Package org.springframework.expression.spel.ast

Class OpMinus

java.lang.Object
org.springframework.expression.spel.ast.SpelNodeImpl
org.springframework.expression.spel.ast.Operator
org.springframework.expression.spel.ast.OpMinus
All Implemented Interfaces:
org.springframework.asm.Opcodes, SpelNode
public class OpMinus extends Operator
The minus operator supports:
  • subtraction of numbers
  • subtraction of an int from a string of one character (effectively decreasing that character), so 'd' - 3 = 'a'

It can be used as a unary operator for numbers. The standard promotions are performed when the operand types vary (double-int=double). For other options it defers to the registered overloader.

Since:
3.0
Author:
Andy Clement, Juergen Hoeller, Giovanni Dall'Oglio Risso, Sam Brannen, Semyon Danilov

  • Nested Class Summary

    Nested classes/interfaces inherited from class org.springframework.expression.spel.ast.Operator

    Operator.DescriptorComparison

  • Field Summary

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

    leftActualDescriptor, rightActualDescriptor

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

    children, exitTypeDescriptor

    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_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, ASM10_EXPERIMENTAL, ASM4, ASM5, ASM6, ASM7, ASM8, ASM9, 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, SOURCE_DEPRECATED, SOURCE_MASK, SWAP, 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, V22, V23, V24, V25, V9

  • Constructor Summary

    Constructors
    Constructor
    Description
    OpMinus(int startPos, int endPos, SpelNodeImpl... operands)
     

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    generateCode(org.springframework.asm.MethodVisitor mv, CodeFlow cf)
    Generate the bytecode for this node into the supplied MethodVisitor.
    SpelNodeImpl
    getRightOperand()
     
    TypedValue
    getValueInternal(ExpressionState state)
     
    boolean
    isCompilable()
    Determine if this node can be compiled to bytecode.
    boolean
    isNegativeNumberLiteral()
    Determine if this operator is a unary minus and its child is a number literal.
    String
    toStringAST()
    String format for all operators is the same '(' [operand] [operator] [operand] ')'.

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

    equalityCheck, generateComparisonCode, getLeftOperand, getOperatorName, isCompilableOperatorUsingNumerics

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

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

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • OpMinus

      public OpMinus(int startPos, int endPos, SpelNodeImpl... operands)

  • Method Details

    • isNegativeNumberLiteral

      public boolean isNegativeNumberLiteral()
      Determine if this operator is a unary minus and its child is a number literal.
      Returns:
      true if it is a negative number literal
      Since:
      6.1

    • getValueInternal

      public TypedValue getValueInternal(ExpressionState state) throws EvaluationException
      Specified by:
      getValueInternal in class SpelNodeImpl
      Throws:
      EvaluationException

    • toStringAST

      public String toStringAST()
      Description copied from class: Operator
      String format for all operators is the same '(' [operand] [operator] [operand] ')'.
      Specified by:
      toStringAST in interface SpelNode
      Overrides:
      toStringAST in class Operator
      Returns:
      the string form

    • getRightOperand

      public SpelNodeImpl getRightOperand()
      Overrides:
      getRightOperand in class Operator

    • isCompilable

      public boolean isCompilable()
      Description copied from interface: SpelNode
      Determine if this 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.

      The default implementation returns false.

      If you override this method, you must also override SpelNode.generateCode(MethodVisitor, CodeFlow).

      Returns:
      true if this node can be compiled to bytecode
      See Also:

    • generateCode

      public void generateCode(org.springframework.asm.MethodVisitor mv, CodeFlow cf)
      Description copied from interface: SpelNode
      Generate the bytecode for this node into the supplied MethodVisitor.

      Context information about the current expression being compiled is available in the supplied CodeFlow object — for example, information about the type of the object currently on the stack.

      This method will not be invoked unless SpelNode.isCompilable() returns true.

      The default implementation throws an IllegalStateException since SpelNode.isCompilable() returns false by default.

      If you override this method, you must also override SpelNode.isCompilable().

      Parameters:
      mv - the ASM MethodVisitor into which code should be generated
      cf - a context object with information about what is on the stack
      See Also: