Package org.apache.cayenne.graph
Class NodeDiff
- java.lang.Object
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- org.apache.cayenne.graph.NodeDiff
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- All Implemented Interfaces:
Serializable
,Comparable<NodeDiff>
,GraphDiff
- Direct Known Subclasses:
ArcCreateOperation
,ArcDeleteOperation
,NodeCreateOperation
,NodeDeleteOperation
,NodeIdChangeOperation
,NodePropertyChangeOperation
,ObjectDiff
public abstract class NodeDiff extends Object implements GraphDiff, Comparable<NodeDiff>
An abstract superclass of operations on individual nodes and arcs in a digraph.- Since:
- 1.2
- See Also:
- Serialized Form
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description abstract void
apply(GraphChangeHandler tracker)
Calls appropriate methods on the handler to "replay" this change.int
compareTo(NodeDiff o)
Implements a Comparable interface method to compare based on diffId property.int
getDiffId()
Returns an id of this diff that can be used for various purposes, such as identifying the order of the diff in a sequence.Object
getNodeId()
boolean
isNoop()
Returns true if this diff is simply a placeholder and does not perform any actual operation.void
setDiffId(int diffId)
Sets an id of this diff that can be used for various purposes, such as identifying the order of the diff in a sequence.abstract void
undo(GraphChangeHandler tracker)
Calls appropriate methods on the handler to revert this change.
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Field Detail
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diffId
protected int diffId
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nodeId
protected Object nodeId
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Method Detail
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isNoop
public boolean isNoop()
Description copied from interface:GraphDiff
Returns true if this diff is simply a placeholder and does not perform any actual operation.
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apply
public abstract void apply(GraphChangeHandler tracker)
Description copied from interface:GraphDiff
Calls appropriate methods on the handler to "replay" this change.
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undo
public abstract void undo(GraphChangeHandler tracker)
Description copied from interface:GraphDiff
Calls appropriate methods on the handler to revert this change.
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getNodeId
public Object getNodeId()
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getDiffId
public int getDiffId()
Returns an id of this diff that can be used for various purposes, such as identifying the order of the diff in a sequence.
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setDiffId
public void setDiffId(int diffId)
Sets an id of this diff that can be used for various purposes, such as identifying the order of the diff in a sequence.
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compareTo
public int compareTo(NodeDiff o)
Implements a Comparable interface method to compare based on diffId property.- Specified by:
compareTo
in interfaceComparable<NodeDiff>
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