package com.opencsv.bean;

import java.util.HashMap;
import java.util.Map;

/*
 * Copyright 2007,2010 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.
 */

Expands on HeaderColumnNameMappingStrategy by allowing the user to pass in a map of column names to bean names. This way the fields in the bean do not have to match the fields in the CSV file. This is only for when the user passes in the header names programmatically, and not for annotated beans. 
Type parameters:
<T> – Class to be mapped./**
 * Expands on {@link HeaderColumnNameMappingStrategy} by allowing the user to
 * pass in a map of column names to bean names.
 * This way the fields in the bean do not have to match the fields in the CSV
 * file. This is only for when the user passes in the header names
 * programmatically, and not for annotated beans.
 *
 * @param <T> Class to be mapped.
 */
public class HeaderColumnNameTranslateMappingStrategy<T> extends HeaderNameBaseMappingStrategy<T> {
    private final Map<String, String> columnMapping;

    
Default constructor.
/**
     * Default constructor.
     */
    public HeaderColumnNameTranslateMappingStrategy() {
        columnMapping = new HashMap<>();
    }

    @Override
    public String getColumnName(int col) {
        String name = headerIndex.getByPosition(col);
        if(name != null) {
            name = columnMapping.get(name.toUpperCase());
        }
        return name;
    }

    
Retrieves the column mappings of the strategy.
Returns:
The column mappings of the strategy./**
     * Retrieves the column mappings of the strategy.
     * @return The column mappings of the strategy.
     */
    public Map<String, String> getColumnMapping() {
        return columnMapping;
    }

    
Sets the column mapping to those passed in.
Params:
columnMapping – Source column mapping./**
     * Sets the column mapping to those passed in.
     * @param columnMapping Source column mapping.
     */
    public void setColumnMapping(Map<String, String> columnMapping) {
        this.columnMapping.clear();
        for (Map.Entry<String, String> entry : columnMapping.entrySet()) {
            this.columnMapping.put(entry.getKey().toUpperCase(), entry.getValue());
        }
        if(getType() != null) {
            loadFieldMap();
        }
    }
}