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## net.sf.saxon.om
Class TreeModel

    java.lang.Object
      net.sf.saxon.om.TreeModel

All Implemented Interfaces:
  Serializable

Direct Known Subclasses:
  DOM4JObjectModel, JDOMObjectModel, XOMObjectModel

    public abstract class TreeModel

extends Object
implements Serializable

A TreeModel represents an implementation of the Saxon NodeInfo interface, which itself is essentially an implementation of the XDM model defined in W3C specifications (except that Saxon's NodeInfo understands the 13 XPath axes, rather than merely supporting parent and child properties).

This class serves two purposes: it acts as a factory for obtaining a Builder which can be used to build trees using this tree model; and it provides static constants that can be used to identify the built-in tree models.

See Also:
  Serialized Form

Field Summary
`static TreeModel` | `LINKED_TREE` The LinkedTree.
`static TreeModel` | `TINY_TREE` The TinyTree implementation.
`static TreeModel` | `TINY_TREE_CONDENSED` The CondensedTinyTree implementation.

Constructor Summary
`TreeModel()`

Method Summary
`int` | `getSymbolicValue()` Get the integer constant used to identify this tree model in some legacy interfaces
`static TreeModel` | `getTreeModel(int symbolicValue)` Get the tree model corresponding to a given integer constant
`boolean` | `isMutable()` Ask whether this tree model supports updating (that is, whether the nodes in the constructed tree will implement `MutableNodeInfo`, which is necessary if they are to support XQuery Update.
`abstract Builder` | `makeBuilder(PipelineConfiguration pipe)` Make a Builder to construct an instance of this tree model from a stream of events

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

Field Detail

### TINY_TREE

    public static final TreeModel TINY_TREE

  The TinyTree implementation. This is normally the default implementation of the tree model.

### TINY_TREE_CONDENSED

    public static final TreeModel TINY_TREE_CONDENSED

  The CondensedTinyTree implementation. This is a variant of the TinyTree that uses less memory but takes a little longer to build. Run-time performance is the same as the TinyTree.

### LINKED_TREE

    public static final TreeModel LINKED_TREE

  The LinkedTree. This takes more memory than the TinyTree. The main advantage of this model is that it is updateable: the nodes in a LinkedTree can be modified using XQuery Updates.

Constructor Detail

### TreeModel

    public TreeModel()

Method Detail

### makeBuilder

    public abstract Builder makeBuilder(PipelineConfiguration pipe)

  Make a Builder to construct an instance of this tree model from a stream of events

  Returns:
    a newly created Builder @param pipe

### getSymbolicValue

    public int getSymbolicValue()

  Get the integer constant used to identify this tree model in some legacy interfaces

  Returns:
    an integer constant used to identify the model, for example `Builder.TINY_TREE`

### getTreeModel

    public static TreeModel getTreeModel(int symbolicValue)

  Get the tree model corresponding to a given integer constant

  Parameters:
    `symbolicValue` - one of the constants `Builder.TINY_TREE`, `Builder.TINY_TREE_CONDENSED`, or `Builder.LINKED_TREE`
  Returns:
    the corresponding TreeModel

### isMutable

    public boolean isMutable()

  Ask whether this tree model supports updating (that is, whether the nodes in the constructed tree will implement `MutableNodeInfo`, which is necessary if they are to support XQuery Update. This method can be overridden in subclasses; the default implementation returns false.

  Returns:
    true if the tree model implementation supports updating, that is, if its nodes support the MutableNodeInfo interface.

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Copyright (c) 2004-2010 Saxonica Limited. All rights reserved.