Examples of org.springframework.expression.EvaluationContext

org.springframework.expression.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, {@link org.springframework.expression.spel.support.StandardEvaluationContext}that can be extended, rather than having to implement everything. @author Andy Clement @author Juergen Hoeller @since 3.0

  }


  @Test
  public void selectionWithPrimitiveArray() throws Exception {
    Expression expression = new SpelExpressionParser().parseRaw("ints.?[#this<5]");
    EvaluationContext context = new StandardEvaluationContext(new ArrayTestBean());
    Object value = expression.getValue(context);
    assertTrue(value.getClass().isArray());
    TypedValue typedValue = new TypedValue(value);
    assertEquals(Integer.class, typedValue.getTypeDescriptor().getElementTypeDescriptor().getType());
    Integer[] array = (Integer[]) value;

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  }


  @Test
  public void selectFirstItemInPrimitiveArray() throws Exception {
    Expression expression = new SpelExpressionParser().parseRaw("ints.^[#this<5]");
    EvaluationContext context = new StandardEvaluationContext(new ArrayTestBean());
    Object value = expression.getValue(context);
    assertTrue(value instanceof Integer);
    assertEquals(0, value);
  }

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  }


  @Test
  public void selectLastItemInPrimitiveArray() throws Exception {
    Expression expression = new SpelExpressionParser().parseRaw("ints.$[#this<5]");
    EvaluationContext context = new StandardEvaluationContext(new ArrayTestBean());
    Object value = expression.getValue(context);
    assertTrue(value instanceof Integer);
    assertEquals(4, value);
  }

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  }


  @Test
  @SuppressWarnings("unchecked")
  public void selectionWithMap() {
    EvaluationContext context = new StandardEvaluationContext(new MapTestBean());
    ExpressionParser parser = new SpelExpressionParser();
    Expression exp = parser.parseExpression("colors.?[key.startsWith('b')]");


    Map<String, String> colorsMap = (Map<String, String>) exp.getValue(context);
    assertEquals(3, colorsMap.size());

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  }


  @Test
  @SuppressWarnings("unchecked")
  public void selectFirstItemInMap() {
    EvaluationContext context = new StandardEvaluationContext(new MapTestBean());
    ExpressionParser parser = new SpelExpressionParser();


    Expression exp = parser.parseExpression("colors.^[key.startsWith('b')]");
    Map<String, String> colorsMap = (Map<String, String>) exp.getValue(context);
    assertEquals(1, colorsMap.size());

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  }


  @Test
  @SuppressWarnings("unchecked")
  public void selectLastItemInMap() {
    EvaluationContext context = new StandardEvaluationContext(new MapTestBean());
    ExpressionParser parser = new SpelExpressionParser();


    Expression exp = parser.parseExpression("colors.$[key.startsWith('b')]");
    Map<String, String> colorsMap = (Map<String, String>) exp.getValue(context);
    assertEquals(1, colorsMap.size());

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  }


  @Test
  public void projectionWithList() throws Exception {
    Expression expression = new SpelExpressionParser().parseRaw("#testList.![wrapper.value]");
    EvaluationContext context = new StandardEvaluationContext();
    context.setVariable("testList", IntegerTestBean.createList());
    Object value = expression.getValue(context);
    assertTrue(value instanceof List);
    List<?> list = (List<?>) value;
    assertEquals(3, list.size());
    assertEquals(5, list.get(0));

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  }


  @Test
  public void projectionWithSet() throws Exception {
    Expression expression = new SpelExpressionParser().parseRaw("#testList.![wrapper.value]");
    EvaluationContext context = new StandardEvaluationContext();
    context.setVariable("testList", IntegerTestBean.createSet());
    Object value = expression.getValue(context);
    assertTrue(value instanceof List);
    List<?> list = (List<?>) value;
    assertEquals(3, list.size());
    assertEquals(5, list.get(0));

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  }


  @Test
  public void projectionWithArray() throws Exception {
    Expression expression = new SpelExpressionParser().parseRaw("#testArray.![wrapper.value]");
    EvaluationContext context = new StandardEvaluationContext();
    context.setVariable("testArray", IntegerTestBean.createArray());
    Object value = expression.getValue(context);
    assertTrue(value.getClass().isArray());
    TypedValue typedValue = new TypedValue(value);
    assertEquals(Number.class, typedValue.getTypeDescriptor().getElementTypeDescriptor().getType());
    Number[] array = (Number[]) value;

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 */
public class ExpressionStateTests extends AbstractExpressionTests {


  @Test
  public void testConstruction() {
    EvaluationContext context = TestScenarioCreator.getTestEvaluationContext();
    ExpressionState state = new ExpressionState(context);
    assertEquals(context,state.getEvaluationContext());
  }

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