Class ReflectivePropertyAccessor.OptimalPropertyAccessor
java.lang.Object
org.springframework.expression.spel.support.ReflectivePropertyAccessor.OptimalPropertyAccessor
- All Implemented Interfaces:
Opcodes
,PropertyAccessor
,CompilablePropertyAccessor
- Enclosing class:
- 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.
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Field Summary
Fields inherited from interface 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_RECORD, 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, ASM10_EXPERIMENTAL, ASM4, ASM5, ASM6, ASM7, ASM8, ASM9, 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, SOURCE_DEPRECATED, SOURCE_MASK, SWAP, T_BOOLEAN, T_BYTE, T_CHAR, T_DOUBLE, T_FLOAT, T_INT, T_LONG, T_SHORT, TABLESWITCH, TOP, UNINITIALIZED_THIS, V_PREVIEW, V1_1, V1_2, V1_3, V1_4, V1_5, V1_6, V1_7, V1_8, V10, V11, V12, V13, V14, V15, V16, V17, V18, V19, V20, V21, V22, V23, V9
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Method Summary
Modifier and TypeMethodDescriptionboolean
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, MethodVisitor mv, CodeFlow cf) Generate the bytecode the performs the access operation into the specifiedMethodVisitor
using context information from theCodeFlow
where necessary.Class<?>
Return the type of the accessed property - may only be known once an access has occurred.Class<?>[]
Return an array of classes for which this resolver should be called.boolean
Returntrue
if this property accessor is currently suitable for compilation.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.
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Field Details
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member
The member being accessed.
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Method Details
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getSpecificTargetClasses
Description copied from interface: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.- Specified by:
getSpecificTargetClasses
in interfacePropertyAccessor
- Returns:
- an array of classes that this resolver is suitable for
(or
null
if a general resolver)
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canRead
public boolean canRead(EvaluationContext context, @Nullable Object target, String name) throws AccessException Description copied from interface:PropertyAccessor
Called to determine if a resolver instance is able to access a specified property on a specified target object.- Specified by:
canRead
in interfacePropertyAccessor
- Parameters:
context
- the evaluation context in which the access is being attemptedtarget
- the target object upon which the property is being accessedname
- the name of the property being accessed- Returns:
- true if this resolver is able to read the property
- Throws:
AccessException
- if there is any problem determining whether the property can be read
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read
public TypedValue read(EvaluationContext context, @Nullable Object target, String name) throws AccessException Description copied from interface:PropertyAccessor
Called to read a property from a specified target object. Should only succeed ifPropertyAccessor.canRead(org.springframework.expression.EvaluationContext, java.lang.Object, java.lang.String)
also returnstrue
.- Specified by:
read
in interfacePropertyAccessor
- Parameters:
context
- the evaluation context in which the access is being attemptedtarget
- the target object upon which the property is being accessedname
- the name of the property being accessed- Returns:
- a TypedValue object wrapping the property value read and a type descriptor for it
- Throws:
AccessException
- if there is any problem accessing the property value
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canWrite
Description copied from interface:PropertyAccessor
Called to determine if a resolver instance is able to write to a specified property on a specified target object.- Specified by:
canWrite
in interfacePropertyAccessor
- Parameters:
context
- the evaluation context in which the access is being attemptedtarget
- the target object upon which the property is being accessedname
- the name of the property being accessed- Returns:
- true if this resolver is able to write to the property
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write
public void write(EvaluationContext context, @Nullable Object target, String name, @Nullable Object newValue) Description copied from interface:PropertyAccessor
Called to write to a property on a specified target object. Should only succeed ifPropertyAccessor.canWrite(org.springframework.expression.EvaluationContext, java.lang.Object, java.lang.String)
also returnstrue
.- Specified by:
write
in interfacePropertyAccessor
- Parameters:
context
- the evaluation context in which the access is being attemptedtarget
- the target object upon which the property is being accessedname
- the name of the property being accessednewValue
- the new value for the property
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isCompilable
public boolean isCompilable()Description copied from interface:CompilablePropertyAccessor
Returntrue
if this property accessor is currently suitable for compilation.- Specified by:
isCompilable
in interfaceCompilablePropertyAccessor
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getPropertyType
Description copied from interface:CompilablePropertyAccessor
Return the type of the accessed property - may only be known once an access has occurred.- Specified by:
getPropertyType
in interfaceCompilablePropertyAccessor
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generateCode
Description copied from interface:CompilablePropertyAccessor
Generate the bytecode the performs the access operation into the specifiedMethodVisitor
using context information from theCodeFlow
where necessary.- Specified by:
generateCode
in interfaceCompilablePropertyAccessor
- Parameters:
propertyName
- the name of the propertymv
- the ASM method visitor into which code should be generatedcf
- the current state of the expression compiler
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