org.springframework.expression.spel.ast

Class CompoundExpression

  • All Implemented Interfaces:
    Opcodes, SpelNode


    public class CompoundExpression
    extends SpelNodeImpl
    Represents a DOT separated expression sequence, such as 'property1.property2.methodOne()'.
    Since:
    3.0
    Author:
    Andy Clement
    • Constructor Detail

      • CompoundExpression

        public CompoundExpression(int pos,
                                  SpelNodeImpl... expressionComponents)
    • Method Detail

      • getValueInternal

        public TypedValue getValueInternal(ExpressionState state)
                                    throws EvaluationException
        Evaluates a compound expression. This involves evaluating each piece in turn and the return value from each piece is the active context object for the subsequent piece.
        Specified by:
        getValueInternal in class SpelNodeImpl
        Parameters:
        state - the state in which the expression is being evaluated
        Returns:
        the final value from the last piece of the compound expression
        Throws:
        EvaluationException
      • setValue

        public void setValue(ExpressionState state,
                             @Nullable
                             java.lang.Object value)
                      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)
        value - 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