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

所有已实现的接口:
Opcodes, SpelNode
直接已知子类:
Assign, BeanReference, CompoundExpression, ConstructorReference, Elvis, FunctionReference, Identifier, Indexer, InlineList, InlineMap, Literal, MethodReference, Operator, OperatorNot, Projection, PropertyOrFieldReference, QualifiedIdentifier, Selection, Ternary, TypeReference, VariableReference
```
public abstract class SpelNodeImpl
extends Object
implements SpelNode, Opcodes
```
The common supertype of all AST nodes in a parsed Spring Expression Language format expression.
从以下版本开始:
3.0
作者:
Andy Clement

字段概要
字段
修饰符和类型字段说明
protected SpelNodeImpl[] children
protected String exitTypeDescriptor
Indicates the type descriptor for the result of this expression node.
protected int 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
SpelNodeImpl(int pos, SpelNodeImpl... operands)

方法概要

所有方法静态方法实例方法抽象方法具体方法已过时的方法
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.
`protected static void`	`generateCodeForArgument(MethodVisitor mv, CodeFlow cf, SpelNodeImpl argument, String paramDesc)`	Ask an argument to generate its bytecode and then follow it up with any boxing/unboxing/checkcasting to ensure it matches the expected parameter descriptor.
`protected static void`	`generateCodeForArguments(MethodVisitor mv, CodeFlow cf, Member member, SpelNodeImpl[] arguments)`	Generate code that handles building the argument values for the specified method.
`SpelNode`	`getChild(int index)`	Helper method that returns a SpelNode rather than an Antlr Tree node.
`int`	`getChildCount()`
`int`	`getEndPosition()`
`String`	`getExitDescriptor()`
`Class<?>`	`getObjectClass(Object obj)`	Determine the class of the object passed in, unless it is already a class object.
`protected SpelNodeImpl`	`getPreviousChild()`	已过时。
`int`	`getStartPosition()`
`TypedValue`	`getTypedValue(ExpressionState expressionState)`	Evaluate the expression node in the context of the supplied expression state and return the typed value.
`Object`	`getValue(ExpressionState expressionState)`	Evaluate the expression node in the context of the supplied expression state and return the value.
`protected <T> T`	`getValue(ExpressionState state, Class<T> desiredReturnType)`
`abstract TypedValue`	`getValueInternal(ExpressionState expressionState)`
`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.
`protected boolean`	`nextChildIs(Class<?>... clazzes)`
`void`	`setValue(ExpressionState expressionState, Object newValue)`	Evaluate the expression to a node and then set the new value on that node.

