSRichGroup aRichGroup = new PSRichGroup ();
    final PSLinkableGroup aLinkableGroup = new PSLinkableGroup ();
    eAssertReport.forAllAttributes ( (sNS, sAttrName, sVal) -> {
      final String sAttrValue = _getAttributeValue (sVal);
      if (sAttrName.equals (CSchematronXML.ATTR_TEST))
        ret.setTest (sAttrValue);
      else
        if (sAttrName.equals (CSchematronXML.ATTR_FLAG))
          ret.setFlag (sAttrValue);
        else
          if (sAttrName.equals (CSchematronXML.ATTR_ID))
            ret.setID (sAttrValue);
          else
            if (sAttrName.equals (CSchematronXML.ATTR_DIAGNOSTICS))
              ret.setDiagnostics (sAttrValue);
            else
              if (PSRichGroup.isRichAttribute (sAttrName))
                _handleRichGroup (sAttrName, sAttrValue, aRichGroup);
              else
                if (PSLinkableGroup.isLinkableAttribute (sAttrName))
                  _handleLinkableGroup (sAttrName, sAttrValue, aLinkableGroup);
                else
                  ret.addForeignAttribute (sAttrName, sAttrValue);
    });
    ret.setRich (aRichGroup);
    ret.setLinkable (aLinkableGroup);

    eAssertReport.forAllChildren (aAssertReportChild -> {
      switch (aAssertReportChild.getType ())
      {
        case TEXT:
          ret.addText (((IMicroText) aAssertReportChild).getNodeValue ());
          break;
        case ELEMENT:
          final IMicroElement eElement = (IMicroElement) aAssertReportChild;
          if (isValidSchematronNS (eElement.getNamespaceURI ()))
          {
            final String sLocalName = eElement.getLocalName ();
            if (sLocalName.equals (CSchematronXML.ELEMENT_NAME))
              ret.addName (readNameFromXML (eElement));
            else
              if (sLocalName.equals (CSchematronXML.ELEMENT_VALUE_OF))
                ret.addValueOf (readValueOfFromXML (eElement));
              else
                if (sLocalName.equals (CSchematronXML.ELEMENT_EMPH))
                  ret.addEmph (readEmphFromXML (eElement));
                else
                  if (sLocalName.equals (CSchematronXML.ELEMENT_DIR))
                    ret.addDir (readDirFromXML (eElement));
                  else
                    if (sLocalName.equals (CSchematronXML.ELEMENT_SPAN))
                      ret.addSpan (readSpanFromXML (eElement));
                    else
                      _warn (ret, "Unsupported Schematron element '" + sLocalName + "'");
          }
          else
            ret.addForeignElement (eElement.getClone ());

          break;
        case COMMENT:
          // Ignore comments
          break;
        default:
          _warn (ret, "Unsupported child node: " + aAssertReportChild);
      }
    });
    return ret;
  }

  /**
   * Read a <diagnostic> element
   *
   * @param eDiagnostic
   *        The source micro element. Never null.
   * @return The created domain object. May not be null.
   */
  @Nonnull
  public PSDiagnostic readDiagnosticFromXML (@Nonnull final IMicroElement eDiagnostic)
  {
    final PSDiagnostic ret = new PSDiagnostic ();

    final PSRichGroup aRichGroup = new PSRichGroup ();
    eDiagnostic.forAllAttributes ( (sNS, sAttrName, sVal) -> {
      final String sAttrValue = _getAttributeValue (sVal);
      if (sAttrName.equals (CSchematronXML.ATTR_ID))
        ret.setID (sAttrValue);
      else
        if (PSRichGroup.isRichAttribute (sAttrName))
          _handleRichGroup (sAttrName, sAttrValue, aRichGroup);
        else
          ret.addForeignAttribute (sAttrName, sAttrValue);
    });
    ret.setRich (aRichGroup);

    eDiagnostic.forAllChildren (aDiagnosticChild -> {
      switch (aDiagnosticChild.getType ())
      {
        case TEXT:
          ret.addText (((IMicroText) aDiagnosticChild).getNodeValue ());
          break;
        case ELEMENT:
          final IMicroElement eElement = (IMicroElement) aDiagnosticChild;
          if (isValidSchematronNS (eElement.getNamespaceURI ()))
          {
            final String sLocalName = eElement.getLocalName ();
            if (sLocalName.equals (CSchematronXML.ELEMENT_VALUE_OF))
              ret.addValueOf (readValueOfFromXML (eElement));
            else
              if (sLocalName.equals (CSchematronXML.ELEMENT_EMPH))
                ret.addEmph (readEmphFromXML (eElement));
              else
                if (sLocalName.equals (CSchematronXML.ELEMENT_DIR))
                  ret.addDir (readDirFromXML (eElement));
                else
                  if (sLocalName.equals (CSchematronXML.ELEMENT_SPAN))
                    ret.addSpan (readSpanFromXML (eElement));
                  else
                    _warn (ret, "Unsupported Schematron element '" + sLocalName + "'");
          }
          else
            ret.addForeignElement (eElement.getClone ());

          break;
        case COMMENT:
          // Ignore comments
          break;
        default:
          _warn (ret, "Unsupported child node: " + aDiagnosticChild);
      }
    });
    return ret;
  }

  /**
   * Read a <diagnostics> element
   *
   * @param eDiagnostics
   *        The source micro element. Never null.
   * @return The created domain object. May not be null.
   */
  @Nonnull
  public PSDiagnostics readDiagnosticsFromXML (@Nonnull final IMicroElement eDiagnostics)
  {
    final PSDiagnostics ret = new PSDiagnostics ();

    eDiagnostics.forAllAttributes ( (sNS, sAttrName, sVal) -> {
      final String sAttrValue = _getAttributeValue (sVal);
      ret.addForeignAttribute (sAttrName, sAttrValue);
    });

    eDiagnostics.forAllChildElements (eDiagnosticsChild -> {
      if (isValidSchematronNS (eDiagnosticsChild.getNamespaceURI ()))
      {
        if (eDiagnosticsChild.getLocalName ().equals (CSchematronXML.ELEMENT_INCLUDE))
          ret.addInclude (readIncludeFromXML (eDiagnosticsChild));
        else
          if (eDiagnosticsChild.getLocalName ().equals (CSchematronXML.ELEMENT_DIAGNOSTIC))
            ret.addDiagnostic (readDiagnosticFromXML (eDiagnosticsChild));
          else
            _warn (ret, "Unsupported Schematron element '" + eDiagnosticsChild.getLocalName () + "'");
      }
      else
        ret.addForeignElement (eDiagnosticsChild.getClone ());
    });
    return ret;
  }

  /**
   * Read a <dir> element
   *
   * @param eDir
   *        The source micro element. Never null.
   * @return The created domain object. May not be null.
   */
  @Nonnull
  public PSDir readDirFromXML (@Nonnull final IMicroElement eDir)
  {
    final PSDir ret = new PSDir ();

    eDir.forAllAttributes ( (sNS, sAttrName, sVal) -> {
      final String sAttrValue = _getAttributeValue (sVal);
      if (sAttrName.equals (CSchematronXML.ATTR_VALUE))
        ret.setValue (EDirValue.getFromIDOrNull (sAttrValue));
      else
        ret.addForeignAttribute (sAttrName, sAttrValue);
    });

    eDir.forAllChildren (aDirChild -> {
      switch (aDirChild.getType ())
      {
        case TEXT:
          ret.addText (((IMicroText) aDirChild).getNodeValue ());
          break;
        case ELEMENT:
          final IMicroElement eElement = (IMicroElement) aDirChild;
          if (isValidSchematronNS (eElement.getNamespaceURI ()))
          {
            _warn (ret, "Unsupported Schematron element '" + eElement.getLocalName () + "'");
          }
          else
            ret.addForeignElement (eElement.getClone ());

          break;
        case COMMENT:
          // Ignore comments
          break;
        default:
          _warn (ret, "Unsupported child node: " + aDirChild);
      }
    });
    return ret;
  }

  /**
   * Read an <emph> element
   *
   * @param eEmph
   *        The source micro element. Never null.
   * @return The created domain object. May not be null.
   */
  @Nonnull
  public PSEmph readEmphFromXML (@Nonnull final IMicroElement eEmph)
  {
    final PSEmph ret = new PSEmph ();

    eEmph.forAllAttributes ( (sNS, sAttrName, sVal) -> {
      final String sAttrValue = _getAttributeValue (sVal);
      _warn (ret, "Unsupported attribute '" + sAttrName + "'='" + sAttrValue + "'");
    });

    eEmph.forAllChildren (aEmphChild -> {
      switch (aEmphChild.getType ())
      {
        case TEXT:
          ret.addText (((IMicroText) aEmphChild).getNodeValue ());
          break;
        case ELEMENT:
          final IMicroElement eElement = (IMicroElement) aEmphChild;
          if (isValidSchematronNS (eElement.getNamespaceURI ()))
          {
            _warn (ret, "Unsupported Schematron element '" + eElement.getLocalName () + "'");
          }
          else
            _warn (ret, "Unsupported namespace URI '" + eElement.getNamespaceURI () + "'");

          break;
        case COMMENT:
          // Ignore comments
          break;
        default:
          _warn (ret, "Unsupported child node: " + aEmphChild);
      }
    });
    return ret;
  }

