org.springframework.expression.spel.support

类 ReflectivePropertyAccessor.OptimalPropertyAccessor

java.lang.Object

org.springframework.expression.spel.support.ReflectivePropertyAccessor.OptimalPropertyAccessor

所有已实现的接口:

org.springframework.asm.Opcodes, PropertyAccessor, CompilablePropertyAccessor

封闭类:

ReflectivePropertyAccessor

public static class ReflectivePropertyAccessor.OptimalPropertyAccessor
extends Object
implements CompilablePropertyAccessor

An optimized form of a PropertyAccessor that will use reflection but only knows how to access a particular property on a particular class. This is unlike the general ReflectivePropertyResolver which manages a cache of methods/fields that may be invoked to access different properties on different classes. This optimal accessor exists because looking up the appropriate reflective object by class/name on each read is not cheap.

字段概要

字段

限定符和类型	字段和说明
Member	member

从接口继承的字段 org.springframework.asm.Opcodes

AALOAD, AASTORE, ACC_ABSTRACT, ACC_ANNOTATION, ACC_BRIDGE, ACC_DEPRECATED, ACC_ENUM, ACC_FINAL, ACC_INTERFACE, ACC_MANDATED, ACC_MODULE, ACC_NATIVE, ACC_OPEN, ACC_PRIVATE, ACC_PROTECTED, ACC_PUBLIC, ACC_STATIC, ACC_STATIC_PHASE, ACC_STRICT, ACC_SUPER, ACC_SYNCHRONIZED, ACC_SYNTHETIC, ACC_TRANSIENT, ACC_TRANSITIVE, ACC_VARARGS, ACC_VOLATILE, ACONST_NULL, ALOAD, ANEWARRAY, ARETURN, ARRAYLENGTH, ASM4, ASM5, ASM6, ASTORE, ATHROW, BALOAD, BASTORE, BIPUSH, CALOAD, CASTORE, CHECKCAST, D2F, D2I, D2L, DADD, DALOAD, DASTORE, DCMPG, DCMPL, DCONST_0, DCONST_1, DDIV, DLOAD, DMUL, DNEG, DOUBLE, DREM, DRETURN, DSTORE, DSUB, DUP, DUP_X1, DUP_X2, DUP2, DUP2_X1, DUP2_X2, F_APPEND, F_CHOP, F_FULL, F_NEW, F_SAME, F_SAME1, F2D, F2I, F2L, FADD, FALOAD, FASTORE, FCMPG, FCMPL, FCONST_0, FCONST_1, FCONST_2, FDIV, FLOAD, FLOAT, FMUL, FNEG, FREM, FRETURN, FSTORE, FSUB, GETFIELD, GETSTATIC, GOTO, H_GETFIELD, H_GETSTATIC, H_INVOKEINTERFACE, H_INVOKESPECIAL, H_INVOKESTATIC, H_INVOKEVIRTUAL, H_NEWINVOKESPECIAL, H_PUTFIELD, H_PUTSTATIC, I2B, I2C, I2D, I2F, I2L, I2S, IADD, IALOAD, IAND, IASTORE, ICONST_0, ICONST_1, ICONST_2, ICONST_3, ICONST_4, ICONST_5, ICONST_M1, IDIV, IF_ACMPEQ, IF_ACMPNE, IF_ICMPEQ, IF_ICMPGE, IF_ICMPGT, IF_ICMPLE, IF_ICMPLT, IF_ICMPNE, IFEQ, IFGE, IFGT, IFLE, IFLT, IFNE, IFNONNULL, IFNULL, IINC, ILOAD, IMUL, INEG, INSTANCEOF, INTEGER, INVOKEDYNAMIC, INVOKEINTERFACE, INVOKESPECIAL, INVOKESTATIC, INVOKEVIRTUAL, IOR, IREM, IRETURN, ISHL, ISHR, ISTORE, ISUB, IUSHR, IXOR, JSR, L2D, L2F, L2I, LADD, LALOAD, LAND, LASTORE, LCMP, LCONST_0, LCONST_1, LDC, LDIV, LLOAD, LMUL, LNEG, LONG, LOOKUPSWITCH, LOR, LREM, LRETURN, LSHL, LSHR, LSTORE, LSUB, LUSHR, LXOR, MONITORENTER, MONITOREXIT, MULTIANEWARRAY, NEW, NEWARRAY, NOP, NULL, POP, POP2, PUTFIELD, PUTSTATIC, RET, RETURN, SALOAD, SASTORE, SIPUSH, SWAP, T_BOOLEAN, T_BYTE, T_CHAR, T_DOUBLE, T_FLOAT, T_INT, T_LONG, T_SHORT, TABLESWITCH, TOP, UNINITIALIZED_THIS, V1_1, V1_2, V1_3, V1_4, V1_5, V1_6, V1_7, V1_8, V1_9

