net.sf.jexpel.internal.expr
Class ConstantExpression

java.lang.Object
  net.sf.jexpel.internal.expr.ConstantExpression

All Implemented Interfaces:

Expression, Compilable, MessageCodes, org.objectweb.asm.Opcodes

public class ConstantExpression
extends java.lang.Object
implements Expression, Compilable, MessageCodes

Field Summary

Fields inherited from interface org.objectweb.asm.Opcodes

AALOAD, AASTORE, ACC_ABSTRACT, ACC_ANNOTATION, ACC_BRIDGE, ACC_DEPRECATED, ACC_ENUM, ACC_FINAL, ACC_INTERFACE, ACC_NATIVE, ACC_PRIVATE, ACC_PROTECTED, ACC_PUBLIC, ACC_STATIC, ACC_STRICT, ACC_SUPER, ACC_SYNCHRONIZED, ACC_SYNTHETIC, ACC_TRANSIENT, 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, 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, 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

Fields inherited from interface net.sf.jexpel.messages.MessageCodes

ARRAY_ACCESS, C_NOT_FOUND, COND_TYPES, CONDITIONAL, CONSTANT, EXPECTED, INVALID, INVALID_ARG, LBRA_WO_RBRA, LPAR_WO_RPAR, M_NOT_FOUND, NEAR_TOKEN, NO_ARRAY, PROP_RO, PROP_WO, READ_ONLY

Constructor Summary

ConstantExpression(java.lang.Object value)

Method Summary

void	calculeGet(java.util.List<java.lang.String> objects)
void	calculeSet(java.util.List<java.lang.String> objects)
void	compileGet(org.objectweb.asm.MethodVisitor mv)
void	compileSet(org.objectweb.asm.MethodVisitor mv)
java.lang.Object	get(java.lang.Object scope) Executes the expression and returns its value
java.lang.Class<?>	getType() Gets the result type of the Expression
boolean	isConstant()
void	set(java.lang.Object scope, java.lang.Object value) Executes the expression on set mode.
java.lang.String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

ConstantExpression

public ConstantExpression(java.lang.Object value)

Method Detail

get

public java.lang.Object get(java.lang.Object scope)
                     throws java.lang.Exception

Description copied from interface: Expression

Executes the expression and returns its value

Specified by:

get in interface Expression

Parameters:

scope - the object where the expression will be executed

Returns:

the result

Throws:

java.lang.Exception - all exceptions. No exceptions are treated for better performance.

getType

public java.lang.Class<?> getType()

Description copied from interface: Expression

Gets the result type of the Expression

Specified by:

getType in interface Expression

Returns:

the type

set

public void set(java.lang.Object scope,
                java.lang.Object value)
         throws java.lang.Exception

Description copied from interface: Expression

Executes the expression on set mode. On set mode it won't return value. Not all expressions can be executed on the set mode, the most of them are read only. For eg.

• 'x+1' is read only, but 'x' is read and write;
• 'x[1]' is is read and write;
• 'Math.sqrt(x)' is read only.

Specified by:

set in interface Expression

Parameters:

scope - the object where the expression will be executed

value - the new value to set

Throws:

java.lang.Exception - all exceptions. No exceptions are treated for better performance.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

compileGet

public void compileGet(org.objectweb.asm.MethodVisitor mv)

Specified by:

compileGet in interface Compilable

compileSet

public void compileSet(org.objectweb.asm.MethodVisitor mv)

Specified by:

compileSet in interface Compilable

calculeGet

public void calculeGet(java.util.List<java.lang.String> objects)

Specified by:

calculeGet in interface Compilable

calculeSet

public void calculeSet(java.util.List<java.lang.String> objects)

Specified by:

calculeSet in interface Compilable

isConstant

public boolean isConstant()

Specified by:

isConstant in interface Compilable