  /**
   * Read an <extends> element
   *
   * @param eExtends
   *        The source micro element. Never null.
   * @return The created domain object. May not be null.
   */
  @Nonnull
  public PSExtends readExtendsFromXML (@Nonnull final IMicroElement eExtends)
  {
    final PSExtends ret = new PSExtends ();

    eExtends.forAllAttributes ( (sNS, sAttrName, sVal) -> {
      final String sAttrValue = _getAttributeValue (sVal);
      if (sAttrName.equals (CSchematronXML.ATTR_RULE))
        ret.setRule (sAttrValue);
      else
        ret.addForeignAttribute (sAttrName, sAttrValue);
    });

    eExtends.forAllChildElements (eChild -> {
      if (isValidSchematronNS (eChild.getNamespaceURI ()))
      {
        _warn (ret, "Unsupported Schematron element '" + eChild.getLocalName () + "'");
      }
      else
        _warn (ret, "Unsupported namespace URI '" + eChild.getNamespaceURI () + "'");
    });
    return ret;
  }

  /**
   * Read an <include> element
   *
   * @param eInclude
   *        The source micro element. Never null.
   * @return The created domain object. May not be null.
   */
  @Nonnull
  public PSInclude readIncludeFromXML (@Nonnull final IMicroElement eInclude)
  {
    final PSInclude ret = new PSInclude ();

    eInclude.forAllAttributes ( (sNS, sAttrName, sVal) -> {
      final String sAttrValue = _getAttributeValue (sVal);
      if (sAttrName.equals (CSchematronXML.ATTR_HREF))
        ret.setHref (sAttrValue);
      else
        _warn (ret, "Unsupported attribute '" + sAttrName + "'='" + sAttrValue + "'");
    });

    eInclude.forAllChildElements (eValueOfChild -> {
      if (isValidSchematronNS (eValueOfChild.getNamespaceURI ()))
      {
        _warn (ret, "Unsupported Schematron element '" + eValueOfChild.getLocalName () + "'");
      }
      else
        _warn (ret, "Unsupported namespace URI '" + eValueOfChild.getNamespaceURI () + "'");
    });
    return ret;
  }

  /**
   * Read a <let> element
   *
   * @param eLet
   *        The source micro element. Never null.
   * @return The created domain object. May not be null.
   */
  @Nonnull
  public PSLet readLetFromXML (@Nonnull final IMicroElement eLet)
  {
    final PSLet ret = new PSLet ();

    eLet.forAllAttributes ( (sNS, sAttrName, sVal) -> {
      final String sAttrValue = _getAttributeValue (sVal);
      if (sAttrName.equals (CSchematronXML.ATTR_NAME))
        ret.setName (sAttrValue);
      else
        if (sAttrName.equals (CSchematronXML.ATTR_VALUE))
          ret.setValue (sAttrValue);
        else
          _warn (ret, "Unsupported attribute '" + sAttrName + "'='" + sAttrValue + "'");
    });

    eLet.forAllChildElements (eLetChild -> {
      if (isValidSchematronNS (eLetChild.getNamespaceURI ()))
      {
        _warn (ret, "Unsupported Schematron element '" + eLetChild.getLocalName () + "'");
      }
      else
        _warn (ret, "Unsupported namespace URI '" + eLetChild.getNamespaceURI () + "'");
    });
    return ret;
  }

