org.springframework.expression.spel.ast

类 Indexer

java.lang.Object

org.springframework.expression.spel.ast.SpelNodeImpl

org.springframework.expression.spel.ast.Indexer

所有已实现的接口:

org.springframework.asm.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

构造器和说明
Indexer(int pos, SpelNodeImpl expr)

方法概要

限定符和类型	方法和说明
void	generateCode(org.springframework.asm.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, 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,
                     @Nullable
                     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(org.springframework.asm.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, e.g. including 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