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Java Standard Edition (SE)

TreeVisitor


com.sun.source.tree

Interface TreeVisitor<R,P>

  • Type Parameters:
    R - the return type of this visitor's methods. Use Void for visitors that do not need to return results.
    P - the type of the additional parameter to this visitor's methods. Use Void for visitors that do not need an additional parameter.
    All Known Implementing Classes:
    SimpleTreeVisitor, TreePathScanner, TreeScanner


    @Exported
    public interface TreeVisitor<R,P>
    A visitor of trees, in the style of the visitor design pattern. Classes implementing this interface are used to operate on a tree when the kind of tree is unknown at compile time. When a visitor is passed to an tree's accept method, the visitXYZ method most applicable to that tree is invoked.

    Classes implementing this interface may or may not throw a NullPointerException if the additional parameter p is null; see documentation of the implementing class for details.

    WARNING: It is possible that methods will be added to this interface to accommodate new, currently unknown, language structures added to future versions of the Java™ programming language. Therefore, visitor classes directly implementing this interface may be source incompatible with future versions of the platform.

    Since:
    1.6


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