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## org.springframework.expression
Interface EvaluationContext

All Known Implementing Classes:
  StandardEvaluationContext

    public interface EvaluationContext

Expressions are executed in an evaluation context. It is in this context that references are resolved when encountered during expression evaluation.

There is a default implementation of the EvaluationContext, `StandardEvaluationContext` that can be extended, rather than having to implement everything.

Since:
  3.0
Author:
  Andy Clement, Juergen Hoeller

Method Summary
`BeanResolver` | `getBeanResolver()`
`List<ConstructorResolver>` | `getConstructorResolvers()`
`List<MethodResolver>` | `getMethodResolvers()`
`OperatorOverloader` | `getOperatorOverloader()`
`List<PropertyAccessor>` | `getPropertyAccessors()`
`TypedValue` | `getRootObject()`
`TypeComparator` | `getTypeComparator()`
`TypeConverter` | `getTypeConverter()`
`TypeLocator` | `getTypeLocator()`
`Object` | `lookupVariable(String name)` Look up a named variable within this evaluation context.
`void` | `setVariable(String name, Object value)` Set a named variable within this evaluation context to a specified value.

Method Detail

### getRootObject

    TypedValue getRootObject()

  Returns:
    the default root context object against which unqualified properties/methods/etc should be resolved. This can be overridden when evaluating an expression.

### getConstructorResolvers

    List<ConstructorResolver> getConstructorResolvers()

  Returns:
    a list of resolvers that will be asked in turn to locate a constructor

### getMethodResolvers

    List<MethodResolver> getMethodResolvers()

  Returns:
    a list of resolvers that will be asked in turn to locate a method

### getPropertyAccessors

    List<PropertyAccessor> getPropertyAccessors()

  Returns:
    a list of accessors that will be asked in turn to read/write a property

### getTypeLocator

    TypeLocator getTypeLocator()

  Returns:
    a type locator that can be used to find types, either by short or fully qualified name.

### getTypeConverter

    TypeConverter getTypeConverter()

  Returns:
    a type converter that can convert (or coerce) a value from one type to another.

### getTypeComparator

    TypeComparator getTypeComparator()

  Returns:
    a type comparator for comparing pairs of objects for equality.

### getOperatorOverloader

    OperatorOverloader getOperatorOverloader()

  Returns:
    an operator overloader that may support mathematical operations between more than the standard set of types

### getBeanResolver

    BeanResolver getBeanResolver()

  Returns:
    a bean resolver that can look up beans by name

### setVariable

    void setVariable(String name,
                     Object value)

  Set a named variable within this evaluation context to a specified value.

  Parameters:
    `name` - variable to set
    `value` - value to be placed in the variable

### lookupVariable

    Object lookupVariable(String name)

  Look up a named variable within this evaluation context.

  Parameters:
    `name` - variable to lookup
  Returns:
    the value of the variable

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