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## org.apache.cayenne.query
Class Ordering

    java.lang.Object
      org.apache.cayenne.query.Ordering

All Implemented Interfaces:
  Serializable, Comparator<Object>, XMLSerializable

    public class Ordering

extends Object
implements Comparator<Object>, Serializable, XMLSerializable

Defines object sorting criteria, used either for in-memory sorting of object lists or as a specification for building ORDER BY clause of a SelectQuery query. Note that in case of in-memory sorting, Ordering can be used with any JavaBeans, not just DataObjects.

See Also:
  Serialized Form

Field Summary
`protected boolean` | `nullSortedFirst`
`protected boolean` | `pathExceptionSuppressed`
`protected SortOrder` | `sortOrder`
`protected Expression` | `sortSpec`
`protected String` | `sortSpecString`

Constructor Summary
`Ordering()`
`Ordering(String sortPathSpec, SortOrder sortOrder)`

Method Summary
`int` | `compare(Object o1, Object o2)` Comparable interface implementation.
`void` | `encodeAsXML(XMLEncoder encoder)` Encodes itself as a query ordering.
`SortOrder` | `getSortOrder()` Returns sort order for this ordering
`Expression` | `getSortSpec()` Returns the expression defining a ordering Java Bean property.
`String` | `getSortSpecString()` Returns sortSpec string representation.
`boolean` | `isAscending()` Returns true if sorting is done in ascending order.
`boolean` | `isCaseInsensitive()` Returns true if the sorting is case insensitive
`boolean` | `isCaseSensitive()` Returns true if the sorting is case sensitive.
`boolean` | `isDescending()` Returns true if the sorting is done in descending order.
`boolean` | `isNullSortedFirst()` Get sort order for nulls.
`boolean` | `isPathExceptionSuppressed()` Is a path with a null in the middle is ignored.
`void` | `orderList(List<?> objects)` Orders the given list of objects according to the ordering that this object specifies.
`static void` | `orderList(List<?> objects, List<Ordering> orderings)` Orders a given list of objects, using a List of Orderings applied according the default iteration order of the Orderings list.
`void` | `setAscending()` If the sort order is DESCENDING or DESCENDING_INSENSITIVE, sets the sort order to ASCENDING or ASCENDING_INSENSITIVE, respectively.
`void` | `setCaseInsensitive()` If the sort order is ASCENDING or DESCENDING, sets the sort order to ASCENDING_INSENSITIVE or DESCENDING_INSENSITIVE, respectively.
`void` | `setCaseSensitive()` If the sort order is ASCENDING_INSENSITIVE or DESCENDING_INSENSITIVE, sets the sort order to ASCENDING or DESCENDING, respectively.
`void` | `setDescending()` If the sort order is ASCENDING or ASCENDING_INSENSITIVE, sets the sort order to DESCENDING or DESCENDING_INSENSITIVE, respectively.
`void` | `setNullSortedFirst(boolean nullSortedFirst)` Sets sort order for whether nulls are at the top or bottom of the resulting list.
`void` | `setPathExceptionSupressed(boolean pathExceptionSuppressed)` Sets whether a path with a null in the middle is ignored.
`void` | `setSortOrder(SortOrder order)` Sets the sort order for this ordering.
`void` | `setSortSpec(Expression sortSpec)` Sets the expression defining a ordering Java Bean property.
`void` | `setSortSpecString(String sortSpecString)` Sets sortSpec to be an expression represented by string argument.
`String` | `toString()`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Methods inherited from interface java.util.Comparator
`equals`

Field Detail

### sortSpecString

    protected String sortSpecString

### sortSpec

    protected transient Expression sortSpec

### sortOrder

    protected SortOrder sortOrder

### pathExceptionSuppressed

    protected boolean pathExceptionSuppressed

### nullSortedFirst

    protected boolean nullSortedFirst

Constructor Detail

### Ordering

    public Ordering()

### Ordering

    public Ordering(String sortPathSpec,
                    SortOrder sortOrder)

Since:
  3.0

Method Detail

### orderList

    public static void orderList(List<?> objects,
                                 List<Ordering> orderings)

  Orders a given list of objects, using a List of Orderings applied according the default iteration order of the Orderings list. I.e. each Ordering with lower index is more significant than any other Ordering with higher index. List being ordered is modified in place.

