/**
    * Copyright (C) 2014-2015 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.svrl;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.concurrent.locks.ReadWriteLock;
  import java.util.concurrent.locks.ReentrantReadWriteLock;
  
  import javax.annotation.Nonnull;
  import javax.annotation.concurrent.ThreadSafe;
  
  import org.oclc.purl.dsdl.svrl.FailedAssert;
  import org.oclc.purl.dsdl.svrl.SchematronOutputType;
  import org.oclc.purl.dsdl.svrl.SuccessfulReport;
  
  import com.helger.commons.ValueEnforcer;
  import com.helger.commons.annotation.PresentForCodeCoverage;
  import com.helger.commons.annotation.ReturnsMutableCopy;
  import com.helger.commons.error.IErrorLevel;
  
  /**
   * Miscellaneous utility methods for handling Schematron output (SVRL).
   *
   * @author Philip Helger
   */
  @ThreadSafe
  public final class SVRLHelper
  {
    private static final ReadWriteLock s_aRWLock = new ReentrantReadWriteLock ();
  
    private static ISVRLErrorLevelDeterminator s_aELD = new DefaultSVRLErrorLevelDeterminator ();
  
    @PresentForCodeCoverage
    private static final SVRLHelper s_aInstance = new SVRLHelper ();
  
    private SVRLHelper ()
    {}
  
    /**
     * Get a list of all failed assertions in a given schematron output.
     *
     * @param aSchematronOutput
     *        The schematron output to be used. May not be <code>null</code>.
     * @return A non-<code>null</code> list with all failed assertions.
     */
    @Nonnull
    @ReturnsMutableCopy
    public static List <SVRLFailedAssert> getAllFailedAssertions (@Nonnull final SchematronOutputType aSchematronOutput)
    {
      final List <SVRLFailedAssert> ret = new ArrayList <SVRLFailedAssert> ();
      for (final Object aObj : aSchematronOutput.getActivePatternAndFiredRuleAndFailedAssert ())
        if (aObj instanceof FailedAssert)
          ret.add (new SVRLFailedAssert ((FailedAssert) aObj));
      return ret;
    }
  
    /**
     * Get a list of all failed assertions in a given schematron output, with an
     * error level equally or more severe than the passed error level.
     *
     * @param aSchematronOutput
     *        The schematron output to be used. May not be <code>null</code>.
     * @param aErrorLevel
     *        Minimum error level to be queried
     * @return A non-<code>null</code> list with all failed assertions.
     */
    @Nonnull
    @ReturnsMutableCopy
    public static List <SVRLFailedAssert> getAllFailedAssertionsMoreOrEqualSevereThan (@Nonnull final SchematronOutputType aSchematronOutput,
                                                                                       @Nonnull final IErrorLevel aErrorLevel)
    {
      final List <SVRLFailedAssert> ret = new ArrayList <SVRLFailedAssert> ();
      for (final Object aObj : aSchematronOutput.getActivePatternAndFiredRuleAndFailedAssert ())
        if (aObj instanceof FailedAssert)
        {
          final SVRLFailedAssert aFA = new SVRLFailedAssert ((FailedAssert) aObj);
          if (aFA.getFlag ().isMoreOrEqualSevereThan (aErrorLevel))
            ret.add (aFA);
        }
      return ret;
    }
  
    /**
     * Get a list of all successful reports in a given schematron output.
    *
    * @param aSchematronOutput
    *        The schematron output to be used. May not be <code>null</code>.
    * @return A non-<code>null</code> list with all successful reports.
    */
   @Nonnull
   @ReturnsMutableCopy
   public static List <SVRLSuccessfulReport> getAllSuccessfulReports (@Nonnull final SchematronOutputType aSchematronOutput)
   {
     final List <SVRLSuccessfulReport> ret = new ArrayList <SVRLSuccessfulReport> ();
     for (final Object aObj : aSchematronOutput.getActivePatternAndFiredRuleAndFailedAssert ())
       if (aObj instanceof SuccessfulReport)
         ret.add (new SVRLSuccessfulReport ((SuccessfulReport) aObj));
     return ret;
   }
 
   /**
    * Get a list of all successful reports in a given schematron output, with an
    * error level equally or more severe than the passed error level.
    *
    * @param aSchematronOutput
    *        The schematron output to be used. May not be <code>null</code>.
    * @param aErrorLevel
    *        Minimum error level to be queried
    * @return A non-<code>null</code> list with all successful reports.
    */
   @Nonnull
   @ReturnsMutableCopy
   public static List <SVRLSuccessfulReport> getAllSuccessfulReportsMoreOrEqualSevereThan (@Nonnull final SchematronOutputType aSchematronOutput,
                                                                                           @Nonnull final IErrorLevel aErrorLevel)
   {
     final List <SVRLSuccessfulReport> ret = new ArrayList <SVRLSuccessfulReport> ();
     for (final Object aObj : aSchematronOutput.getActivePatternAndFiredRuleAndFailedAssert ())
       if (aObj instanceof SuccessfulReport)
       {
         final SVRLSuccessfulReport aFA = new SVRLSuccessfulReport ((SuccessfulReport) aObj);
         if (aFA.getFlag ().isMoreOrEqualSevereThan (aErrorLevel))
           ret.add (aFA);
       }
     return ret;
   }
 
   /**
    * Get the error level associated with a single failed assertion.
    *
    * @param aFailedAssert
    *        The failed assert to be queried. May not be <code>null</code>.
    * @return The error level and never <code>null</code>.
    */
   @Nonnull
   public static IErrorLevel getErrorLevelFromFailedAssert (@Nonnull final FailedAssert aFailedAssert)
   {
     return getErrorLevelDeterminator ().getErrorLevelFromFailedAssert (aFailedAssert);
   }
 
   /**
    * Get the error level associated with a single successful report.
    *
    * @param aSuccessfulReport
    *        The failed assert to be queried. May not be <code>null</code>.
    * @return The error level and never <code>null</code>.
    */
   @Nonnull
   public static IErrorLevel getErrorLevelFromSuccessfulReport (@Nonnull final SuccessfulReport aSuccessfulReport)
   {
     return getErrorLevelDeterminator ().getErrorLevelFromSuccessfulReport (aSuccessfulReport);
   }
 
   @Nonnull
   public static ISVRLErrorLevelDeterminator getErrorLevelDeterminator ()
   {
     s_aRWLock.readLock ().lock ();
     try
     {
       return s_aELD;
     }
     finally
     {
       s_aRWLock.readLock ().unlock ();
     }
   }
 
   public static void setErrorLevelDeterminator (@Nonnull final ISVRLErrorLevelDeterminator aELD)
   {
     ValueEnforcer.notNull (aELD, "ErrorLevelDeterminator");
 
     s_aRWLock.readLock ().lock ();
     try
     {
       s_aELD = aELD;
     }
     finally
     {
       s_aRWLock.readLock ().unlock ();
     }
   }
 }