org.springframework.expression.spel.ast

## Class Projection

- java.lang.Object
- - org.springframework.expression.spel.ast.SpelNodeImpl
  - - org.springframework.expression.spel.ast.Projection

- All Implemented Interfaces:
    SpelNode

      public class Projection
      extends SpelNodeImpl

  Represents projection, where a given operation is performed on all elements in some input sequence, returning a new sequence of the same size. For example: "{1,2,3,4,5,6,7,8,9,10}.!{#isEven(#this)}" returns "[n, y, n, y, n, y, n, y, n, y]"
  Since:
    3.0
  Author:
    Andy Clement, Mark Fisher

- - ### Field Summary

    - ### Fields inherited from class org.springframework.expression.spel.ast.SpelNodeImpl

      `children, pos`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `Projection(boolean nullSafe, int pos, SpelNodeImpl expression)`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `TypedValue` | `getValueInternal(ExpressionState state)`
    `protected ValueRef` | `getValueRef(ExpressionState state)`
    `String` | `toStringAST()`

    - ### Methods inherited from class org.springframework.expression.spel.ast.SpelNodeImpl

      `getChild, getChildCount, getEndPosition, getObjectClass, getPreviousChild, getStartPosition, getTypedValue, getValue, getValue, isWritable, nextChildIs, setValue`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### Projection

          public Projection(boolean nullSafe,
                    int pos,
                    SpelNodeImpl expression)

  - ### Method Detail

    - #### getValueInternal

          public TypedValue getValueInternal(ExpressionState state)
                                      throws EvaluationException

      Specified by:
        `getValueInternal` in class `SpelNodeImpl`
      Throws:
        `EvaluationException`

    - #### getValueRef

          protected ValueRef getValueRef(ExpressionState state)
                                  throws EvaluationException

      Overrides:
        `getValueRef` in class `SpelNodeImpl`
      Throws:
        `EvaluationException`

    - #### toStringAST

          public String toStringAST()

      Specified by:
        `toStringAST` in interface `SpelNode`
      Specified by:
        `toStringAST` in class `SpelNodeImpl`
      Returns:
        the string form of this AST node