方法概要

限定符和类型	方法和说明
boolean	canRead(EvaluationContext context, Object target, String name) Called to determine if a resolver instance is able to access a specified property on a specified target object.
boolean	canWrite(EvaluationContext context, Object target, String name) Called to determine if a resolver instance is able to write to a specified property on a specified target object.
void	generateCode(String propertyName, org.springframework.asm.MethodVisitor mv, CodeFlow cf) Generate the bytecode the performs the access operation into the specified MethodVisitor using context information from the codeflow where necessary.
Class<?>	getPropertyType() Return the type of the accessed property - may only be known once an access has occurred.
Class<?>[]	getSpecificTargetClasses() Return an array of classes for which this resolver should be called.
boolean	isCompilable() Return true if this property accessor is currently suitable for compilation.
TypedValue	read(EvaluationContext context, Object target, String name) Called to read a property from a specified target object.
void	write(EvaluationContext context, Object target, String name, Object newValue) Called to write to a property on a specified target object.

从类继承的方法 java.lang.Object

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

字段详细资料

member

public final Member member

方法详细资料

getSpecificTargetClasses

@Nullable
public Class<?>[] getSpecificTargetClasses()

从接口复制的说明: PropertyAccessor

Return an array of classes for which this resolver should be called.

>Returning null indicates this is a general resolver that can be called in an attempt to resolve a property on any type.

指定者:

getSpecificTargetClasses 在接口中 PropertyAccessor

返回:

an array of classes that this resolver is suitable for (or null if a general resolver)

canRead

public boolean canRead(EvaluationContext context,
                       @Nullable
                       Object target,
                       String name)
                throws AccessException

从接口复制的说明: PropertyAccessor

Called to determine if a resolver instance is able to access a specified property on a specified target object.

指定者:

canRead 在接口中 PropertyAccessor

参数:

context - the evaluation context in which the access is being attempted

target - the target object upon which the property is being accessed

name - the name of the property being accessed

返回:

true if this resolver is able to read the property

抛出:

AccessException - if there is any problem determining whether the property can be read

read

public TypedValue read(EvaluationContext context,
                       @Nullable
                       Object target,
                       String name)
                throws AccessException

从接口复制的说明: PropertyAccessor

Called to read a property from a specified target object. Should only succeed if PropertyAccessor.canRead(org.springframework.expression.EvaluationContext, java.lang.Object, java.lang.String) also returns true.

指定者:

read 在接口中 PropertyAccessor

参数:

context - the evaluation context in which the access is being attempted

target - the target object upon which the property is being accessed

name - the name of the property being accessed

返回:

a TypedValue object wrapping the property value read and a type descriptor for it

抛出:

AccessException - if there is any problem accessing the property value

canWrite

public boolean canWrite(EvaluationContext context,
                        @Nullable
                        Object target,
                        String name)

从接口复制的说明: PropertyAccessor

Called to determine if a resolver instance is able to write to a specified property on a specified target object.

指定者:

canWrite 在接口中 PropertyAccessor

参数:

context - the evaluation context in which the access is being attempted

target - the target object upon which the property is being accessed

name - the name of the property being accessed

返回:

true if this resolver is able to write to the property

write

public void write(EvaluationContext context,
                  @Nullable
                  Object target,
                  String name,
                  @Nullable
                  Object newValue)

从接口复制的说明: PropertyAccessor

Called to write to a property on a specified target object. Should only succeed if PropertyAccessor.canWrite(org.springframework.expression.EvaluationContext, java.lang.Object, java.lang.String) also returns true.

指定者:

write 在接口中 PropertyAccessor

参数:

context - the evaluation context in which the access is being attempted

target - the target object upon which the property is being accessed

name - the name of the property being accessed

newValue - the new value for the property

isCompilable

public boolean isCompilable()

从接口复制的说明: CompilablePropertyAccessor

Return true if this property accessor is currently suitable for compilation.

指定者:

isCompilable 在接口中 CompilablePropertyAccessor

getPropertyType

public Class<?> getPropertyType()

从接口复制的说明: CompilablePropertyAccessor

Return the type of the accessed property - may only be known once an access has occurred.

指定者:

getPropertyType 在接口中 CompilablePropertyAccessor

generateCode

public void generateCode(String propertyName,
                         org.springframework.asm.MethodVisitor mv,
                         CodeFlow cf)

从接口复制的说明: CompilablePropertyAccessor

Generate the bytecode the performs the access operation into the specified MethodVisitor using context information from the codeflow where necessary.

指定者:

generateCode 在接口中 CompilablePropertyAccessor

参数:

propertyName - the name of the property

mv - the Asm method visitor into which code should be generated

cf - the current state of the expression compiler