/**
    * 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.pure.model;
  
  import java.util.LinkedHashMap;
  import java.util.Map;
  
  import javax.annotation.Nonnull;
  import javax.annotation.Nullable;
  import javax.annotation.concurrent.NotThreadSafe;
  
  import com.helger.commons.ValueEnforcer;
  import com.helger.commons.annotation.ReturnsMutableCopy;
  import com.helger.commons.collection.CollectionHelper;
  import com.helger.commons.microdom.IMicroElement;
  import com.helger.commons.microdom.MicroElement;
  import com.helger.commons.string.StringHelper;
  import com.helger.commons.string.ToStringGenerator;
  import com.helger.schematron.CSchematron;
  import com.helger.schematron.CSchematronXML;
  import com.helger.schematron.pure.errorhandler.IPSErrorHandler;
  
  /**
   * A single Schematron extends-element.<br>
   * Abstract rules are named lists of assertions without a context expression.
   * The required rule attribute references an abstract rule. The current rule
   * uses all the assertions from the abstract rule it extends.
   *
   * @author Philip Helger
   */
  @NotThreadSafe
  public class PSExtends implements IPSElement, IPSHasForeignAttributes
  {
    private String m_sRule;
    private Map <String, String> m_aForeignAttrs;
  
    public PSExtends ()
    {}
  
    public boolean isValid (@Nonnull final IPSErrorHandler aErrorHandler)
    {
      if (StringHelper.hasNoText (m_sRule))
      {
        aErrorHandler.error (this, "<extends> has no 'rule'");
        return false;
      }
      return true;
    }
  
    public void validateCompletely (@Nonnull final IPSErrorHandler aErrorHandler)
    {
      if (StringHelper.hasNoText (m_sRule))
        aErrorHandler.error (this, "<extends> has no 'rule'");
    }
  
    public boolean isMinimal ()
    {
      return false;
    }
  
    public void addForeignAttribute (@Nonnull final String sAttrName, @Nonnull final String sAttrValue)
    {
      ValueEnforcer.notNull (sAttrName, "AttrName");
      ValueEnforcer.notNull (sAttrValue, "AttrValue");
      if (m_aForeignAttrs == null)
        m_aForeignAttrs = new LinkedHashMap <String, String> ();
      m_aForeignAttrs.put (sAttrName, sAttrValue);
    }
  
    public void addForeignAttributes (@Nonnull final Map <String, String> aForeignAttrs)
    {
      ValueEnforcer.notNull (aForeignAttrs, "ForeignAttrs");
      for (final Map.Entry <String, String> aEntry : aForeignAttrs.entrySet ())
        addForeignAttribute (aEntry.getKey (), aEntry.getValue ());
    }
  
    public boolean hasForeignAttributes ()
    {
      return m_aForeignAttrs != null && !m_aForeignAttrs.isEmpty ();
    }
  
    @Nonnull
    @ReturnsMutableCopy
    public Map <String, String> getAllForeignAttributes ()
    {
     return CollectionHelper.newOrderedMap (m_aForeignAttrs);
   }
 
   public void setRule (@Nullable final String sRule)
   {
     m_sRule = sRule;
   }
 
   /**
    * @return Reference to a {@link PSRule} element
    */
   @Nullable
   public String getRule ()
   {
     return m_sRule;
   }
 
   @Nonnull
   public IMicroElement getAsMicroElement ()
   {
     final IMicroElement ret = new MicroElement (CSchematron.NAMESPACE_SCHEMATRON, CSchematronXML.ELEMENT_EXTENDS);
     ret.setAttribute (CSchematronXML.ATTR_RULE, m_sRule);
     if (m_aForeignAttrs != null)
       for (final Map.Entry <String, String> aEntry : m_aForeignAttrs.entrySet ())
         ret.setAttribute (aEntry.getKey (), aEntry.getValue ());
     return ret;
   }
 
   @Override
   public String toString ()
   {
     return new ToStringGenerator (this).appendIfNotNull ("rule", m_sRule)
                                        .appendIfNotEmpty ("foreignAttrs", m_aForeignAttrs)
                                        .toString ();
   }
 }