Package com.tangosol.coherence.rest.util

Class MvelHelper

java.lang.Object

com.tangosol.coherence.rest.util.MvelHelper

public class MvelHelper
extends Object

Enable Mvel to be optional by only accessing module via reflection with implementation provided on classpath. org.mvel.mvel2 module is removed by default for security reasons, but one can override and have backwards compatible support by adding the mvel module to the path.

Since:

12.2.1.3.18

Author:

jf 2022/01/19

Field Summary

Fields

Modifier and Type	Field	Description
static MethodHandle	HANDLE_COMPILE_EXPRESSION	MethodHandle for method compileExpression(String expr, ParserContext ctx) from org.mvel2.MVEL.
static MethodHandle	HANDLE_COMPILE_SET_EXPRESSION	MethodHandle for method compileSetExpression(String expr, ParserContext ctx) from org.mvel2.MVEL.
static MethodHandle	HANDLE_EXECUTE_EXPRESSION	MethodHandle for method executeExpression(Object compiledExpr, Object ctx) from org.mvel2.MVEL.
static MethodHandle	HANDLE_EXECUTE_SET_EXPRESSION	MethodHandle for method executeSetExpression(Serializable compiledExpr, Object ctx, Object value) from org.mvel2.MVEL.
static MethodHandle	HANDLE_PARSER_CONFIGURATION_SET_CLASS_LOADER	MethodHandle for method setClassLoader() from org.mvel2.ParserConfiguration.
static MethodHandle	HANDLE_PARSER_CONTEXT_ADD_PACKAGE_IMPORT	MethodHandle for method addPackageImport(String) from org.mvel2.ParserContext.
static MethodHandle	HANDLE_PARSER_CONTEXT_GET_PARSER_CONFIGURATION	MethodHandle for method getParserConfiguration() from org.mvel2.ParserContext.
static Class<?>	s_clzMVEL	Reflection lookup of class org.mvel2.MVEL.
static Class<?>	s_clzParserContext	Reflection lookup of class org.mvel2.ParserContext.
static boolean	s_fEnabled	True iff mvel2 jar is on classpath and all reflection lookups succeeded.

Constructor Summary

Constructors

Constructor	Description
MvelHelper()

Method Summary

Modifier and Type	Method	Description
static Serializable	compileExpression(String sExpr, Object ctx)	Compile sExpr within ParserContext ctx.
static Serializable	compileSetExpression(String sExpr, Object ctx)	Compile sExpr using ParserContext ctx.
static Object	executeExpression(Object compiledExpr, Object oTarget)	Executes a compiledExpression against target.
static void	executeSetExpression(Serializable compiledSet, Object oTarget, Object oValue)	Set property referenced by compiledSet expression in oTarget to Ovalue..
static Object	getMvelParserContext()	Return an instance of ParserContext to be used for MVEL compilation.
static boolean	isEnabled()	Return true if optional org.mvel.mvel2 module is loaded from path.

Methods inherited from class java.lang.Object

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

Field Detail

s_fEnabled

public static final boolean s_fEnabled

True iff mvel2 jar is on classpath and all reflection lookups succeeded.

s_clzMVEL

public static final Class<?> s_clzMVEL

Reflection lookup of class org.mvel2.MVEL.

s_clzParserContext

public static final Class<?> s_clzParserContext

Reflection lookup of class org.mvel2.ParserContext.

HANDLE_PARSER_CONTEXT_ADD_PACKAGE_IMPORT

public static final MethodHandle HANDLE_PARSER_CONTEXT_ADD_PACKAGE_IMPORT

MethodHandle for method addPackageImport(String) from org.mvel2.ParserContext.

HANDLE_PARSER_CONTEXT_GET_PARSER_CONFIGURATION

public static final MethodHandle HANDLE_PARSER_CONTEXT_GET_PARSER_CONFIGURATION

MethodHandle for method getParserConfiguration() from org.mvel2.ParserContext.

HANDLE_PARSER_CONFIGURATION_SET_CLASS_LOADER

public static final MethodHandle HANDLE_PARSER_CONFIGURATION_SET_CLASS_LOADER

MethodHandle for method setClassLoader() from org.mvel2.ParserConfiguration.

HANDLE_COMPILE_EXPRESSION

public static final MethodHandle HANDLE_COMPILE_EXPRESSION

MethodHandle for method compileExpression(String expr, ParserContext ctx) from org.mvel2.MVEL.

HANDLE_EXECUTE_EXPRESSION

public static final MethodHandle HANDLE_EXECUTE_EXPRESSION

MethodHandle for method executeExpression(Object compiledExpr, Object ctx) from org.mvel2.MVEL.

HANDLE_COMPILE_SET_EXPRESSION

public static final MethodHandle HANDLE_COMPILE_SET_EXPRESSION

MethodHandle for method compileSetExpression(String expr, ParserContext ctx) from org.mvel2.MVEL.

HANDLE_EXECUTE_SET_EXPRESSION

public static final MethodHandle HANDLE_EXECUTE_SET_EXPRESSION

MethodHandle for method executeSetExpression(Serializable compiledExpr, Object ctx, Object value) from org.mvel2.MVEL.

Constructor Detail

MvelHelper

public MvelHelper()

Method Detail

isEnabled

public static boolean isEnabled()

Return true if optional org.mvel.mvel2 module is loaded from path. Due to security concerns, Mvel is removed from default implementation and only optionally available for backwards compatibility mode.

Returns:

true if mvel implementation is available

getMvelParserContext

public static Object getMvelParserContext()

Return an instance of ParserContext to be used for MVEL compilation.

Returns:

an instance of ParserContext to be used for MVEL compilation

compileExpression

public static Serializable compileExpression(String sExpr,
                                             Object ctx)

Compile sExpr within ParserContext ctx.

Parameters:

sExpr - expression

ctx - ParserContext

Returns:

a Serializable compiled expression

executeExpression

public static Object executeExpression(Object compiledExpr,
                                       Object oTarget)

Executes a compiledExpression against target.

Parameters:

compiledExpr - compiled expression to select data from target

oTarget - target object

Returns:

the extracted data from oTarget

compileSetExpression

public static Serializable compileSetExpression(String sExpr,
                                                Object ctx)

Compile sExpr using ParserContext ctx.

Parameters:

sExpr - expression

ctx - ParserContext

Returns:

a Serializable compiled expression

executeSetExpression

public static void executeSetExpression(Serializable compiledSet,
                                        Object oTarget,
                                        Object oValue)

Set property referenced by compiledSet expression in oTarget to Ovalue..

Parameters:

compiledSet - result of compileSetExpression(String, Object)

oTarget - object to be updated

oValue - value to update the computed property