org.base.apps.beans.util
Class Evaluator

java.lang.Object
  org.base.apps.beans.util.Evaluator

All Implemented Interfaces:

BeanContainer<Object>

public class Evaluator
extends Object
implements BeanContainer<Object>

A utility to evaluate an Expr against a bean. This class is used to filter rows in or add dynamic columns to a BoundTable.

Author:

Kevan Simpson

Field Summary

JXPathContext

mCtx

Constructor Summary

	Evaluator()
protected	Evaluator(Object bean) Constructs an Expr visitor.

Method Summary

boolean	assignValue(CharSequence expr, Object value)
boolean	assignValue(CharSequence expr, Object value, Object bean)
void	compileExpr(CharSequence expr)
static Object	eval(Object bean, Expr expr) Evaluates an Expr against a bean.
Object	evaluate(Expr expr) Evaluates the given Expr.
Object	evaluate(Expr expr, Object bean) Evaluates the given Expr.
Object	getBean() Returns this container's data bean, which may be null.
protected Map<String,CompiledExpression>	getCompiledExprCache()
protected JXPathContext	getCtx()
protected static org.apache.commons.logging.Log	log()
void	setBean(Object bean) Sets this container's data bean.
protected void	setCompiledExprCache(Map<String,CompiledExpression> compiledExprCache)
protected void	setCtx(JXPathContext ctx)

Methods inherited from class java.lang.Object

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

Field Detail

mCtx

public JXPathContext mCtx

Constructor Detail

Evaluator

public Evaluator()

Evaluator

protected Evaluator(Object bean)

Constructs an Expr visitor.

Parameters:

bean - The bean to evaluate.

Method Detail

eval

public static Object eval(Object bean,
                          Expr expr)

Evaluates an Expr against a bean.

Parameters:

bean - A bean object.

expr - An Expr.

Returns:

true if the bean's properties match the Expr.

evaluate

public Object evaluate(Expr expr)

Evaluates the given Expr.

Parameters:

expr - The given Expr.

Returns:

The result of applying the Expr against a bean.

evaluate

public Object evaluate(Expr expr,
                       Object bean)

Evaluates the given Expr.

Parameters:

expr - The given Expr.

Returns:

The result of applying the Expr against a bean.

assignValue

public boolean assignValue(CharSequence expr,
                           Object value)

assignValue

public boolean assignValue(CharSequence expr,
                           Object value,
                           Object bean)

getBean

public Object getBean()

Description copied from interface: BeanContainer

Returns this container's data bean, which may be null.

Specified by:

getBean in interface BeanContainer<Object>

Returns:

this container's data bean or null.

See Also:

BeanContainer.getBean()

setBean

public void setBean(Object bean)

Description copied from interface: BeanContainer

Sets this container's data bean.

Specified by:

setBean in interface BeanContainer<Object>

Parameters:

bean - this container's data bean.

See Also:

BeanContainer.setBean(java.lang.Object)

compileExpr

public void compileExpr(CharSequence expr)

getCtx

protected JXPathContext getCtx()

Returns:

the ctx

setCtx

protected void setCtx(JXPathContext ctx)

Parameters:

ctx - the ctx to set

getCompiledExprCache

protected Map<String,CompiledExpression> getCompiledExprCache()

Returns:

the compiledExprCache

setCompiledExprCache

protected void setCompiledExprCache(Map<String,CompiledExpression> compiledExprCache)

Parameters:

compiledExprCache - the compiledExprCache to set

log

protected static org.apache.commons.logging.Log log()