content: package com.airhacks.enhydrator.transform;
  
  /*
   * #%L
   * enhydrator
   * %%
   * Copyright (C) 2015 Adam Bien
   * %%
   * 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.
   * #L%
   */
  import com.airhacks.enhydrator.flexpipe.RowTransformation;
  import com.airhacks.enhydrator.in.Column;
  import com.airhacks.enhydrator.in.Row;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Objects;
  import java.util.stream.Collectors;
  import javax.xml.bind.annotation.XmlAccessType;
  import javax.xml.bind.annotation.XmlAccessorType;
  import javax.xml.bind.annotation.XmlElement;
  import javax.xml.bind.annotation.XmlRootElement;
  
  @XmlRootElement(name = "column-copier")
  @XmlAccessorType(XmlAccessType.FIELD)
  public class ColumnCopier extends RowTransformation {
  
      Map<String, NameList> columnMappings;
  
      public ColumnCopier(Map<String, NameList> columnMappings) {
          this.columnMappings = columnMappings;
      }
  
      public ColumnCopier() {
          this.columnMappings = new HashMap<>();
      }
  
      public void addMapping(String columnName, List<String> targetNames) {
          this.columnMappings.put(columnName, new NameList(targetNames));
      }
  
      public void addMapping(String columnName, String... targetNames) {
          this.addMapping(columnName, Arrays.asList(targetNames));
      }
  
      @Override
      public Row execute(Row row) {
          if (row == null) {
              return null;
          }
          List<Column> columnsToCopy = columnMappings.keySet().stream().
                  filter(f -> row.getColumnByName(f) != null).
                  map(m -> row.getColumnByName(m)).
                  collect(Collectors.toList());
          columnsToCopy.forEach(c -> copyColumn(row, c, columnMappings.get(c.getName())));
  
          return row;
      }
  
      void copyColumn(Row row, Column column, NameList names) {
          if (column == null) {
              return;
          }
          names.getColumnList().forEach(n -> row.addColumn(copy(n, column)));
      }
  
      Column copy(String name, Column column) {
          Column clone = column.clone();
          clone.setName(name);
          return clone;
      }
  
      @XmlRootElement
      @XmlAccessorType(XmlAccessType.FIELD)
      public static class NameList {
  
          @XmlElement(name = "column")
          List<String> columnList;
  
          public NameList(List<String> columnList) {
              this.columnList = columnList;
          }
  
          public NameList() {
              this.columnList = new ArrayList<>();
          }
  
          public List<String> getColumnList() {
              return columnList;
          }
  
          @Override
          public int hashCode() {
              int hash = 3;
              hash = 37 * hash + Objects.hashCode(this.columnList);
              return hash;
          }
  
          @Override
          public boolean equals(Object obj) {
              if (this == obj) {
                  return true;
              }
              if (obj == null) {
                  return false;
              }
              if (getClass() != obj.getClass()) {
                  return false;
              }
              final NameList other = (NameList) obj;
              if (!Objects.equals(this.columnList, other.columnList)) {
                  return false;
              }
              return true;
          }
  
      }
  
      @Override
      public int hashCode() {
          int hash = 3;
          hash = 61 * hash + Objects.hashCode(this.columnMappings);
          return hash;
      }
  
      @Override
      public boolean equals(Object obj) {
          if (this == obj) {
              return true;
          }
          if (obj == null) {
              return false;
          }
          if (getClass() != obj.getClass()) {
              return false;
          }
          final ColumnCopier other = (ColumnCopier) obj;
          if (!Objects.equals(this.columnMappings, other.columnMappings)) {
              return false;
          }
          return true;
      }
  
  }
  