package liquibase.util.csv.opencsv.bean;

 import liquibase.util.csv.opencsv.CSVReader;

 import java.beans.BeanInfo;

 import java.beans.IntrospectionException;

 import java.beans.Introspector;

 import java.beans.PropertyDescriptor;

 import java.io.IOException;

 /**

  * Copyright 2007 Kyle Miller.

  * 

  * 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.

  */

 public class HeaderColumnNameMappingStrategy implements MappingStrategy {

     protected String[] header;

     protected PropertyDescriptor[] descriptors;

     protected Class type;

     public void captureHeader(CSVReader reader) throws IOException {

         header = reader.readNext();

     }

     public PropertyDescriptor findDescriptor(int col) throws IntrospectionException {

         String columnName = getColumnName(col);

         return (null != columnName && columnName.trim().length() > 0) ? findDescriptor(columnName) : null;

     }

     protected String getColumnName(int col) {

         return (null != header && col < header.length) ? header[col] : null;

     }

     protected PropertyDescriptor findDescriptor(String name) throws IntrospectionException {

         if (null == descriptors)

             descriptors = loadDescriptors(getType()); // lazy load descriptors

         for (int i = 0; i < descriptors.length; i++) {

             PropertyDescriptor desc = descriptors[i];

             if (matches(name, desc))

                 return desc;

         }

         return null;

     }

     protected boolean matches(String name, PropertyDescriptor desc) {

         return desc.getName().equals(name);

     }

     protected PropertyDescriptor[] loadDescriptors(Class cls) throws IntrospectionException {

         BeanInfo beanInfo = Introspector.getBeanInfo(cls);

         return beanInfo.getPropertyDescriptors();

     }

     public Object createBean() throws InstantiationException, IllegalAccessException {

         return type.newInstance();

     }

     public Class getType() {

         return type;

     }

     public void setType(Class type) {

         this.type = type;

     }

 }