org.activiti.engine.impl.juel

Class Tree

java.lang.Object

org.activiti.engine.impl.juel.Tree

public class Tree
extends Object

Parsed expression, usually created by a TreeBuilder. The bind(FunctionMapper, VariableMapper) method is used to create Bindings, which are needed at evaluation time to lookup functions and variables. The tree itself does not contain such information, because it would make the tree depend on the function/variable mapper supplied at parse time.

Author:

Christoph Beck

Constructor Summary

Constructors

Constructor and Description
Tree(ExpressionNode root, Collection<FunctionNode> functions, Collection<IdentifierNode> identifiers, boolean deferred) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
Bindings	bind(FunctionMapper fnMapper, VariableMapper varMapper) Create a bindings.
Bindings	bind(FunctionMapper fnMapper, VariableMapper varMapper, TypeConverter converter) Create a bindings.
Iterable<FunctionNode>	getFunctionNodes() Get function nodes (in no particular order)
Iterable<IdentifierNode>	getIdentifierNodes() Get identifier nodes (in no particular order)
ExpressionNode	getRoot()
boolean	isDeferred()
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Tree

public Tree(ExpressionNode root,
    Collection<FunctionNode> functions,
    Collection<IdentifierNode> identifiers,
    boolean deferred)

Constructor.

Parameters:

root - root node

functions - collection of function nodes

identifiers - collection of identifier nodes

Method Detail

getFunctionNodes

public Iterable<FunctionNode> getFunctionNodes()

Get function nodes (in no particular order)

getIdentifierNodes

public Iterable<IdentifierNode> getIdentifierNodes()

Get identifier nodes (in no particular order)

getRoot

public ExpressionNode getRoot()

Returns:

root node

isDeferred

public boolean isDeferred()

toString

public String toString()

Overrides:

toString in class Object

bind

public Bindings bind(FunctionMapper fnMapper,
            VariableMapper varMapper)

Create a bindings.

Parameters:

fnMapper - the function mapper to use

varMapper - the variable mapper to use

Returns:

tree bindings

bind

public Bindings bind(FunctionMapper fnMapper,
            VariableMapper varMapper,
            TypeConverter converter)

Create a bindings.

Parameters:

fnMapper - the function mapper to use

varMapper - the variable mapper to use

converter - custom type converter

Returns:

tree bindings