### setSortSpecString

    public void setSortSpecString(String sortSpecString)

  Sets sortSpec to be an expression represented by string argument.

  Since:
    1.1

### setNullSortedFirst

    public void setNullSortedFirst(boolean nullSortedFirst)

  Sets sort order for whether nulls are at the top or bottom of the resulting list. Default is true.

  Parameters:
    `nullSortedFirst` - true sorts nulls to the top of the list, false sorts nulls to the bottom

### isNullSortedFirst

    public boolean isNullSortedFirst()

  Get sort order for nulls.

  Returns:
    true if nulls are sorted to the top of the list, false if sorted to the bottom

### setPathExceptionSupressed

    public void setPathExceptionSupressed(boolean pathExceptionSuppressed)

  Sets whether a path with a null in the middle is ignored. For example, a sort from `painting` on `artist.name` would by default throw an exception if the artist was null. If set to true, then this is treated just like a null value. Default is false.

  Parameters:
    `pathExceptionSuppressed` - true to suppress exceptions and sort as null

### isPathExceptionSuppressed

    public boolean isPathExceptionSuppressed()

  Is a path with a null in the middle is ignored.

  Returns:
    true is exception is suppressed and sorted as null

### getSortSpecString

    public String getSortSpecString()

  Returns sortSpec string representation.

  Since:
    1.1

### setSortOrder

    public void setSortOrder(SortOrder order)

  Sets the sort order for this ordering.

  Since:
    3.0

### isAscending

    public boolean isAscending()

  Returns true if sorting is done in ascending order.

### isDescending

    public boolean isDescending()

  Returns true if the sorting is done in descending order.

  Since:
    3.0

### setAscending

    public void setAscending()

  If the sort order is DESCENDING or DESCENDING_INSENSITIVE, sets the sort order to ASCENDING or ASCENDING_INSENSITIVE, respectively.

  Since:
    3.0

### setDescending

    public void setDescending()

  If the sort order is ASCENDING or ASCENDING_INSENSITIVE, sets the sort order to DESCENDING or DESCENDING_INSENSITIVE, respectively.

  Since:
    3.0

### isCaseInsensitive

    public boolean isCaseInsensitive()

  Returns true if the sorting is case insensitive

### isCaseSensitive

    public boolean isCaseSensitive()

  Returns true if the sorting is case sensitive.

  Since:
    3.0

### setCaseInsensitive

    public void setCaseInsensitive()

  If the sort order is ASCENDING or DESCENDING, sets the sort order to ASCENDING_INSENSITIVE or DESCENDING_INSENSITIVE, respectively.

  Since:
    3.0

### setCaseSensitive

    public void setCaseSensitive()

  If the sort order is ASCENDING_INSENSITIVE or DESCENDING_INSENSITIVE, sets the sort order to ASCENDING or DESCENDING, respectively.

  Since:
    3.0

### getSortSpec

    public Expression getSortSpec()

  Returns the expression defining a ordering Java Bean property.

### setSortSpec

    public void setSortSpec(Expression sortSpec)

  Sets the expression defining a ordering Java Bean property.

### orderList

    public void orderList(List<?> objects)

  Orders the given list of objects according to the ordering that this object specifies. List is modified in-place.

  Parameters:
    `objects` - a List of objects to be sorted

### compare

    public int compare(Object o1,
                       Object o2)

  Comparable interface implementation. Can compare two Java Beans based on the stored expression.

  Specified by:
    `compare` in interface `Comparator<Object>`

### encodeAsXML

    public void encodeAsXML(XMLEncoder encoder)

  Encodes itself as a query ordering.

  Specified by:
    `encodeAsXML` in interface `XMLSerializable`
  Since:
    1.1

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`

### getSortOrder

    public SortOrder getSortOrder()

  Returns sort order for this ordering

  Since:
    3.1

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