org.apache.cayenne.map

## Class DbJoin

- java.lang.Object
- - org.apache.cayenne.map.DbJoin

- All Implemented Interfaces:
    Serializable, XMLSerializable

      public class DbJoin
      extends Object
      implements XMLSerializable, Serializable

  Defines a join between two attributes of a given relationship.
  Since:
    1.1
  See Also:
    Serialized Form

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected DbRelationship` | `relationship`
    `protected String` | `sourceName`
    `protected String` | `targetName`

  - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `DbJoin()`
    `` | `DbJoin(DbRelationship relationship)`
    `` | `DbJoin(DbRelationship relationship, String sourceName, String targetName)`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `DbJoin` | `createReverseJoin()` Returns a "reverse" join.
    `void` | `encodeAsXML(XMLEncoder encoder)` Prints itself as XML to the provided XMLEncoder.
    `DbRelationship` | `getRelationship()`
    `DbAttribute` | `getSource()` Returns DbAttribute on on the left side of the join.
    `String` | `getSourceName()`
    `DbAttribute` | `getTarget()`
    `String` | `getTargetName()`
    `void` | `setRelationship(DbRelationship relationship)`
    `void` | `setSourceName(String string)`
    `void` | `setTargetName(String string)`
    `String` | `toString()`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- - ### Field Detail

    - #### relationship

          protected DbRelationship relationship

    - #### sourceName

          protected String sourceName

    - #### targetName

          protected String targetName

  - ### Constructor Detail

    - #### DbJoin

          protected DbJoin()

    - #### DbJoin

          public DbJoin(DbRelationship relationship)

    - #### DbJoin

          public DbJoin(DbRelationship relationship,
                String sourceName,
                String targetName)

  - ### Method Detail

    - #### createReverseJoin

          public DbJoin createReverseJoin()

      Returns a "reverse" join. Join source relationship is not set and must be initialized by the caller.

    - #### getSource

          public DbAttribute getSource()

      Returns DbAttribute on on the left side of the join.

    - #### getTarget

          public DbAttribute getTarget()

    - #### encodeAsXML

          public void encodeAsXML(XMLEncoder encoder)

      Prints itself as XML to the provided XMLEncoder.
      Specified by:
        `encodeAsXML` in interface `XMLSerializable`

    - #### getRelationship

          public DbRelationship getRelationship()

    - #### getSourceName

          public String getSourceName()

    - #### getTargetName

          public String getTargetName()

    - #### setRelationship

          public void setRelationship(DbRelationship relationship)

    - #### setSourceName

          public void setSourceName(String string)

    - #### setTargetName

          public void setTargetName(String string)

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`

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