org.eclipse.rdf4j.sail.memory.model

## Class MemTriple

- java.lang.Object
- - org.eclipse.rdf4j.sail.memory.model.MemTriple

- All Implemented Interfaces:
    Serializable, Resource, Triple, Value, MemResource, MemValue

      public class MemTriple
      extends Object
      implements Triple, MemResource

  A MemoryStore-specific implementation of `Triple`.
  Author:
    Jeen Broekstra
  See Also:
    Serialized Form

- - ### Field Summary

    - ### Fields inherited from interface org.eclipse.rdf4j.sail.memory.model.MemValue

      `EMPTY_LIST`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `MemTriple(Object creator, MemResource subject, MemIRI predicate, MemValue object)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addContextStatement(MemStatement st)` Adds a statement to this MemResource's list of statements for which it represents the context.
    `void` | `addObjectStatement(MemStatement st)` Adds a statement to this MemValue's list of statements for which it is the object.
    `void` | `addSubjectStatement(MemStatement st)` Adds a statement to this MemResource's list of statements for which it is the subject.
    `void` | `cleanSnapshotsFromContextStatements(int currentSnapshot)` Removes statements from old snapshots (those that have expired at or before the specified snapshot version) from this MemValue's list of statements for which it is the context.
    `void` | `cleanSnapshotsFromObjectStatements(int currentSnapshot)` Removes statements from old snapshots (those that have expired at or before the specified snapshot version) from this MemValue's list of statements for which it is the object.
    `void` | `cleanSnapshotsFromSubjectStatements(int currentSnapshot)` Removes statements from old snapshots (those that have expired at or before the specified snapshot version) from this MemValue's list of statements for which it is the subject.
    `boolean` | `equals(Object other)` Compares this triple to another object.
    `int` | `getContextStatementCount()` Gets the number of statements for which this MemResource represents the context.
    `MemStatementList` | `getContextStatementList()` Gets the list of statements for which this MemResource represents the context.
    `Object` | `getCreator()` Returns the object that created this MemValue.
    `Value` | `getObject()` Gets the object of this triple.
    `int` | `getObjectStatementCount()` Gets the number of statements for which this MemValue is the object.
    `MemStatementList` | `getObjectStatementList()` Gets the list of statements for which this MemValue is the object.
    `IRI` | `getPredicate()` Gets the predicate of this triple.
    `Resource` | `getSubject()` Gets the subject of this triple.
    `int` | `getSubjectStatementCount()` Gets the number of statements for which this MemResource is the subject.
    `MemStatementList` | `getSubjectStatementList()` Gets the list of statements for which this MemResource is the subject.
    `int` | `hashCode()` Computes the hash code of this triple.
    `boolean` | `hasStatements()` Checks whether this MemValue has any statements.
    `void` | `removeContextStatement(MemStatement st)` Removes a statement from this MemResource's list of statements for which it represents the context.
    `void` | `removeObjectStatement(MemStatement st)` Removes a statement from this MemValue's list of statements for which it is the object.
    `void` | `removeSubjectStatement(MemStatement st)` Removes a statement from this MemResource's list of statements for which it is the subject.
    `String` | `stringValue()` Returns the String-value of a `Value` object.
    `String` | `toString()`

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

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

- - ### Constructor Detail

    - #### MemTriple

          public MemTriple(Object creator,
                           MemResource subject,
                           MemIRI predicate,
                           MemValue object)

  - ### Method Detail

    - #### stringValue

          public String stringValue()

      Description copied from interface: `Value`
      Returns the String-value of a `Value` object. This returns either a `Literal`'s label, a `IRI`'s URI or a `BNode`'s ID.
      Specified by:
        `stringValue` in interface `Value`

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`

    - #### getCreator

          public Object getCreator()

      Description copied from interface: `MemValue`
      Returns the object that created this MemValue. MemValues are only unique within a single repository, but an application could use several repositories at the same time, passing MemValues generated by one Sail to another Sail. In such situations, the MemValue of the first Sail cannot be used by the second Sail.
      Specified by:
        `getCreator` in interface `MemValue`

    - #### hasStatements

          public boolean hasStatements()

      Description copied from interface: `MemValue`
      Checks whether this MemValue has any statements. A MemValue object has statements if there is at least one statement where it is used as the subject, predicate, object or context value.
      Specified by:
        `hasStatements` in interface `MemValue`
      Returns:
        `true` if the MemValue has statements, `false` otherwise.

    - #### getObjectStatementList

          public MemStatementList getObjectStatementList()

      Description copied from interface: `MemValue`
      Gets the list of statements for which this MemValue is the object.
      Specified by:
        `getObjectStatementList` in interface `MemValue`
      Returns:
        A MemStatementList containing the statements.

    - #### getObjectStatementCount

          public int getObjectStatementCount()

      Description copied from interface: `MemValue`
      Gets the number of statements for which this MemValue is the object.
      Specified by:
        `getObjectStatementCount` in interface `MemValue`
      Returns:
        An integer larger than or equal to 0.

