/**
    * 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 javax.annotation.Nonnull;
  import javax.annotation.Nullable;
  import javax.annotation.concurrent.NotThreadSafe;
  
  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 param-element.<br>
   * A name-value pair providing parameters for an abstract pattern. The required
   * name attribute is an XML name with no colon. The required value attribute is
   * a fragment of a query.
   *
   * @author Philip Helger
   */
  @NotThreadSafe
  public class PSParam implements IPSElement
  {
    private String m_sName;
    private String m_sValue;
  
    public PSParam ()
    {}
  
    public boolean isValid (@Nonnull final IPSErrorHandler aErrorHandler)
    {
      if (StringHelper.hasNoText (m_sName))
      {
        aErrorHandler.error (this, "<param> has no 'name'");
        return false;
      }
      if (StringHelper.hasNoText (m_sValue))
      {
        aErrorHandler.error (this, "<param> has no 'value'");
        return false;
      }
      return true;
    }
  
    public void validateCompletely (@Nonnull final IPSErrorHandler aErrorHandler)
    {
      if (StringHelper.hasNoText (m_sName))
        aErrorHandler.error (this, "<param> has no 'name'");
      if (StringHelper.hasNoText (m_sValue))
        aErrorHandler.error (this, "<param> has no 'value'");
    }
  
    public boolean isMinimal ()
    {
      return false;
    }
  
    public void setName (@Nullable final String sName)
    {
      m_sName = sName;
    }
  
    @Nullable
    public String getName ()
    {
      return m_sName;
    }
  
    public void setValue (@Nullable final String sValue)
    {
      if (sValue != null && sValue.length () == 0)
        throw new IllegalArgumentException ("value may not be empty!");
      m_sValue = sValue;
    }
  
    @Nullable
    public String getValue ()
    {
      return m_sValue;
    }
  
   @Nonnull
   public IMicroElement getAsMicroElement ()
   {
     final IMicroElement ret = new MicroElement (CSchematron.NAMESPACE_SCHEMATRON, CSchematronXML.ELEMENT_PARAM);
     ret.setAttribute (CSchematronXML.ATTR_NAME, m_sName);
     ret.setAttribute (CSchematronXML.ATTR_VALUE, m_sValue);
     return ret;
   }
 
   @Override
   public String toString ()
   {
     return new ToStringGenerator (this).appendIfNotNull ("name", m_sName)
                                        .appendIfNotNull ("value", m_sValue)
                                        .toString ();
   }
 }