encapsulation code to method level for reuse

Author: mawen12

src/main/java/org/apache/ibatis/type/BlobTypeHandler.java

@@ -36,31 +36,20 @@ public void setNonNullParameter(PreparedStatement ps, int i, byte[] parameter, J
 
   @Override
   public byte[] getNullableResult(ResultSet rs, String columnName) throws SQLException {
-    Blob blob = rs.getBlob(columnName);
-    byte[] returnValue = null;
-    if (null != blob) {
-      returnValue = blob.getBytes(1, (int) blob.length());
-    }
-    return returnValue;
+    return toPrimitiveBytes(rs.getBlob(columnName));
   }
 
   @Override
   public byte[] getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
-    Blob blob = rs.getBlob(columnIndex);
-    byte[] returnValue = null;
-    if (null != blob) {
-      returnValue = blob.getBytes(1, (int) blob.length());
-    }
-    return returnValue;
+    return toPrimitiveBytes(rs.getBlob(columnIndex));
   }
 
   @Override
   public byte[] getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
-    Blob blob = cs.getBlob(columnIndex);
-    byte[] returnValue = null;
-    if (null != blob) {
-      returnValue = blob.getBytes(1, (int) blob.length());
-    }
-    return returnValue;
+    return toPrimitiveBytes(cs.getBlob(columnIndex));
+  }
+
+  private byte[] toPrimitiveBytes(Blob blob) throws SQLException {
+    return blob == null ? null : blob.getBytes(1, (int) blob.length());
   }
 }

src/main/java/org/apache/ibatis/type/CharacterTypeHandler.java

@@ -33,28 +33,20 @@ public void setNonNullParameter(PreparedStatement ps, int i, Character parameter
 
   @Override
   public Character getNullableResult(ResultSet rs, String columnName) throws SQLException {
-    String columnValue = rs.getString(columnName);
-    if (columnValue != null && !columnValue.isEmpty()) {
-      return columnValue.charAt(0);
-    }
-    return null;
+    return toCharacter(rs.getString(columnName));
   }
 
   @Override
   public Character getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
-    String columnValue = rs.getString(columnIndex);
-    if (columnValue != null && !columnValue.isEmpty()) {
-      return columnValue.charAt(0);
-    }
-    return null;
+    return toCharacter(rs.getString(columnIndex));
   }
 
   @Override
   public Character getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
-    String columnValue = cs.getString(columnIndex);
-    if (columnValue != null && !columnValue.isEmpty()) {
-      return columnValue.charAt(0);
-    }
-    return null;
+    return toCharacter(cs.getString(columnIndex));
+  }
+
+  private Character toCharacter(String value) {
+    return value == null || value.isEmpty() ? null : value.charAt(0);
   }
 }

src/main/java/org/apache/ibatis/type/DateOnlyTypeHandler.java

@@ -33,29 +33,21 @@ public void setNonNullParameter(PreparedStatement ps, int i, Date parameter, Jdb
 
   @Override
   public Date getNullableResult(ResultSet rs, String columnName) throws SQLException {
-    java.sql.Date sqlDate = rs.getDate(columnName);
-    if (sqlDate != null) {
-      return new Date(sqlDate.getTime());
-    }
-    return null;
+    return toSqlDate(rs.getDate(columnName));
   }
 
   @Override
   public Date getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
-    java.sql.Date sqlDate = rs.getDate(columnIndex);
-    if (sqlDate != null) {
-      return new Date(sqlDate.getTime());
-    }
-    return null;
+    return toSqlDate(rs.getDate(columnIndex));
   }
 
   @Override
   public Date getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
-    java.sql.Date sqlDate = cs.getDate(columnIndex);
-    if (sqlDate != null) {
-      return new Date(sqlDate.getTime());
-    }
-    return null;
+    return toSqlDate(cs.getDate(columnIndex));
+  }
+
+  private java.sql.Date toSqlDate(Date date) {
+    return date == null ? null : new java.sql.Date(date.getTime());
   }
 
 }

src/main/java/org/apache/ibatis/type/DateTypeHandler.java

@@ -34,28 +34,21 @@ public void setNonNullParameter(PreparedStatement ps, int i, Date parameter, Jdb
 
   @Override
   public Date getNullableResult(ResultSet rs, String columnName) throws SQLException {
-    Timestamp sqlTimestamp = rs.getTimestamp(columnName);
-    if (sqlTimestamp != null) {
-      return new Date(sqlTimestamp.getTime());
-    }
-    return null;
+    return toDate(rs.getTimestamp(columnName));
   }
 
   @Override
   public Date getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
-    Timestamp sqlTimestamp = rs.getTimestamp(columnIndex);
-    if (sqlTimestamp != null) {
-      return new Date(sqlTimestamp.getTime());
-    }
-    return null;
+    return toDate(rs.getTimestamp(columnIndex));
   }
 
   @Override
   public Date getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
-    Timestamp sqlTimestamp = cs.getTimestamp(columnIndex);
-    if (sqlTimestamp != null) {
-      return new Date(sqlTimestamp.getTime());
-    }
-    return null;
+    return toDate(cs.getTimestamp(columnIndex));
   }
+
+  private Date toDate(Timestamp timestamp) {
+    return timestamp == null ? null : new Date(timestamp.getTime());
+  }
+
 }

src/main/java/org/apache/ibatis/type/TimeOnlyTypeHandler.java

@@ -34,28 +34,21 @@ public void setNonNullParameter(PreparedStatement ps, int i, Date parameter, Jdb
 
   @Override
   public Date getNullableResult(ResultSet rs, String columnName) throws SQLException {
-    Time sqlTime = rs.getTime(columnName);
-    if (sqlTime != null) {
-      return new Date(sqlTime.getTime());
-    }
-    return null;
+    return toDate(rs.getTime(columnName));
   }
 
   @Override
   public Date getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
-    Time sqlTime = rs.getTime(columnIndex);
-    if (sqlTime != null) {
-      return new Date(sqlTime.getTime());
-    }
-    return null;
+    return toDate(rs.getTime(columnIndex));
   }
 
   @Override
   public Date getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
-    Time sqlTime = cs.getTime(columnIndex);
-    if (sqlTime != null) {
-      return new Date(sqlTime.getTime());
-    }
-    return null;
+    return toDate(cs.getTime(columnIndex));
   }
+
+  private Date toDate(Time time) {
+    return time == null ? null : new Date(time.getTime());
+  }
+
 }

src/main/java/org/apache/ibatis/type/YearMonthTypeHandler.java

@@ -40,19 +40,20 @@ public void setNonNullParameter(PreparedStatement ps, int i, YearMonth yearMonth
 
   @Override
   public YearMonth getNullableResult(ResultSet rs, String columnName) throws SQLException {
-    String value = rs.getString(columnName);
-    return value == null ? null : YearMonth.parse(value);
+    return toYearMonth(rs.getString(columnName));
   }
 
   @Override
   public YearMonth getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
-    String value = rs.getString(columnIndex);
-    return value == null ? null : YearMonth.parse(value);
+    return toYearMonth(rs.getString(columnIndex));
   }
 
   @Override
   public YearMonth getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
-    String value = cs.getString(columnIndex);
+    return toYearMonth(cs.getString(columnIndex));
+  }
+
+  private YearMonth toYearMonth(String value) {
     return value == null ? null : YearMonth.parse(value);
   }