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.

Field Summary
Fields
Modifier and Type Field Description
Member member
The member being accessed.
- 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_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

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`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, 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.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - member
```
public final Member member
```
    The member being accessed.
- Method Detail
  - getSpecificTargetClasses
```
public Class<?>[] 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 interface PropertyAccessor
    Returns:
    an array of classes that this resolver is suitable for (or null if a general resolver)
  - canRead
```
public boolean canRead(EvaluationContext context,
                       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 interface PropertyAccessor
    Parameters:
    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
    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
  - read
```
public TypedValue read(EvaluationContext context,
                       Object target,
                       String name)
                throws AccessException
```
    Description copied from interface: 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.
    Specified by:
    read in interface PropertyAccessor
    Parameters:
    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
    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
  - canWrite
```
public boolean canWrite(EvaluationContext context,
                        Object target,
                        String name)
```
    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 interface PropertyAccessor
    Parameters:
    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
    Returns:
    true if this resolver is able to write to the property
  - write
```
public void write(EvaluationContext context,
                  Object target,
                  String name,
                  Object newValue)
```
    Description copied from interface: 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.
    Specified by:
    write in interface PropertyAccessor
    Parameters:
    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()
```
    Description copied from interface: CompilablePropertyAccessor
    Return true if this property accessor is currently suitable for compilation.
    Specified by:
    isCompilable in interface CompilablePropertyAccessor
  - getPropertyType
```
public Class<?> 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 interface CompilablePropertyAccessor
  - generateCode
```
public void generateCode(String propertyName,
                         MethodVisitor mv,
                         CodeFlow cf)
```
    Description copied from interface: CompilablePropertyAccessor
    Generate the bytecode the performs the access operation into the specified MethodVisitor using context information from the codeflow where necessary.
    Specified by:
    generateCode in interface CompilablePropertyAccessor
    Parameters:
    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

Class ReflectivePropertyAccessor.OptimalPropertyAccessor

Field Summary

Fields inherited from interface org.springframework.asm.Opcodes

Method Summary

Methods inherited from class java.lang.Object

Field Detail

member

Method Detail

getSpecificTargetClasses

canRead

read

canWrite

write

isCompilable

getPropertyType

generateCode