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## org.modeshape.graph.query.model
Class PropertyExistence

    java.lang.Object
      org.modeshape.graph.query.model.PropertyExistence

All Implemented Interfaces:
  Serializable, Constraint, LanguageObject, Visitable

Direct Known Subclasses:
  JcrPropertyExistence

    @Immutable
    public class PropertyExistence

extends Object
implements Constraint

A constraint that evaluates to true only when a named property exists on a node.

See Also:
  Serialized Form

Constructor Summary
`PropertyExistence(SelectorName selectorName, String propertyName)` Create a constraint requiring that a property exist on a node.

Method Summary
`void` | `accept(Visitor visitor)` Accept the supplied visitor, which should call back to the visitor to complete the double-dispatch operation.
`boolean` | `equals(Object obj)`
`int` | `hashCode()`
`String` | `propertyName()` Get the name of the property.
`SelectorName` | `selectorName()` Get the name of the selector.
`String` | `toString()`

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

Constructor Detail

### PropertyExistence

    public PropertyExistence(SelectorName selectorName,
                             String propertyName)

  Create a constraint requiring that a property exist on a node.

  Parameters:
    `selectorName` - the name of the node selector
    `propertyName` - the name of the property that must exist

Method Detail

### selectorName

    public final SelectorName selectorName()

  Get the name of the selector.

  Returns:
    the selector name; never null

### propertyName

    public final String propertyName()

  Get the name of the property.

  Returns:
    the property name; never null

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`
  See Also:
    `Object.toString()`

### hashCode

    public int hashCode()

  Overrides:
    `hashCode` in class `Object`
  See Also:
    `Object.hashCode()`

### equals

    public boolean equals(Object obj)

  Overrides:
    `equals` in class `Object`
  See Also:
    `Object.equals(java.lang.Object)`

### accept

    public void accept(Visitor visitor)

  Accept the supplied visitor, which should call back to the visitor to complete the double-dispatch operation.

  Specified by:
    `accept` in interface `Visitable`
  Parameters:
    `visitor` - the visitor; never null
  See Also:
    `Visitable.accept(org.modeshape.graph.query.model.Visitor)`

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