    - #### addObjectStatement

          public void addObjectStatement(MemStatement st)

      Description copied from interface: `MemValue`
      Adds a statement to this MemValue's list of statements for which it is the object.
      Specified by:
        `addObjectStatement` in interface `MemValue`

    - #### removeObjectStatement

          public void removeObjectStatement(MemStatement st)

      Description copied from interface: `MemValue`
      Removes a statement from this MemValue's list of statements for which it is the object.
      Specified by:
        `removeObjectStatement` in interface `MemValue`

    - #### cleanSnapshotsFromObjectStatements

          public void cleanSnapshotsFromObjectStatements(int currentSnapshot)

      Description copied from interface: `MemValue`
      Removes statements from old snapshots (those that have expired at or before the specified snapshot version) from this MemValue's list of statements for which it is the object.
      Specified by:
        `cleanSnapshotsFromObjectStatements` in interface `MemValue`
      Parameters:
        `currentSnapshot` - The current snapshot version.

    - #### getSubjectStatementList

          public MemStatementList getSubjectStatementList()

      Description copied from interface: `MemResource`
      Gets the list of statements for which this MemResource is the subject.
      Specified by:
        `getSubjectStatementList` in interface `MemResource`
      Returns:
        a MemStatementList containing the statements.

    - #### getSubjectStatementCount

          public int getSubjectStatementCount()

      Description copied from interface: `MemResource`
      Gets the number of statements for which this MemResource is the subject.
      Specified by:
        `getSubjectStatementCount` in interface `MemResource`
      Returns:
        An integer larger than or equal to 0.

    - #### addSubjectStatement

          public void addSubjectStatement(MemStatement st)

      Description copied from interface: `MemResource`
      Adds a statement to this MemResource's list of statements for which it is the subject.
      Specified by:
        `addSubjectStatement` in interface `MemResource`

    - #### removeSubjectStatement

          public void removeSubjectStatement(MemStatement st)

      Description copied from interface: `MemResource`
      Removes a statement from this MemResource's list of statements for which it is the subject.
      Specified by:
        `removeSubjectStatement` in interface `MemResource`

    - #### cleanSnapshotsFromSubjectStatements

          public void cleanSnapshotsFromSubjectStatements(int currentSnapshot)

      Description copied from interface: `MemResource`
      Removes statements from old snapshots (those that have expired at or before the specified snapshot version) from this MemValue's list of statements for which it is the subject.
      Specified by:
        `cleanSnapshotsFromSubjectStatements` in interface `MemResource`
      Parameters:
        `currentSnapshot` - The current snapshot version.

    - #### getContextStatementList

          public MemStatementList getContextStatementList()

      Description copied from interface: `MemResource`
      Gets the list of statements for which this MemResource represents the context.
      Specified by:
        `getContextStatementList` in interface `MemResource`
      Returns:
        a MemStatementList containing the statements.

    - #### getContextStatementCount

          public int getContextStatementCount()

      Description copied from interface: `MemResource`
      Gets the number of statements for which this MemResource represents the context.
      Specified by:
        `getContextStatementCount` in interface `MemResource`
      Returns:
        An integer larger than or equal to 0.

    - #### addContextStatement

          public void addContextStatement(MemStatement st)

      Description copied from interface: `MemResource`
      Adds a statement to this MemResource's list of statements for which it represents the context.
      Specified by:
        `addContextStatement` in interface `MemResource`

    - #### removeContextStatement

          public void removeContextStatement(MemStatement st)

      Description copied from interface: `MemResource`
      Removes a statement from this MemResource's list of statements for which it represents the context.
      Specified by:
        `removeContextStatement` in interface `MemResource`

    - #### cleanSnapshotsFromContextStatements

          public void cleanSnapshotsFromContextStatements(int currentSnapshot)

      Description copied from interface: `MemResource`
      Removes statements from old snapshots (those that have expired at or before the specified snapshot version) from this MemValue's list of statements for which it is the context.
      Specified by:
        `cleanSnapshotsFromContextStatements` in interface `MemResource`
      Parameters:
        `currentSnapshot` - The current snapshot version.

    - #### getSubject

          public Resource getSubject()

      Description copied from interface: `Triple`
      Gets the subject of this triple.
      Specified by:
        `getSubject` in interface `Triple`
      Returns:
        The triple's subject.

    - #### getPredicate

          public IRI getPredicate()

      Description copied from interface: `Triple`
      Gets the predicate of this triple.
      Specified by:
        `getPredicate` in interface `Triple`
      Returns:
        The triple's predicate.

    - #### getObject

          public Value getObject()

      Description copied from interface: `Triple`
      Gets the object of this triple.
      Specified by:
        `getObject` in interface `Triple`
      Returns:
        The triple's object.

    - #### hashCode

          public int hashCode()

      Description copied from interface: `Triple`
      Computes the hash code of this triple.
      Specified by:
        `hashCode` in interface `Triple`
      Overrides:
        `hashCode` in class `Object`
      Returns:
        a hash code for this triple computed as `Objects.hash`( `Triple.getSubject()`, `Triple.getPredicate()`, `Triple.getObject()`)

    - #### equals

          public boolean equals(Object other)

      Description copied from interface: `Triple`
      Compares this triple to another object.
      Specified by:
        `equals` in interface `Triple`
      Overrides:
        `equals` in class `Object`
      Parameters:
        `other` - the object to compare this triple to
      Returns:
        `true` if the `other` object is an instance of `Triple` and if their subjects, predicates and objects are equal; `false` otherwise

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