Examples of org.springframework.expression.ExpressionParser.parseExpression()

Class org.springframework.expression.ExpressionParser

Examples of org.springframework.expression.ExpressionParser.parseExpression()

org.springframework.expression.ExpressionParser.parseExpression()
Parse the expression string and return an Expression object you can use for repeated evaluation.
Some examples:
```
 3 + 4 name.firstName 
```
@param expressionString the raw expression string to parse @return an evaluator for the parsed expression @throws ParseException an exception occurred during parsing

  public static Boolean evaluateExpression(Object obj, String expression) {
    if (StringUtil.isEmpty(expression)) 
      return false;
    try {
      ExpressionParser parser = new SpelExpressionParser();
      Expression exp = parser.parseExpression(expression);
      return exp.getValue(obj, Boolean.class);     
    } catch (Exception e) {
      _log.debug("Failed to evaluate expression ["+expression+"] for object ["+obj.getClass()+"].");
      _log.debug(e.getMessage());
      return false;

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  public void testCustomMapAccessor() throws Exception {
    ExpressionParser parser = new SpelExpressionParser();
    StandardEvaluationContext ctx = TestScenarioCreator.getTestEvaluationContext();
    ctx.addPropertyAccessor(new MapAccessor());


    Expression expr = parser.parseExpression("testMap.monday");
    Object value = expr.getValue(ctx, String.class);
    assertEquals("montag", value);
  }


  @Test

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  public void testVariableMapAccess() throws Exception {
    ExpressionParser parser = new SpelExpressionParser();
    StandardEvaluationContext ctx = TestScenarioCreator.getTestEvaluationContext();
    ctx.setVariable("day", "saturday");


    Expression expr = parser.parseExpression("testMap[#day]");
    Object value = expr.getValue(ctx, String.class);
    assertEquals("samstag", value);
  }


  @Test

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    props1.put("key3", "value3");


    Object bean = new TestBean("name1", new TestBean("name2", null, "Description 2", 15, props1), "description 1", 6, props1);


    ExpressionParser parser = new SpelExpressionParser();
    Expression expr = parser.parseExpression("testBean.properties['key2']");
    assertEquals("value2", expr.getValue(bean));
  }


  @Test
  public void testGetValueFromRootMap() {

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  public void testGetValueFromRootMap() {
    Map<String, String> map = new HashMap<String, String>();
    map.put("key", "value");


    ExpressionParser spelExpressionParser = new SpelExpressionParser();
    Expression expr = spelExpressionParser.parseExpression("#root['key']");
    assertEquals("value", expr.getValue(map));
  }


  @Test
  public void testGetValuePerformance() throws Exception {

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    Map<String, String> map = new HashMap<String, String>();
    map.put("key", "value");
    EvaluationContext context = new StandardEvaluationContext(map);


    ExpressionParser spelExpressionParser = new SpelExpressionParser();
    Expression expr = spelExpressionParser.parseExpression("#root['key']");


    StopWatch s = new StopWatch();
    s.start();
    for (int i = 0; i < 10000; i++) {
      expr.getValue(context);

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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());
    assertTrue(colorsMap.containsKey("beige"));
    assertTrue(colorsMap.containsKey("blue"));

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  @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());
    assertEquals("beige", colorsMap.keySet().iterator().next());
  }

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  @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());
    assertEquals("brown", colorsMap.keySet().iterator().next());
  }

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public class EvaluationTests extends AbstractExpressionTests {


  @Test
  public void testCreateListsOnAttemptToIndexNull01() throws EvaluationException, ParseException {
    ExpressionParser parser = new SpelExpressionParser(new SpelParserConfiguration(true, true));
    Expression expression = parser.parseExpression("list[0]");
    TestClass testClass = new TestClass();
    Object o = null;
    o = expression.getValue(new StandardEvaluationContext(testClass));
    assertEquals("", o);
    o = parser.parseExpression("list[3]").getValue(new StandardEvaluationContext(testClass));

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