ExpressionCompiler (DataNucleus Core 6.0.1-SNAPSHOT API)

java.lang.Object
- org.datanucleus.store.query.expression.ExpressionCompiler

```
public class ExpressionCompiler
extends Object
```
Compiler for expressions. Responsible for taking a Node tree and creating an Expression tree.

Constructor Summary

Constructors
Constructor Description

ExpressionCompiler()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Expression`	`compileExpression(Node node)`	Primary entry point for compiling a node for the filter, grouping, having, result clauses.
`Expression`	`compileFromExpression(Node node, boolean classIsExpression)`	Primary entry point for compiling a node for the from clause.
`Expression`	`compileOrderExpression(Node node)`	Primary entry point for compiling a node for the order clause.
`void`	`setMethodAliases(Map<String,String> aliasByPrefix)`
`void`	`setSymbolTable(SymbolTable symtbl)`

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

- Constructor Detail
  - ExpressionCompiler
```
public ExpressionCompiler()
```
- Method Detail
  - setMethodAliases
```
public void setMethodAliases(Map<String,String> aliasByPrefix)
```
  - setSymbolTable
```
public void setSymbolTable(SymbolTable symtbl)
```
  - compileOrderExpression
```
public Expression compileOrderExpression(Node node)
```
    Primary entry point for compiling a node for the order clause.
    
    Parameters:
    
    node - The node
    
    Returns:
    
    Its compiled expression
  - compileFromExpression
```
public Expression compileFromExpression(Node node,
                                        boolean classIsExpression)
```
    Primary entry point for compiling a node for the from clause.
    
    Parameters:
    
    node - The node
    
    classIsExpression - whether the class of the from node is an expression relating to the outer query
    
    Returns:
    
    Its compiled expression
  - compileExpression
```
public Expression compileExpression(Node node)
```
    Primary entry point for compiling a node for the filter, grouping, having, result clauses.
    
    Parameters:
    
    node - The node
    
    Returns:
    
    Its compiled expression