org.springframework.expression.spel.ast

Class Operator

java.lang.Object

org.springframework.expression.spel.ast.SpelNodeImpl

org.springframework.expression.spel.ast.Operator

All Implemented Interfaces:

Opcodes, SpelNode

Direct Known Subclasses:

OpAnd, OpDec, OpDivide, OpEQ, OperatorBetween, OperatorInstanceof, OperatorMatches, OperatorPower, OpGE, OpGT, OpInc, OpLE, OpLT, OpMinus, OpModulus, OpMultiply, OpNE, OpOr, OpPlus

public abstract class Operator
extends SpelNodeImpl

Common supertype for operators that operate on either one or two operands. In the case of multiply or divide there would be two operands, but for unary plus or minus, there is only one.

Since:

3.0

Author:

Andy Clement, Juergen Hoeller, Giovanni Dall'Oglio Risso

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	Operator.DescriptorComparison A descriptor comparison encapsulates the result of comparing descriptor for two operands and describes at what level they are compatible.

Field Summary

Fields

Modifier and Type	Field and Description
protected String	leftActualDescriptor
protected String	rightActualDescriptor

Fields inherited from class org.springframework.expression.spel.ast.SpelNodeImpl

children, exitTypeDescriptor, pos

Fields inherited from interface 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

Constructor Summary

Constructors

Constructor and Description
Operator(String payload, int pos, SpelNodeImpl... operands)

Method Summary

Modifier and Type	Method and Description
static boolean	equalityCheck(EvaluationContext context, Object left, Object right) Perform an equality check for the given operand values.
protected void	generateComparisonCode(MethodVisitor mv, CodeFlow cf, int compInstruction1, int compInstruction2) Numeric comparison operators share very similar generated code, only differing in two comparison instructions.
SpelNodeImpl	getLeftOperand()
String	getOperatorName()
SpelNodeImpl	getRightOperand()
protected boolean	isCompilableOperatorUsingNumerics()
String	toStringAST() String format for all operators is the same '(' [operand] [operator] [operand] ')'

Methods inherited from class org.springframework.expression.spel.ast.SpelNodeImpl

generateCode, generateCodeForArgument, generateCodeForArguments, getChild, getChildCount, getEndPosition, getExitDescriptor, getObjectClass, getStartPosition, getTypedValue, getValue, getValue, getValueInternal, getValueRef, isCompilable, isWritable, nextChildIs, setValue

Methods inherited from class java.lang.Object

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

Field Detail

leftActualDescriptor

@Nullable
protected String leftActualDescriptor

rightActualDescriptor

@Nullable
protected String rightActualDescriptor

Constructor Detail

Operator

public Operator(String payload,
                int pos,
                SpelNodeImpl... operands)

Method Detail

getLeftOperand

public SpelNodeImpl getLeftOperand()

getRightOperand

public SpelNodeImpl getRightOperand()

getOperatorName

public final String getOperatorName()

toStringAST

public String toStringAST()

String format for all operators is the same '(' [operand] [operator] [operand] ')'

Returns:

the string form of this AST node

isCompilableOperatorUsingNumerics

protected boolean isCompilableOperatorUsingNumerics()

generateComparisonCode

protected void generateComparisonCode(MethodVisitor mv,
                                      CodeFlow cf,
                                      int compInstruction1,
                                      int compInstruction2)

Numeric comparison operators share very similar generated code, only differing in two comparison instructions.

equalityCheck

public static boolean equalityCheck(EvaluationContext context,
                                    @Nullable
                                    Object left,
                                    @Nullable
                                    Object right)

Perform an equality check for the given operand values.

This method is not just used for reflective comparisons in subclasses but also from compiled expression code, which is why it needs to be declared as public static here.

Parameters:

context - the current evaluation context

left - the left-hand operand value

right - the right-hand operand value