package org.apache.commons.digester3.xmlrules;
   
   /*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.
   */
  
  import org.apache.commons.digester3.binder.CallParamBuilder;
  import org.apache.commons.digester3.binder.LinkedRuleBuilder;
  import org.apache.commons.digester3.binder.RulesBinder;
  import org.xml.sax.Attributes;
  
  /**
   * 
   */
  final class CallParamRule
      extends AbstractXmlRule
  {
  
      public CallParamRule( RulesBinder targetRulesBinder, PatternStack patternStack )
      {
          super( targetRulesBinder, patternStack );
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      protected void bindRule( LinkedRuleBuilder linkedRuleBuilder, Attributes attributes )
          throws Exception
      {
          int paramIndex = Integer.parseInt( attributes.getValue( "paramnumber" ) );
          CallParamBuilder builder = linkedRuleBuilder.callParam().ofIndex( paramIndex );
  
          String attributeName = attributes.getValue( "attrname" );
          String fromStack = attributes.getValue( "from-stack" );
          String stackIndex = attributes.getValue( "stack-index" );
  
          if ( attributeName == null )
          {
              if ( stackIndex != null )
              {
                  builder.withStackIndex( Integer.parseInt( stackIndex ) );
              }
              else if ( fromStack != null )
              {
                  builder.fromStack( Boolean.valueOf( fromStack ).booleanValue() );
              }
          }
          else
          {
              if ( fromStack == null )
              {
                  builder.fromAttribute( attributeName );
              }
              else
              {
                  // specifying both from-stack and attribute name is not allowed
                  throw new RuntimeException( "Attributes from-stack and attrname cannot both be present." );
              }
          }
      }
  
  }