  /**
   * Read a <name> element
   *
   * @param eName
   *        The source micro element. Never null.
   * @return The created domain object. May not be null.
   */
  @Nonnull
  public PSName readNameFromXML (@Nonnull final IMicroElement eName)
  {
    final PSName ret = new PSName ();

    eName.forAllAttributes ( (sNS, sAttrName, sVal) -> {
      final String sAttrValue = _getAttributeValue (sVal);
      if (sAttrName.equals (CSchematronXML.ATTR_PATH))
        ret.setPath (sAttrValue);
      else
        ret.addForeignAttribute (sAttrName, sAttrValue);
    });

    eName.forAllChildElements (eNameChild -> {
      if (isValidSchematronNS (eNameChild.getNamespaceURI ()))
      {
        _warn (ret, "Unsupported Schematron element '" + eNameChild.getLocalName () + "'");
      }
      else
        _warn (ret, "Unsupported namespace URI '" + eNameChild.getNamespaceURI () + "'");
    });
    return ret;
  }

  /**
   * Read a <ns> element
   *
   * @param eNS
   *        The source micro element. Never null.
   * @return The created domain object. May not be null.
   */
  @Nonnull
  public PSNS readNSFromXML (@Nonnull final IMicroElement eNS)
  {
    final PSNS ret = new PSNS ();

    eNS.forAllAttributes ( (sNS, sAttrName, sVal) -> {
      final String sAttrValue = _getAttributeValue (sVal);
      if (sAttrName.equals (CSchematronXML.ATTR_URI))
        ret.setUri (sAttrValue);
      else
        if (sAttrName.equals (CSchematronXML.ATTR_PREFIX))
          ret.setPrefix (sAttrValue);
        else
          ret.addForeignAttribute (sAttrName, sAttrValue);
    });

    eNS.forAllChildElements (eLetChild -> {
      if (isValidSchematronNS (eLetChild.getNamespaceURI ()))
      {
        _warn (ret, "Unsupported Schematron element '" + eLetChild.getLocalName () + "'");
      }
      else
        _warn (ret, "Unsupported namespace URI '" + eLetChild.getNamespaceURI () + "'");
    });
    return ret;
  }

  /**
   * Read a <p> element
   *
   * @param eP
   *        The source micro element. Never null.
   * @return The created domain object. May not be null.
   */
  @Nonnull
  public PSP readPFromXML (@Nonnull final IMicroElement eP)
  {
    final PSP ret = new PSP ();
    eP.forAllAttributes ( (sNS, sAttrName, sVal) -> {
      final String sAttrValue = _getAttributeValue (sVal);
      if (sAttrName.equals (CSchematronXML.ATTR_ID))
        ret.setID (sAttrValue);
      else
        if (sAttrName.equals (CSchematronXML.ATTR_CLASS))
          ret.setClazz (sAttrValue);
        else
          if (sAttrName.equals (CSchematronXML.ATTR_ICON))
            ret.setIcon (sAttrValue);
          else
            ret.addForeignAttribute (sAttrName, sAttrValue);
    });

    eP.forAllChildren (aChild -> {
      switch (aChild.getType ())
      {
        case TEXT:
          ret.addText (((IMicroText) aChild).getNodeValue ());
          break;
        case ELEMENT:
          final IMicroElement eElement = (IMicroElement) aChild;
          if (isValidSchematronNS (eElement.getNamespaceURI ()))
          {
            final String sLocalName = eElement.getLocalName ();
            if (sLocalName.equals (CSchematronXML.ELEMENT_DIR))
              ret.addDir (readDirFromXML (eElement));
            else
              if (sLocalName.equals (CSchematronXML.ELEMENT_EMPH))
                ret.addEmph (readEmphFromXML (eElement));
              else
                if (sLocalName.equals (CSchematronXML.ELEMENT_SPAN))
                  ret.addSpan (readSpanFromXML (eElement));
                else
                  _warn (ret, "Unsupported Schematron element '" + sLocalName + "'");
          }
          else
            ret.addForeignElement (eElement.getClone ());

          break;
        case COMMENT:
          // Ignore comments
          break;
        default:
          _warn (ret, "Unsupported child node: " + aChild);
      }
    });
    return ret;
  }

  /**
   * Read a <param> element
   *
   * @param eParam
   *        The source micro element. Never null.
   * @return The created domain object. May not be null.
   */
  @Nonnull
  public PSParam readParamFromXML (@Nonnull final IMicroElement eParam)
  {
    final PSParam ret = new PSParam ();

    eParam.forAllAttributes ( (sNS, sAttrName, sVal) -> {
      final String sAttrValue = _getAttributeValue (sVal);
      if (sAttrName.equals (CSchematronXML.ATTR_NAME))
        ret.setName (sAttrValue);
      else
        if (sAttrName.equals (CSchematronXML.ATTR_VALUE))
          ret.setValue (sAttrValue);
        else
          _warn (ret, "Unsupported attribute '" + sAttrName + "'='" + sAttrValue + "'");
    });

    eParam.forAllChildElements (eParamChild -> {
      if (isValidSchematronNS (eParamChild.getNamespaceURI ()))
      {
        _warn (ret, "Unsupported Schematron element '" + eParamChild.getLocalName () + "'");
      }
      else
        _warn (ret, "Unsupported namespace URI '" + eParamChild.getNamespaceURI () + "'");
    });
    return ret;
  }

