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

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

    public class Visitors

extends Object

A set of common visitors that can be reused or extended, and methods that provide easy construction and calling of visitors.

Nested Class Summary
`static class` | `Visitors.AbstractVisitor` A common base class for all visitors, which provides no-op implementations for all `visit(...)` methods.
`static class` | `Visitors.NavigationVisitor` An abstract visitor implementation that performs navigation of the query object.
`static class` | `Visitors.ReadableVisitor`
`static class` | `Visitors.WalkAllVisitor` A visitor implementation that walks the entire query object tree and delegates to another supplied visitor to do the actual work.

Constructor Summary
`Visitors()`

Method Summary
`static Map<SelectorName,SelectorName>` | `getSelectorAliasesByName(Visitable visitable)` Get a map of the selector aliases keyed by their names.
`static Map<SelectorName,SelectorName>` | `getSelectorNamesByAlias(Visitable visitable)` Get a map of the selector names keyed by their aliases.
`static Set<SelectorName>` | `getSelectorsReferencedBy(Visitable visitable)` Get the names of the selectors referenced by the visitable object.
`static String` | `readable(Visitable visitable)` Using a visitor, obtain the readable string representation of the supplied `object`
`static Collection<Subquery>` | `subqueries(Visitable visitable, boolean includeNestedSubqueries)` Using a visitor, obtain the `Subquery` objects that are contained within the supplied `object`.
`static
`<GeneralVisitor extends Visitor> GeneralVisitor`
` | `visit(Visitable visitable, GeneralVisitor visitor)` Visit the supplied `object` using the supplied `Visitors.AbstractVisitor`, which must be responsible for navigation as well as any business logic.
`static
`<StrategyVisitor extends Visitor> StrategyVisitor`
` | `visitAll(Visitable visitable, StrategyVisitor strategyVisitor)` Visit all objects in the supplied `object` using a `Visitors.NavigationVisitor` (specifically a `Visitors.WalkAllVisitor`), and with each of these visited objects calling the appropriate `visit(...)` method on the supplied `Visitors.AbstractVisitor`.

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

Constructor Detail

### Visitors

    public Visitors()

Method Detail

### visitAll

    public static <StrategyVisitor extends Visitor> StrategyVisitor visitAll(Visitable visitable,
                                                                             StrategyVisitor strategyVisitor)

  Visit all objects in the supplied `object` using a `Visitors.NavigationVisitor` (specifically a `Visitors.WalkAllVisitor`), and with each of these visited objects calling the appropriate `visit(...)` method on the supplied `Visitors.AbstractVisitor`.

  Type Parameters:
    `StrategyVisitor` - the type of strategy visitor
  Parameters:
    `visitable` - the top-level object to be visited
    `strategyVisitor` - the visitor that is to be called for each visited objects, but that does not call `Visitable.accept(Visitor)`
  Returns:
    the strategy visitor, allowing the caller to easily invoke operations on the visitor after visitation has completed

### visit

    public static <GeneralVisitor extends Visitor> GeneralVisitor visit(Visitable visitable,
                                                                        GeneralVisitor visitor)

  Visit the supplied `object` using the supplied `Visitors.AbstractVisitor`, which must be responsible for navigation as well as any business logic.

  Type Parameters:
    `GeneralVisitor` - the type of visitor
  Parameters:
    `visitable` - the top-level object to be visited
    `visitor` - the visitor that is to be used
  Returns:
    the visitor, allowing the caller to easily invoke operations on the visitor after visitation has completed

### readable

    public static String readable(Visitable visitable)

  Using a visitor, obtain the readable string representation of the supplied `object`

  Parameters:
    `visitable` - the visitable
  Returns:
    the string representation

### subqueries

    public static Collection<Subquery> subqueries(Visitable visitable,
                                                  boolean includeNestedSubqueries)

  Using a visitor, obtain the `Subquery` objects that are contained within the supplied `object`. This method does find Subquery objets nested in other Subquery objects.

  Parameters:
    `visitable` - the visitable
    `includeNestedSubqueries` - true if any Subquery objects within other Subquery objects should be included, or false if only the top-level Subquery objects should be included
  Returns:
    the collection of subqueries; never null but possibly empty if no subqueries were found

### getSelectorNamesByAlias

    public static Map<SelectorName,SelectorName> getSelectorNamesByAlias(Visitable visitable)

  Get a map of the selector names keyed by their aliases.

  Parameters:
    `visitable` - the object to be visited
  Returns:
    the map from the aliases to the aliased selector name; never null but possibly empty

### getSelectorAliasesByName

    public static Map<SelectorName,SelectorName> getSelectorAliasesByName(Visitable visitable)

  Get a map of the selector aliases keyed by their names.

  Parameters:
    `visitable` - the object to be visited
  Returns:
    the map from the selector names to their alias (or name if there is no alias); never null but possibly empty

### getSelectorsReferencedBy

    public static Set<SelectorName> getSelectorsReferencedBy(Visitable visitable)

  Get the names of the selectors referenced by the visitable object.

  Parameters:
    `visitable` - the object to be visited
  Returns:
    the set of selector names referenced in some way by the visitable; never null

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