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   *  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
   *
   *    https://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
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   ****************************************************************/
  
  package org.apache.cayenne.access.types;
  
  import java.sql.CallableStatement;
  import java.sql.PreparedStatement;
  import java.sql.ResultSet;
  import java.sql.Types;
  
  /**
   * Handles <code>java.lang.Boolean</code> mapping. Note that "materialize*" methods return
   * either Boolean.TRUE or Boolean.FALSE, instead of creating new Boolean instances using
   * constructor. This makes possible identity comparison such as
   * <code>object.getBooleanProperty() == Boolean.TRUE</code>.
   * 
   * @since 1.2
   */
  public class BooleanType implements ExtendedType<Boolean> {
  
      @Override
      public String getClassName() {
          return Boolean.class.getName();
      }
  
      @Override
      public void setJdbcObject(
              PreparedStatement st,
              Boolean val,
              int pos,
              int type,
              int precision) throws Exception {
  
          if (val == null) {
              st.setNull(pos, type);
          } else if (type == Types.BIT || type == Types.BOOLEAN) {
              boolean flag = Boolean.TRUE.equals(val);
              st.setBoolean(pos, flag);
          } else {
              st.setObject(pos, val, type);
          }
      }
  
      @Override
      public Boolean materializeObject(ResultSet rs, int index, int type) throws Exception {
          boolean b = rs.getBoolean(index);
          return (rs.wasNull()) ? null : b ? Boolean.TRUE : Boolean.FALSE;
      }
  
      @Override
      public Boolean materializeObject(CallableStatement st, int index, int type) throws Exception {
          boolean b = st.getBoolean(index);
          return (st.wasNull()) ? null : b ? Boolean.TRUE : Boolean.FALSE;
      }
  
      @Override
      public String toString(Boolean value) {
          if (value == null) {
              return "NULL";
          }
  
          return '\'' + value.toString() + '\'';
      }
  }
  