  /**
   * Read a <pattern> element
   *
   * @param ePattern
   *        The source micro element. Never null.
   * @return The created domain object. May not be null.
   */
  @Nonnull
  public PSPattern readPatternFromXML (@Nonnull final IMicroElement ePattern)
  {
    final PSPattern ret = new PSPattern ();

    final PSRichGroup aRichGroup = new PSRichGroup ();
    ePattern.forAllAttributes ( (sNS, sAttrName, sVal) -> {
      final String sAttrValue = _getAttributeValue (sVal);
      if (sAttrName.equals (CSchematronXML.ATTR_ABSTRACT))
        ret.setAbstract (StringParser.parseBool (sAttrValue));
      else
        if (sAttrName.equals (CSchematronXML.ATTR_ID))
          ret.setID (sAttrValue);
        else
          if (sAttrName.equals (CSchematronXML.ATTR_IS_A))
            ret.setIsA (sAttrValue);
          else
            if (PSRichGroup.isRichAttribute (sAttrName))
              _handleRichGroup (sAttrName, sAttrValue, aRichGroup);
            else
              ret.addForeignAttribute (sAttrName, sAttrValue);
    });
    ret.setRich (aRichGroup);

    ePattern.forAllChildElements (ePatternChild -> {
      if (isValidSchematronNS (ePatternChild.getNamespaceURI ()))
      {
        if (ePatternChild.getLocalName ().equals (CSchematronXML.ELEMENT_INCLUDE))
          ret.addInclude (readIncludeFromXML (ePatternChild));
        else
          if (ePatternChild.getLocalName ().equals (CSchematronXML.ELEMENT_TITLE))
            ret.setTitle (readTitleFromXML (ePatternChild));
          else
            if (ePatternChild.getLocalName ().equals (CSchematronXML.ELEMENT_P))
              ret.addP (readPFromXML (ePatternChild));
            else
              if (ePatternChild.getLocalName ().equals (CSchematronXML.ELEMENT_LET))
                ret.addLet (readLetFromXML (ePatternChild));
              else
                if (ePatternChild.getLocalName ().equals (CSchematronXML.ELEMENT_RULE))
                  ret.addRule (readRuleFromXML (ePatternChild));
                else
                  if (ePatternChild.getLocalName ().equals (CSchematronXML.ELEMENT_PARAM))
                    ret.addParam (readParamFromXML (ePatternChild));
                  else
                    _warn (ret, "Unsupported Schematron element '" + ePatternChild.getLocalName () + "' in " + ret.toString ());
      }
      else
        ret.addForeignElement (ePatternChild.getClone ());
    });
    return ret;
  }

  /**
   * Read a <phase> element
   *
   * @param ePhase
   *        The source micro element. Never null.
   * @return The created domain object. May not be null.
   */
  @Nonnull
  public PSPhase readPhaseFromXML (@Nonnull final IMicroElement ePhase)
  {
    final PSPhase ret = new PSPhase ();

    final PSRichGroup aRichGroup = new PSRichGroup ();
    ePhase.forAllAttributes ( (sNS, sAttrName, sVal) -> {
      final String sAttrValue = _getAttributeValue (sVal);
      if (sAttrName.equals (CSchematronXML.ATTR_ID))
        ret.setID (sAttrValue);
      else
        if (PSRichGroup.isRichAttribute (sAttrName))
          _handleRichGroup (sAttrName, sAttrValue, aRichGroup);
        else
          ret.addForeignAttribute (sAttrName, sAttrValue);
    });
    ret.setRich (aRichGroup);

