ExpressionTypeFinder

java.lang.Object
- org.vedantatree.expressionoasis.expressions.ExpressionTypeFinder

All Implemented Interfaces:

ExpressionVisitor
```
public class ExpressionTypeFinder
extends Object
implements ExpressionVisitor
```
Use to find sub-expressions of a particular type within a given expression. For example, the following would extract a set of variables (IdentifierExpressions) from an expression: ExpressionTypeFinder finder = new ExpressionTypeFinder(someExpression, IdentifierExpression.class); Set variables = finder.getExpressions();

Constructor Summary

Constructors
Constructor Description

ExpressionTypeFinder(Expression expressionToSearch, Class expressionTypeToFind)
Creates a new ExpressionTypeFinder

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`LinkedHashSet<Expression>`	`getExpressions()`	Gets a set of subexpressions of a given type
`void`	`visit(Expression expression)`	Implementation of the visitor design pattern.

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

- Constructor Detail
  - ExpressionTypeFinder
```
public ExpressionTypeFinder(Expression expressionToSearch,
                            Class expressionTypeToFind)
```
    Creates a new ExpressionTypeFinder
    
    Parameters:
    
    expressionToSearch - the expression to search to find sub-expressions
    
    expressionTypeToFind - the type of the sub-expressions to search
- Method Detail
  - visit
```
public void visit(Expression expression)
```
    Implementation of the visitor design pattern. An expression will call this with itself as the expression parameter.
    
    Specified by:
    
    visit in interface ExpressionVisitor
    
    Parameters:
    
    expression -
  - getExpressions
```
public LinkedHashSet<Expression> getExpressions()
```
    Gets a set of subexpressions of a given type
    
    Returns:
    
    a set of expressions of type expressionTypeToFind contained within expressionToSearch