org.springframework.context.expression

## 类 MapAccessor

- java.lang.Object
- - org.springframework.context.expression.MapAccessor

- 所有已实现的接口:
    org.springframework.asm.Opcodes, org.springframework.expression.PropertyAccessor, org.springframework.expression.spel.CompilablePropertyAccessor

      public class MapAccessor
      extends Object
      implements org.springframework.expression.spel.CompilablePropertyAccessor

  EL property accessor that knows how to traverse the keys of a standard `Map`.
  从以下版本开始:
    3.0
  作者:
    Juergen Hoeller, Andy Clement

- - ### 字段概要

    - ### 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`

  - ### 构造器概要

    构造器
    构造器和说明
    `MapAccessor()`

  - ### 方法概要

    所有方法 实例方法 具体方法
    限定符和类型 | 方法和说明
    --- | ---
    `boolean` | `canRead(org.springframework.expression.EvaluationContext context, Object target, String name)`
    `boolean` | `canWrite(org.springframework.expression.EvaluationContext context, Object target, String name)`
    `void` | `generateCode(String propertyName, org.springframework.asm.MethodVisitor mv, org.springframework.expression.spel.CodeFlow cf)`
    `Class<?>` | `getPropertyType()`
    `Class<?>[]` | `getSpecificTargetClasses()`
    `boolean` | `isCompilable()`
    `org.springframework.expression.TypedValue` | `read(org.springframework.expression.EvaluationContext context, Object target, String name)`
    `void` | `write(org.springframework.expression.EvaluationContext context, Object target, String name, Object newValue)`

    - ### 从类继承的方法 java.lang.Object

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

- - ### 构造器详细资料

    - #### MapAccessor

          public MapAccessor()

  - ### 方法详细资料

    - #### getSpecificTargetClasses

          public Class<?>[] getSpecificTargetClasses()

      指定者:
        `getSpecificTargetClasses` 在接口中 `org.springframework.expression.PropertyAccessor`

    - #### canRead

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

      指定者:
        `canRead` 在接口中 `org.springframework.expression.PropertyAccessor`
      抛出:
        `org.springframework.expression.AccessException`

    - #### read

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

      指定者:
        `read` 在接口中 `org.springframework.expression.PropertyAccessor`
      抛出:
        `org.springframework.expression.AccessException`

    - #### canWrite

          public boolean canWrite(org.springframework.expression.EvaluationContext context,
                                  @Nullable
                                  Object target,
                                  String name)
                           throws org.springframework.expression.AccessException

      指定者:
        `canWrite` 在接口中 `org.springframework.expression.PropertyAccessor`
      抛出:
        `org.springframework.expression.AccessException`

    - #### write

          public void write(org.springframework.expression.EvaluationContext context,
                            @Nullable
                            Object target,
                            String name,
                            @Nullable
                            Object newValue)
                     throws org.springframework.expression.AccessException

      指定者:
        `write` 在接口中 `org.springframework.expression.PropertyAccessor`
      抛出:
        `org.springframework.expression.AccessException`

    - #### isCompilable

          public boolean isCompilable()

      指定者:
        `isCompilable` 在接口中 `org.springframework.expression.spel.CompilablePropertyAccessor`

    - #### getPropertyType

          public Class<?> getPropertyType()

      指定者:
        `getPropertyType` 在接口中 `org.springframework.expression.spel.CompilablePropertyAccessor`

    - #### generateCode

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

      指定者:
        `generateCode` 在接口中 `org.springframework.expression.spel.CompilablePropertyAccessor`