org.josql.utils

类 ExpressionEvaluator

java.lang.Object

org.josql.utils.ExpressionEvaluator

public class ExpressionEvaluator
extends Object

构造器概要

构造器

构造器和说明
ExpressionEvaluator(String exp, Class cl) Create a new expression evaluator.
ExpressionEvaluator(String exp, Class cl, List fhs) Create a new expression evaluator.

方法概要

限定符和类型	方法和说明
Query	getQuery() Get the query associated with the expression, use this to setup bind variables, function handlers and so on, which of course must be setup prior to evaluating the expression.
Object	getValue(Object o) Evaluate the expression against the object passed in and return the value.
static Object	getValue(String exp, Object o) Evaluate the expression against the object passed in and return the value.
List	getValues(List l) Evaluate the expression against the list of objects passed in and return the value.
static List	getValues(String exp, List l) Evaluate the expression against the list of objects passed in and return the value.
boolean	isTrue(Object o) Evaluate the expression against the object passed in.
static boolean	isTrue(String exp, Object o) Evaluate the expression against the object passed in.

从类继承的方法 java.lang.Object

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

构造器详细资料

ExpressionEvaluator

public ExpressionEvaluator(String exp,
                           Class cl)
                    throws QueryParseException

Create a new expression evaluator.

参数:

exp - The expression to be evaluated.

cl - The class of the object(s) that the expression will be evaluated against.

抛出:

QueryParseException - If the expression cannot be parsed.

ExpressionEvaluator

public ExpressionEvaluator(String exp,
                           Class cl,
                           List fhs)
                    throws QueryParseException

Create a new expression evaluator.

参数:

exp - The expression to be evaluated.

cl - The class of the object(s) that the expression will be evaluated against.

fhs - A list of function handlers that contain functions that will be used by the expression, can be null.

抛出:

QueryParseException - If the expression cannot be parsed.

方法详细资料

getQuery

public Query getQuery()

Get the query associated with the expression, use this to setup bind variables, function handlers and so on, which of course must be setup prior to evaluating the expression.

返回:

The Query object.

isTrue

public boolean isTrue(Object o)
               throws QueryExecutionException

Evaluate the expression against the object passed in.

参数:

o - The object to evaluate the expression against.

返回:

The value of calling Expression.isTrue (Query, Object).

抛出:

QueryExecutionException - If the expression cannot be executed.

getValues

public List getValues(List l)
               throws QueryExecutionException

Evaluate the expression against the list of objects passed in and return the value.

参数:

l - The list of objects to evaluate the expression against.

返回:

The values gained when evaluating the expression against all the objects in the list.

抛出:

QueryExecutionException - If the expression cannot be executed.

getValue

public Object getValue(Object o)
                throws QueryExecutionException

Evaluate the expression against the object passed in and return the value.

参数:

o - The object to evaluate the expression against.

返回:

The value gained when evaluating the expression against the object.

抛出:

QueryExecutionException - If the expression cannot be executed.

isTrue

public static boolean isTrue(String exp,
                             Object o)
                      throws QueryParseException,
                             QueryExecutionException

Evaluate the expression against the object passed in.

参数:

exp - A string representation of the expression to evaluate.

o - The object to evaluate the expression against.

返回:

The value of calling Expression.isTrue (Query, Object).

抛出:

QueryParseException - If the expression cannot be parsed.

QueryExecutionException - If the expression cannot be executed.

getValues

public static List getValues(String exp,
                             List l)
                      throws QueryParseException,
                             QueryExecutionException

Evaluate the expression against the list of objects passed in and return the value.

参数:

exp - A string representation of the expression to evaluate.

l - The list of objects to evaluate the expression against.

返回:

The values gained when evaluating the expression against all the objects in the list.

抛出:

QueryParseException - If the expression cannot be parsed.

QueryExecutionException - If the expression cannot be executed.

getValue

public static Object getValue(String exp,
                              Object o)
                       throws QueryParseException,
                              QueryExecutionException

Evaluate the expression against the object passed in and return the value.

参数:

exp - A string representation of the expression to evaluate.

o - The object to evaluate the expression against.

返回:

The value gained when evaluating the expression against the object.

抛出:

QueryParseException - If the expression cannot be parsed.

QueryExecutionException - If the expression cannot be executed.