    ePhase.forAllChildElements (ePhaseChild -> {
      if (isValidSchematronNS (ePhaseChild.getNamespaceURI ()))
      {
        if (ePhaseChild.getLocalName ().equals (CSchematronXML.ELEMENT_INCLUDE))
          ret.addInclude (readIncludeFromXML (ePhaseChild));
        else
          if (ePhaseChild.getLocalName ().equals (CSchematronXML.ELEMENT_P))
            ret.addP (readPFromXML (ePhaseChild));
          else
            if (ePhaseChild.getLocalName ().equals (CSchematronXML.ELEMENT_LET))
              ret.addLet (readLetFromXML (ePhaseChild));
            else
              if (ePhaseChild.getLocalName ().equals (CSchematronXML.ELEMENT_ACTIVE))
                ret.addActive (readActiveFromXML (ePhaseChild));
              else
                _warn (ret, "Unsupported Schematron element '" + ePhaseChild.getLocalName () + "'");
      }
      else
        ret.addForeignElement (ePhaseChild.getClone ());
    });
    return ret;
  }

  /**
   * Read a <rule> element
   *
   * @param eRule
   *        The source micro element. Never null.
   * @return The created domain object. May not be null.
   */
  @Nonnull
  public PSRule readRuleFromXML (@Nonnull final IMicroElement eRule)
  {
    final PSRule ret = new PSRule ();

    final PSRichGroup aRichGroup = new PSRichGroup ();
    final PSLinkableGroup aLinkableGroup = new PSLinkableGroup ();
    eRule.forAllAttributes ( (sNS, sAttrName, sVal) -> {
      final String sAttrValue = _getAttributeValue (sVal);
      if (sAttrName.equals (CSchematronXML.ATTR_FLAG))
        ret.setFlag (sAttrValue);
      else
        if (sAttrName.equals (CSchematronXML.ATTR_ABSTRACT))
          ret.setAbstract (StringParser.parseBool (sAttrValue));
        else
          if (sAttrName.equals (CSchematronXML.ATTR_CONTEXT))
            ret.setContext (sAttrValue);
          else
            if (sAttrName.equals (CSchematronXML.ATTR_ID))
              ret.setID (sAttrValue);
            else
              if (PSRichGroup.isRichAttribute (sAttrName))
                _handleRichGroup (sAttrName, sAttrValue, aRichGroup);
              else
                if (PSLinkableGroup.isLinkableAttribute (sAttrName))
                  _handleLinkableGroup (sAttrName, sAttrValue, aLinkableGroup);
                else
                  ret.addForeignAttribute (sAttrName, sAttrValue);
    });
    ret.setRich (aRichGroup);
    ret.setLinkable (aLinkableGroup);

    eRule.forAllChildElements (eRuleChild -> {
      if (isValidSchematronNS (eRuleChild.getNamespaceURI ()))
      {
        final String sLocalName = eRuleChild.getLocalName ();
        if (sLocalName.equals (CSchematronXML.ELEMENT_INCLUDE))
          ret.addInclude (readIncludeFromXML (eRuleChild));
        else
          if (sLocalName.equals (CSchematronXML.ELEMENT_LET))
            ret.addLet (readLetFromXML (eRuleChild));
          else
            if (sLocalName.equals (CSchematronXML.ELEMENT_ASSERT) || sLocalName.equals (CSchematronXML.ELEMENT_REPORT))
              ret.addAssertReport (readAssertReportFromXML (eRuleChild));
            else
              if (sLocalName.equals (CSchematronXML.ELEMENT_EXTENDS))
                ret.addExtends (readExtendsFromXML (eRuleChild));
              else
                _warn (ret, "Unsupported Schematron element '" + sLocalName + "'");
      }
      else
        ret.addForeignElement (eRuleChild.getClone ());
    });
    return ret;
  }

  public boolean isValidSchematronNS (@Nullable final String sNamespaceURI)
  {
    return SchematronHelper.isValidSchematronNS (sNamespaceURI, isLenient ());
  }

  /**
   * Parse the Schematron into a pure Java object. This method makes no
   * assumptions on the validity of the document!
   *
   * @param eSchema
   *        The XML element to use. May not be null.
   * @return The created {@link PSSchema} object or null in case of
   *         null document or a fatal error.
   * @throws SchematronReadException
   *         If reading fails
   */
  @Nonnull
  public PSSchema readSchemaFromXML (@Nonnull final IMicroElement eSchema) throws SchematronReadException
  {
    ValueEnforcer.notNull (eSchema, "Schema");

