程序包 cn.taketoday.expression.spel.ast

类 FunctionReference

java.lang.Object

cn.taketoday.expression.spel.ast.SpelNodeImpl

cn.taketoday.expression.spel.ast.FunctionReference

所有已实现的接口:

Opcodes, SpelNode

public class FunctionReference
extends SpelNodeImpl

A function reference is of the form "#someFunction(a,b,c)". Functions may be defined in the context prior to the expression being evaluated. Functions may also be static Java methods, registered in the context prior to invocation of the expression.

Functions are very simplistic. The arguments are not part of the definition (right now), so the names must be unique.

从以下版本开始:

4.0

作者:

Andy Clement, Juergen Hoeller, Harry Yang

字段概要

字段

修饰符和类型	字段	说明
private Method	method
private final String	name

从类继承的字段 cn.taketoday.expression.spel.ast.SpelNodeImpl

children, exitTypeDescriptor

从接口继承的字段 cn.taketoday.bytecode.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, 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, JAVA_VERSION, 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, PRIVATE_FINAL_STATIC, PUTFIELD, PUTSTATIC, RET, RETURN, SALOAD, SASTORE, SIPUSH, SOURCE_DEPRECATED, SOURCE_MASK, SWAP, SWITCH_STYLE_HASH, SWITCH_STYLE_HASHONLY, SWITCH_STYLE_TRIE, 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

构造器概要

构造器

构造器	说明
FunctionReference(String functionName, int startPos, int endPos, SpelNodeImpl... arguments)

方法概要

修饰符和类型	方法	说明
private TypedValue	executeFunctionViaMethod(ExpressionState state, Method method)	Execute a function represented as a Method.
private TypedValue	executeFunctionViaMethodHandle(ExpressionState state, MethodHandle methodHandle)	Execute a function represented as MethodHandle.
void	generateCode(MethodVisitor mv, CodeFlow cf)	Generate the bytecode for this node into the supplied visitor.
private Object[]	getArguments(ExpressionState state)	Compute the arguments to the function, they are the children of this expression node.
TypedValue	getValueInternal(ExpressionState state)
boolean	isCompilable()	Check whether a node can be compiled to bytecode.
String	toStringAST()	Return the string form the this AST node.

从类继承的方法 cn.taketoday.expression.spel.ast.SpelNodeImpl

generateCodeForArgument, generateCodeForArguments, getChild, getChildCount, getEndPosition, getExitDescriptor, getObjectClass, getStartPosition, getTypedValue, getValue, getValue, getValueRef, isWritable, nextChildIs, setValue, setValueInternal

从类继承的方法 java.lang.Object

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

字段详细资料

name

private final String name

method

@Nullable
private volatile Method method

构造器详细资料

FunctionReference

public FunctionReference(String functionName,
 int startPos,
 int endPos,
 SpelNodeImpl... arguments)

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

executeFunctionViaMethod

private TypedValue executeFunctionViaMethod(ExpressionState state,
 Method method)
                                     throws EvaluationException

Execute a function represented as a Method.

参数:

state - the expression evaluation state

method - the method to invoke

返回:

the return value of the invoked Java method

抛出:

EvaluationException - if there is any problem invoking the method

executeFunctionViaMethodHandle

private TypedValue executeFunctionViaMethodHandle(ExpressionState state,
 MethodHandle methodHandle)
                                           throws EvaluationException

Execute a function represented as MethodHandle.

Method types that take no arguments (fully bound handles or static methods with no parameters) can use MethodHandle#invoke() which is the most efficient. Otherwise, MethodHandle#invokeWithArguments() is used.

参数:

state - the expression evaluation state

methodHandle - the method handle to invoke

返回:

the return value of the invoked Java method

抛出:

EvaluationException - if there is any problem invoking the method

toStringAST

public String toStringAST()

从接口复制的说明: SpelNode

Return the string form the this AST node.

返回:

the string form

getArguments

private Object[] getArguments(ExpressionState state)
                       throws EvaluationException

Compute the arguments to the function, they are the children of this expression node.

返回:

an array of argument values for the function call

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, 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