java.lang.Object
- org.springframework.expression.spel.ast.SpelNodeImpl
- - org.springframework.expression.spel.ast.Indexer

所有已实现的接口:
Opcodes, SpelNode
```
public class Indexer
extends SpelNodeImpl
```
An Indexer can index into some proceeding structure to access a particular piece of it. Supported structures are: strings / collections (lists/sets) / arrays.
从以下版本开始:
3.0
作者:
Andy Clement, Phillip Webb, Stephane Nicoll

字段概要
- 从类继承的字段 org.springframework.expression.spel.ast.SpelNodeImpl
  children, exitTypeDescriptor, pos
- 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
构造器说明
Indexer(int pos, SpelNodeImpl expr)

方法概要

所有方法实例方法具体方法
修饰符和类型	方法	说明
`void`	`generateCode(MethodVisitor mv, CodeFlow cf)`	Generate the bytecode for this node into the supplied visitor.
`TypedValue`	`getValueInternal(ExpressionState state)`
`protected ValueRef`	`getValueRef(ExpressionState state)`
`boolean`	`isCompilable()`	Check whether a node can be compiled to bytecode.
`boolean`	`isWritable(ExpressionState expressionState)`	Determine if this expression node will support a setValue() call.
`void`	`setValue(ExpressionState state, Object newValue)`	Evaluate the expression to a node and then set the new value on that node.
`String`	`toStringAST()`

从类继承的方法 org.springframework.expression.spel.ast.SpelNodeImpl
generateCodeForArgument, generateCodeForArguments, getChild, getChildCount, getEndPosition, getExitDescriptor, getObjectClass, getPreviousChild, getStartPosition, getTypedValue, getValue, getValue, nextChildIs

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
  - Indexer
```
public Indexer(int pos,
               SpelNodeImpl expr)
```
- 方法详细资料
  - getValueInternal
```
public TypedValue getValueInternal(ExpressionState state)
                            throws EvaluationException
```
    指定者:
    getValueInternal 在类中 SpelNodeImpl
    抛出:
    EvaluationException
  - setValue
```
public void setValue(ExpressionState state,
                     Object newValue)
              throws EvaluationException
```
    从接口复制的说明: SpelNode
    Evaluate the expression to a node and then set the new value on that node. For example, if the expression evaluates to a property reference, then the property will be set to the new value.
    指定者:
    setValue 在接口中 SpelNode
    覆盖:
    setValue 在类中 SpelNodeImpl
    参数:
    state - the current expression state (includes the context)
    newValue - the new value
    抛出:
    EvaluationException - if any problem occurs evaluating the expression or setting the new value
  - isWritable
```
public boolean isWritable(ExpressionState expressionState)
                   throws SpelEvaluationException
```
    从接口复制的说明: SpelNode
    Determine if this expression node will support a setValue() call.
    指定者:
    isWritable 在接口中 SpelNode
    覆盖:
    isWritable 在类中 SpelNodeImpl
    参数:
    expressionState - the current expression state (includes the context)
    返回:
    true if the expression node will allow setValue()
    抛出:
    SpelEvaluationException
  - getValueRef
```
protected ValueRef getValueRef(ExpressionState state)
                        throws EvaluationException
```
    覆盖:
    getValueRef 在类中 SpelNodeImpl
    抛出:
    EvaluationException
  - isCompilable
```
public boolean isCompilable()
```
    从类复制的说明: SpelNodeImpl
    Check whether a node can be compiled to bytecode. The reasoning in each node may be different but will typically involve checking whether the exit type descriptor of the node is known and any relevant child nodes are compilable.
    覆盖:
    isCompilable 在类中 SpelNodeImpl
    返回:
    true if this node can be compiled to bytecode
  - generateCode
```
public void generateCode(MethodVisitor mv,
                         CodeFlow cf)
```
    从类复制的说明: SpelNodeImpl
    Generate the bytecode for this node into the supplied visitor. Context info about the current expression being compiled is available in the codeflow object. For example it will include information about the type of the object currently on the stack.
    覆盖:
    generateCode 在类中 SpelNodeImpl
    参数:
    mv - the ASM MethodVisitor into which code should be generated
    cf - a context object with info about what is on the stack
  - toStringAST
```
public String toStringAST()
```
    返回:
    the string form of this AST node

类 Indexer

字段概要

从类继承的字段 org.springframework.expression.spel.ast.SpelNodeImpl

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

构造器概要

方法概要

从类继承的方法 org.springframework.expression.spel.ast.SpelNodeImpl

从类继承的方法 java.lang.Object

构造器详细资料

Indexer

方法详细资料

getValueInternal

setValue

isWritable

getValueRef

isCompilable

generateCode

toStringAST