Class VariableReference
- java.lang.Object
- org.springframework.expression.spel.ast.SpelNodeImpl
- org.springframework.expression.spel.ast.VariableReference
public class VariableReference extends SpelNodeImpl
Represents a variable reference, eg. #someVar. Note this is different to a *local* variable like $someVar- Since:
- 3.0
- Author:
- Andy Clement
Field Summary
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 Description VariableReference(String variableName, int pos)
Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
generateCode(MethodVisitor mv, CodeFlow cf)
Generate the bytecode for this node into the supplied visitor.TypedValue
getValueInternal(ExpressionState state)
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 value)
Evaluate the expression to a node and then set the new value on that node.String
toStringAST()
Methods inherited from class org.springframework.expression.spel.ast.SpelNodeImpl
generateCodeForArgument, generateCodeForArguments, getChild, getChildCount, getEndPosition, getExitDescriptor, getObjectClass, getPreviousChild, getStartPosition, getTypedValue, getValue, getValue, nextChildIs
Constructor Detail
VariableReference
public VariableReference(String variableName, int pos)
Method Detail
getValueRef
public ValueRef getValueRef(ExpressionState state) throws SpelEvaluationException
- Overrides:
getValueRef
in classSpelNodeImpl
- Throws:
SpelEvaluationException
getValueInternal
public TypedValue getValueInternal(ExpressionState state) throws SpelEvaluationException
- Specified by:
getValueInternal
in classSpelNodeImpl
- Throws:
SpelEvaluationException
setValue
public void setValue(ExpressionState state, Object value) throws SpelEvaluationException
Description copied from interface: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.- Specified by:
setValue
in interfaceSpelNode
- Overrides:
setValue
in classSpelNodeImpl
- Parameters:
state
- the current expression state (includes the context)value
- the new value- Throws:
SpelEvaluationException
toStringAST
public String toStringAST()
- Returns:
- the string form of this AST node
isWritable
public boolean isWritable(ExpressionState expressionState) throws SpelEvaluationException
Description copied from interface:SpelNode
Determine if this expression node will support a setValue() call.- Specified by:
isWritable
in interfaceSpelNode
- Overrides:
isWritable
in classSpelNodeImpl
- Parameters:
expressionState
- the current expression state (includes the context)- Returns:
- true if the expression node will allow setValue()
- Throws:
SpelEvaluationException
isCompilable
public boolean isCompilable()
Description copied from class: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.- Overrides:
isCompilable
in classSpelNodeImpl
- Returns:
true
if this node can be compiled to bytecode
generateCode
public void generateCode(MethodVisitor mv, CodeFlow cf)
Description copied from class: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. For example it will include information about the type of the object currently on the stack.- Overrides:
generateCode
in classSpelNodeImpl
- Parameters:
mv
- the ASM MethodVisitor into which code should be generatedcf
- a context object with info about what is on the stack