    if (!isLenient () && SchematronHelper.isDeprecatedSchematronNS (eSchema.getNamespaceURI ()))
      LOGGER.warn ("OLD Schematron NS '" +
                   eSchema.getNamespaceURI () +
                   "' is deprecated, use '" +
                   CSchematron.NAMESPACE_SCHEMATRON +
                   "' instead");

    if (!isValidSchematronNS (eSchema.getNamespaceURI ()))
      throw new SchematronReadException (m_aResource, "The passed element is not an ISO Schematron element!");

    final PSSchema ret = new PSSchema (m_aResource);
    final PSRichGroup aRichGroup = new PSRichGroup ();
    eSchema.forAllAttributes ( (sNS, sAttrName, sVal) -> {
      final String sAttrValue = _getAttributeValue (sVal);
      if (sAttrName.equals (CSchematronXML.ATTR_ID))
        ret.setID (sAttrValue);
      else
        if (sAttrName.equals (CSchematronXML.ATTR_SCHEMA_VERSION))
          ret.setSchemaVersion (sAttrValue);
        else
          if (sAttrName.equals (CSchematronXML.ATTR_DEFAULT_PHASE))
            ret.setDefaultPhase (sAttrValue);
          else
            if (sAttrName.equals (CSchematronXML.ATTR_QUERY_BINDING))
              ret.setQueryBinding (sAttrValue);
            else
              if (PSRichGroup.isRichAttribute (sAttrName))
                _handleRichGroup (sAttrName, sAttrValue, aRichGroup);
              else
                ret.addForeignAttribute (sAttrName, sAttrValue);
    });
    ret.setRich (aRichGroup);

    eSchema.forAllChildElements (eSchemaChild -> {
      if (isValidSchematronNS (eSchemaChild.getNamespaceURI ()))
      {
        if (eSchemaChild.getLocalName ().equals (CSchematronXML.ELEMENT_INCLUDE))
          ret.addInclude (readIncludeFromXML (eSchemaChild));
        else
          if (eSchemaChild.getLocalName ().equals (CSchematronXML.ELEMENT_TITLE))
            ret.setTitle (readTitleFromXML (eSchemaChild));
          else
            if (eSchemaChild.getLocalName ().equals (CSchematronXML.ELEMENT_NS))
              ret.addNS (readNSFromXML (eSchemaChild));
            else
              if (eSchemaChild.getLocalName ().equals (CSchematronXML.ELEMENT_P))
              {
                final PSP aP = readPFromXML (eSchemaChild);
                if (ret.hasNoPatterns ())
                  ret.addStartP (aP);
                else
                  ret.addEndP (aP);
              }
              else
                if (eSchemaChild.getLocalName ().equals (CSchematronXML.ELEMENT_LET))
                  ret.addLet (readLetFromXML (eSchemaChild));
                else
                  if (eSchemaChild.getLocalName ().equals (CSchematronXML.ELEMENT_PHASE))
                    ret.addPhase (readPhaseFromXML (eSchemaChild));
                  else
                    if (eSchemaChild.getLocalName ().equals (CSchematronXML.ELEMENT_PATTERN))
                      ret.addPattern (readPatternFromXML (eSchemaChild));
                    else
                      if (eSchemaChild.getLocalName ().equals (CSchematronXML.ELEMENT_DIAGNOSTICS))
                        ret.setDiagnostics (readDiagnosticsFromXML (eSchemaChild));
                      else
                        _warn (ret, "Unsupported Schematron element '" + eSchemaChild.getLocalName () + "'");
      }
      else
        ret.addForeignElement (eSchemaChild.getClone ());
    });
    return ret;
  }

  /**
   * Read a <span> element
   *
   * @param eSpan
   *        The source micro element. Never null.
   * @return The created domain object. May not be null.
   */
  @Nonnull
  public PSSpan readSpanFromXML (@Nonnull final IMicroElement eSpan)
  {
    final PSSpan ret = new PSSpan ();

    eSpan.forAllAttributes ( (sNS, sAttrName, sVal) -> {
      final String sAttrValue = _getAttributeValue (sVal);
      if (sAttrName.equals (CSchematronXML.ATTR_CLASS))
        ret.setClazz (sAttrValue);
      else
        ret.addForeignAttribute (sAttrName, sAttrValue);
    });

    eSpan.forAllChildren (aSpanChild -> {
      switch (aSpanChild.getType ())
      {
        case TEXT:
          ret.addText (((IMicroText) aSpanChild).getNodeValue ());
          break;
        case ELEMENT:
          final IMicroElement eElement = (IMicroElement) aSpanChild;
          if (isValidSchematronNS (eElement.getNamespaceURI ()))
          {
            _warn (ret, "Unsupported Schematron element '" + eElement.getLocalName () + "'");
          }
          else
            ret.addForeignElement (eElement.getClone ());

          break;
        case COMMENT:
          // Ignore comments
          break;
        default:
          _warn (ret, "Unsupported child node: " + aSpanChild);
      }
    });
    return ret;
  }

