Class MapAccessor
java.lang.Object
org.springframework.context.expression.MapAccessor
- All Implemented Interfaces:
Opcodes
,PropertyAccessor
,CompilablePropertyAccessor
EL property accessor that knows how to traverse the keys
of a standard
Map
.- Since:
- 3.0
- Author:
- Juergen Hoeller, Andy Clement
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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, V9
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Constructor Summary
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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 specified MethodVisitor using context information from the codeflow 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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Constructor Details
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MapAccessor
public MapAccessor()
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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
public boolean canWrite(EvaluationContext context, @Nullable Object target, String name) throws AccessException 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
- Throws:
AccessException
- if there is any problem determining whether the property can be written to
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write
public void write(EvaluationContext context, @Nullable Object target, String name, @Nullable Object newValue) throws AccessException 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- Throws:
AccessException
- if there is any problem writing to the property value
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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 specified MethodVisitor using context information from the codeflow 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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