Package org.springframework.binding.expression.support

Class AbstractGetValueExpression

java.lang.Object
org.springframework.binding.expression.support.AbstractGetValueExpression
All Implemented Interfaces:
Expression
public abstract class AbstractGetValueExpression extends Object implements Expression
Trivial helper for concrete expression types that do not support setting their values. Simply throws an unsupported operation exception if setValue(Object, Object) is called. Subclasses must implement getValue(Object).
Author:
Keith Donald

  • Constructor Details

    • AbstractGetValueExpression

      public AbstractGetValueExpression()

  • Method Details

    • getValue

      public abstract Object getValue(Object context) throws EvaluationException
      Description copied from interface: Expression
      Evaluate this expression in the provided context and return the result of evaluation.
      Specified by:
      getValue in interface Expression
      Parameters:
      context - the context to evaluate this expression in
      Returns:
      the evaluation result
      Throws:
      EvaluationException - an exception occurred during expression evaluation

    • setValue

      public void setValue(Object context, Object value) throws EvaluationException
      Description copied from interface: Expression
      Set this expression in the provided context to the value provided.
      Specified by:
      setValue in interface Expression
      Parameters:
      context - the context on which the new value should be set
      value - the new value to set
      Throws:
      EvaluationException - an exception occurred during expression evaluation

    • getValueType

      public Class<?> getValueType(Object context)
      Description copied from interface: Expression
      Returns the most general type that can be passed to the Expression.setValue(Object, Object) method for the given context.
      Specified by:
      getValueType in interface Expression
      Parameters:
      context - the context to evaluate
      Returns:
      the most general type of value that can be set on this context, or null if the type information cannot be determined

    • getExpressionString

      public String getExpressionString()
      Description copied from interface: Expression
      Returns the original string used to create this expression, unmodified.
      Specified by:
      getExpressionString in interface Expression
      Returns:
      the original expression string