  /**
   * Read a <title> element
   *
   * @param eTitle
   *        The source micro element. Never null.
   * @return The created domain object. May not be null.
   */
  @Nonnull
  public PSTitle readTitleFromXML (@Nonnull final IMicroElement eTitle)
  {
    final PSTitle ret = new PSTitle ();

    eTitle.forAllAttributes ( (sNS, sAttrName, sVal) -> {
      final String sAttrValue = _getAttributeValue (sVal);
      _warn (ret, "Unsupported attribute '" + sAttrName + "'='" + sAttrValue + "'");
    });

    eTitle.forAllChildren (aTitleChild -> {
      switch (aTitleChild.getType ())
      {
        case TEXT:
          ret.addText (((IMicroText) aTitleChild).getNodeValue ());
          break;
        case ELEMENT:
          final IMicroElement eElement = (IMicroElement) aTitleChild;
          if (isValidSchematronNS (eElement.getNamespaceURI ()))
          {
            final String sLocalName = eElement.getLocalName ();
            if (sLocalName.equals (CSchematronXML.ELEMENT_DIR))
              ret.addDir (readDirFromXML (eElement));
            else
              _warn (ret, "Unsupported Schematron element '" + sLocalName + "'");
          }
          else
            _warn (ret, "Unsupported namespace URI '" + eElement.getNamespaceURI () + "'");

          break;
        case COMMENT:
          // Ignore comments
          break;
        default:
          _warn (ret, "Unsupported child node: " + aTitleChild);
      }
    });
    return ret;
  }

  /**
   * Read a <value-of> element
   *
   * @param eValueOf
   *        The source micro element. Never null.
   * @return The created domain object. May not be null.
   */
  @Nonnull
  public PSValueOf readValueOfFromXML (@Nonnull final IMicroElement eValueOf)
  {
    final PSValueOf ret = new PSValueOf ();

    eValueOf.forAllAttributes ( (sNS, sAttrName, sVal) -> {
      final String sAttrValue = _getAttributeValue (sVal);
      if (sAttrName.equals (CSchematronXML.ATTR_SELECT))
        ret.setSelect (sAttrValue);
      else
        ret.addForeignAttribute (sAttrName, sAttrValue);
    });

    eValueOf.forAllChildElements (eValueOfChild -> {
      if (isValidSchematronNS (eValueOfChild.getNamespaceURI ()))
      {
        _warn (ret, "Unsupported Schematron element '" + eValueOfChild.getLocalName () + "'");
      }
      else
        _warn (ret, "Unsupported namespace URI '" + eValueOfChild.getNamespaceURI () + "'");
    });
    return ret;
  }

  /**
   * Read the schema from the resource supplied in the constructor. First all
   * includes are resolved and than {@link #readSchemaFromXML(IMicroElement)} is
   * called.
   *
   * @return The read {@link PSSchema}.
   * @throws SchematronReadException
   *         If reading fails
   */
  @Nonnull
  public PSSchema readSchema () throws SchematronReadException
  {
    // Resolve all includes as the first action
    final SAXReaderSettings aSettings = new SAXReaderSettings ().setEntityResolver (m_aEntityResolver);

    final IMicroDocument aDoc = SchematronHelper.getWithResolvedSchematronIncludes (m_aResource, aSettings, m_aErrorHandler, m_bLenient);
    if (aDoc == null || aDoc.getDocumentElement () == null)
      throw new SchematronReadException (m_aResource, "Failed to resolve includes in Schematron resource " + m_aResource);

    if (SchematronDebug.isShowResolvedSourceSchematron ())
      LOGGER.info ("Resolved source Schematron:\n" + MicroWriter.getNodeAsString (aDoc));

    return readSchemaFromXML (aDoc.getDocumentElement ());
  }

  @Override
  public String toString ()
  {
    return new ToStringGenerator (this).append ("resource", m_aResource).append ("errorHandler", m_aErrorHandler).getToString ();
  }
}




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