/**
    * Copyright (C) 2014-2016 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.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.collection.ext.CommonsLinkedHashMap;
  import com.helger.commons.collection.ext.ICommonsOrderedMap;
  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;
  import com.helger.xml.microdom.IMicroElement;
  import com.helger.xml.microdom.MicroElement;
  
  /**
   * A single Schematron ns-element.<br>
   * Specification of a namespace prefix and URI. The required prefix attribute is
   * an XML name with no colon character. The required uri attribute is a
   * namespace URI.<br>
   * NOTE: Because the characters allowed as names may change in versions of XML
   * subsequent to W3C XML 1.0, the ISO/IEC 19757-2 (RELAX NG Compact Syntax)
   * schema for Schematron does not constrain the prefix to particular characters.
   * <br>
   * In an ISO Schematron schema, namespace prefixes in context expressions,
   * assertion tests and other query expressions should use the namespace bindings
   * provided by this element. Namespace prefixes should not use the namespace
   * bindings in scope for element and attribute names.
   *
   * @author Philip Helger
   */
  @NotThreadSafe
  public class PSNS implements IPSClonableElement <PSNS>, IPSHasForeignAttributes
  {
    private String m_sUri;
    private String m_sPrefix;
    private ICommonsOrderedMap <String, String> m_aForeignAttrs;
  
    public PSNS ()
    {}
  
    public boolean isValid (@Nonnull final IPSErrorHandler aErrorHandler)
    {
      if (StringHelper.hasNoText (m_sUri))
      {
        aErrorHandler.error (this, "<ns> has no 'uri'");
        return false;
      }
      if (StringHelper.hasNoText (m_sPrefix))
      {
        aErrorHandler.error (this, "<ns> has no 'prefix'");
        return false;
      }
      return true;
    }
  
    public void validateCompletely (@Nonnull final IPSErrorHandler aErrorHandler)
    {
      if (StringHelper.hasNoText (m_sUri))
        aErrorHandler.error (this, "<ns> has no 'uri'");
      if (StringHelper.hasNoText (m_sPrefix))
        aErrorHandler.error (this, "<ns> has no 'prefix'");
    }
  
    public boolean isMinimal ()
    {
      return true;
    }
  
    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 CommonsLinkedHashMap <> ();
      m_aForeignAttrs.put (sAttrName, sAttrValue);
    }
 
   public boolean hasForeignAttributes ()
   {
     return m_aForeignAttrs != null && m_aForeignAttrs.isNotEmpty ();
   }
 
   @Nonnull
   @ReturnsMutableCopy
   public ICommonsOrderedMap <String, String> getAllForeignAttributes ()
   {
     return new CommonsLinkedHashMap <> (m_aForeignAttrs);
   }
 
   /**
    * @param sUri
    *        The namespace URI.
    */
   public void setUri (@Nullable final String sUri)
   {
     m_sUri = sUri;
   }
 
   /**
    * @return The namespace URI. May be <code>null</code>.
    */
   @Nullable
   public String getUri ()
   {
     return m_sUri;
   }
 
   /**
    * @param sPrefix
    *        The namespace prefix to use.
    */
   public void setPrefix (@Nullable final String sPrefix)
   {
     m_sPrefix = sPrefix;
   }
 
   /**
    * @return The namespace prefix. May be <code>null</code>.
    */
   @Nullable
   public String getPrefix ()
   {
     return m_sPrefix;
   }
 
   @Nonnull
   public IMicroElement getAsMicroElement ()
   {
     final IMicroElement ret = new MicroElement (CSchematron.NAMESPACE_SCHEMATRON, CSchematronXML.ELEMENT_NS);
     ret.setAttribute (CSchematronXML.ATTR_PREFIX, m_sPrefix);
     ret.setAttribute (CSchematronXML.ATTR_URI, m_sUri);
     if (m_aForeignAttrs != null)
       for (final Map.Entry <String, String> aEntry : m_aForeignAttrs.entrySet ())
         ret.setAttribute (aEntry.getKey (), aEntry.getValue ());
     return ret;
   }
 
   @Nonnull
   public PSNS getClone ()
   {
     final PSNS ret = new PSNS ();
     ret.setUri (m_sUri);
     ret.setPrefix (m_sPrefix);
     if (hasForeignAttributes ())
       ret.addForeignAttributes (m_aForeignAttrs);
     return ret;
   }
 
   @Override
   public String toString ()
   {
     return new ToStringGenerator (this).appendIfNotNull ("uri", m_sUri)
                                        .appendIfNotNull ("prefix", m_sPrefix)
                                        .appendIf ("foreignAttrs", m_aForeignAttrs, CollectionHelper::isNotEmpty)
                                        .toString ();
   }
 }