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

从接口继承的方法 org.springframework.expression.spel.SpelNode
toStringAST

- 字段详细资料
  - pos
```
protected int pos
```
  - children
```
protected SpelNodeImpl[] children
```
  - exitTypeDescriptor
```
protected volatile String exitTypeDescriptor
```
    Indicates the type descriptor for the result of this expression node. This is set as soon as it is known. For a literal node it is known immediately. For a property access or method invocation it is known after one evaluation of that node.
    The descriptor is like the bytecode form but is slightly easier to work with. It does not include the trailing semicolon (for non array reference types). Some examples: Ljava/lang/String, I, [I
- 构造器详细资料
  - SpelNodeImpl
```
public SpelNodeImpl(int pos,
                    SpelNodeImpl... operands)
```
- 方法详细资料
  - getPreviousChild
```
@Deprecated
protected SpelNodeImpl getPreviousChild()
```
    已过时。
  - nextChildIs
```
protected boolean nextChildIs(Class<?>... clazzes)
```
    返回:
    true if the next child is one of the specified classes
  - getValue
```
public final Object getValue(ExpressionState expressionState)
                      throws EvaluationException
```
    从接口复制的说明: SpelNode
    Evaluate the expression node in the context of the supplied expression state and return the value.
    指定者:
    getValue 在接口中 SpelNode
    参数:
    expressionState - the current expression state (includes the context)
    返回:
    the value of this node evaluated against the specified state
    抛出:
    EvaluationException
  - getTypedValue
```
public final TypedValue getTypedValue(ExpressionState expressionState)
                               throws EvaluationException
```
    从接口复制的说明: SpelNode
    Evaluate the expression node in the context of the supplied expression state and return the typed value.
    指定者:
    getTypedValue 在接口中 SpelNode
    参数:
    expressionState - the current expression state (includes the context)
    返回:
    the type value of this node evaluated against the specified state
    抛出:
    EvaluationException
  - isWritable
```
public boolean isWritable(ExpressionState expressionState)
                   throws EvaluationException
```
    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
    参数:
    expressionState - the current expression state (includes the context)
    返回:
    true if the expression node will allow setValue()
    抛出:
    EvaluationException - if something went wrong trying to determine if the node supports writing
  - setValue
```
public void setValue(ExpressionState expressionState,
                     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
    参数:
    expressionState - 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
  - getChild
```
public SpelNode getChild(int index)
```
    从接口复制的说明: SpelNode
    Helper method that returns a SpelNode rather than an Antlr Tree node.
    指定者:
    getChild 在接口中 SpelNode
    返回:
    the child node cast to a SpelNode
  - getChildCount
```
public int getChildCount()
```
    指定者:
    getChildCount 在接口中 SpelNode
    返回:
    the number of children under this node
  - getObjectClass
```
public Class<?> getObjectClass(Object obj)
```
    从接口复制的说明: SpelNode
    Determine the class of the object passed in, unless it is already a class object.
    指定者:
    getObjectClass 在接口中 SpelNode
    参数:
    obj - the object that the caller wants the class of
    返回:
    the class of the object if it is not already a class object, or null if the object is null
  - getValue
```
protected final <T> T getValue(ExpressionState state,
                               Class<T> desiredReturnType)
                        throws EvaluationException
```
    抛出:
    EvaluationException
  - getStartPosition
```
public int getStartPosition()
```
    指定者:
    getStartPosition 在接口中 SpelNode
    返回:
    the start position of this Ast node in the expression string
  - getEndPosition
```
public int getEndPosition()
```
    指定者:
    getEndPosition 在接口中 SpelNode
    返回:
    the end position of this Ast node in the expression string
  - getValueRef
```
protected ValueRef getValueRef(ExpressionState state)
                        throws EvaluationException
```
    抛出:
    EvaluationException
  - isCompilable
```
public boolean isCompilable()
```
    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.
    返回:
    true if this node can be compiled to bytecode
  - generateCode
```
public void generateCode(MethodVisitor mv,
                         CodeFlow cf)
```
    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.
    参数:
    mv - the ASM MethodVisitor into which code should be generated
    cf - a context object with info about what is on the stack
  - getExitDescriptor
```
public String getExitDescriptor()
```
  - getValueInternal
```
public abstract TypedValue getValueInternal(ExpressionState expressionState)
                                     throws EvaluationException
```
    抛出:
    EvaluationException
  - generateCodeForArguments
```
protected static void generateCodeForArguments(MethodVisitor mv,
                                               CodeFlow cf,
                                               Member member,
                                               SpelNodeImpl[] arguments)
```
    Generate code that handles building the argument values for the specified method. This method will take account of whether the invoked method is a varargs method and if it is then the argument values will be appropriately packaged into an array.
    参数:
    mv - the method visitor where code should be generated
    cf - the current codeflow
    member - the method or constructor for which arguments are being setup
    arguments - the expression nodes for the expression supplied argument values
  - generateCodeForArgument
```
protected static void generateCodeForArgument(MethodVisitor mv,
                                              CodeFlow cf,
                                              SpelNodeImpl argument,
                                              String paramDesc)
```
    Ask an argument to generate its bytecode and then follow it up with any boxing/unboxing/checkcasting to ensure it matches the expected parameter descriptor.

修饰符和类型	字段	说明
`protected SpelNodeImpl[]`	`children`
`protected String`	`exitTypeDescriptor`	Indicates the type descriptor for the result of this expression node.
`protected int`	`pos`

类 SpelNodeImpl

字段概要

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 java.lang.Object

从接口继承的方法 org.springframework.expression.spel.SpelNode

字段详细资料

pos

children

exitTypeDescriptor

构造器详细资料

SpelNodeImpl

方法详细资料

getPreviousChild

nextChildIs

getValue

getTypedValue

isWritable

setValue

getChild

getChildCount

getObjectClass

getValue

getStartPosition

getEndPosition

getValueRef

isCompilable

generateCode

getExitDescriptor

getValueInternal

generateCodeForArguments

generateCodeForArgument