org.springframework.expression.spel.ast

Class PropertyOrFieldReference

  • All Implemented Interfaces:
    Opcodes, SpelNode


    public class PropertyOrFieldReference
    extends SpelNodeImpl
    Represents a simple property or field reference.
    Since:
    3.0
    Author:
    Andy Clement, Juergen Hoeller, Clark Duplichien
    • Constructor Detail

      • PropertyOrFieldReference

        public PropertyOrFieldReference(boolean nullSafe,
                                        java.lang.String propertyOrFieldName,
                                        int pos)
    • Method Detail

      • isNullSafe

        public boolean isNullSafe()
      • getName

        public java.lang.String getName()
      • setValue

        public void setValue(ExpressionState state,
                             @Nullable
                             java.lang.Object newValue)
                      throws EvaluationException
        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 interface SpelNode
        Overrides:
        setValue in class SpelNodeImpl
        Parameters:
        state - the current expression state (includes the context)
        newValue - the new value
        Throws:
        EvaluationException - if any problem occurs evaluating the expression or setting the new value
      • isWritable

        public boolean isWritable(ExpressionState state)
                           throws EvaluationException
        Description copied from interface: SpelNode
        Determine if this expression node will support a setValue() call.
        Specified by:
        isWritable in interface SpelNode
        Overrides:
        isWritable in class SpelNodeImpl
        Parameters:
        state - the current expression state (includes the context)
        Returns:
        true if the expression node will allow setValue()
        Throws:
        EvaluationException - if something went wrong trying to determine if the node supports writing
      • toStringAST

        public java.lang.String toStringAST()
        Description copied from interface: SpelNode
        Return the string form the this AST node.
        Returns:
        the string form
      • 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 class SpelNodeImpl
        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 class SpelNodeImpl
        Parameters:
        mv - the ASM MethodVisitor into which code should be generated
        cf - a context object with info about what is on the stack