Examples with SpelExpressionParser org.springframework.expression.spel.standard.SpelExpressionParser used on opensource projects

Example 11 with SpelExpressionParser

use of org.springframework.expression.spel.standard.SpelExpressionParser in project spring-framework by spring-projects.

the class ExpressionLanguageScenarioTests method testScenario_UsingStandardInfrastructure.

/**
	 * Scenario: using the standard infrastructure and running simple expression evaluation.
	 */
@Test
public void testScenario_UsingStandardInfrastructure() {
    try {
        // Create a parser
        SpelExpressionParser parser = new SpelExpressionParser();
        // Parse an expression
        Expression expr = parser.parseRaw("new String('hello world')");
        // Evaluate it using a 'standard' context
        Object value = expr.getValue();
        // They are reusable
        value = expr.getValue();
        assertEquals("hello world", value);
        assertEquals(String.class, value.getClass());
    } catch (EvaluationException ee) {
        ee.printStackTrace();
        fail("Unexpected Exception: " + ee.getMessage());
    } catch (ParseException pe) {
        pe.printStackTrace();
        fail("Unexpected Exception: " + pe.getMessage());
    }
}

Example 12 with SpelExpressionParser

use of org.springframework.expression.spel.standard.SpelExpressionParser in project spring-framework by spring-projects.

the class ExpressionLanguageScenarioTests method testScenario_AddingYourOwnPropertyResolvers_1.

/**
	 * Scenario: add a property resolver that will get called in the resolver chain, this one only supports reading.
	 */
@Test
public void testScenario_AddingYourOwnPropertyResolvers_1() throws Exception {
    // Create a parser
    SpelExpressionParser parser = new SpelExpressionParser();
    // Use the standard evaluation context
    StandardEvaluationContext ctx = new StandardEvaluationContext();
    ctx.addPropertyAccessor(new FruitColourAccessor());
    Expression expr = parser.parseRaw("orange");
    Object value = expr.getValue(ctx);
    assertEquals(Color.orange, value);
    try {
        expr.setValue(ctx, Color.blue);
        fail("Should not be allowed to set oranges to be blue !");
    } catch (SpelEvaluationException ee) {
        assertEquals(ee.getMessageCode(), SpelMessage.PROPERTY_OR_FIELD_NOT_WRITABLE_ON_NULL);
    }
}

Example 13 with SpelExpressionParser

use of org.springframework.expression.spel.standard.SpelExpressionParser in project spring-framework by spring-projects.

the class ExpressionLanguageScenarioTests method testScenario_DefiningVariablesThatWillBeAccessibleInExpressions.

/**
	 * Scenario: using the standard context but adding your own variables
	 */
@Test
public void testScenario_DefiningVariablesThatWillBeAccessibleInExpressions() throws Exception {
    // Create a parser
    SpelExpressionParser parser = new SpelExpressionParser();
    // Use the standard evaluation context
    StandardEvaluationContext ctx = new StandardEvaluationContext();
    ctx.setVariable("favouriteColour", "blue");
    List<Integer> primes = new ArrayList<>();
    primes.addAll(Arrays.asList(2, 3, 5, 7, 11, 13, 17));
    ctx.setVariable("primes", primes);
    Expression expr = parser.parseRaw("#favouriteColour");
    Object value = expr.getValue(ctx);
    assertEquals("blue", value);
    expr = parser.parseRaw("#primes.get(1)");
    value = expr.getValue(ctx);
    assertEquals(3, value);
    // all prime numbers > 10 from the list (using selection ?{...})
    expr = parser.parseRaw("#primes.?[#this>10]");
    value = expr.getValue(ctx);
    assertEquals("[11, 13, 17]", value.toString());
}

Example 14 with SpelExpressionParser

use of org.springframework.expression.spel.standard.SpelExpressionParser in project spring-framework by spring-projects.

the class EvaluationTests method testCreateObjectsOnAttemptToReferenceNull.

// wibble2 should be null (cannot be initialized dynamically), there is no setter
@Test(expected = SpelEvaluationException.class)
public void testCreateObjectsOnAttemptToReferenceNull() throws Exception {
    TestClass testClass = new TestClass();
    StandardEvaluationContext ctx = new StandardEvaluationContext(testClass);
    ExpressionParser parser = new SpelExpressionParser(new SpelParserConfiguration(true, true));
    Object o = null;
    o = parser.parseExpression("wibble.bar").getValue(ctx);
    assertEquals("hello", o);
    o = parser.parseExpression("wibble").getValue(ctx);
    assertNotNull(o);
    o = parser.parseExpression("wibble2.bar").getValue(ctx);
}

Example 15 with SpelExpressionParser

use of org.springframework.expression.spel.standard.SpelExpressionParser in project spring-framework by spring-projects.

the class EvaluationTests method increment02postfix.

@Test
public void increment02postfix() {
    Spr9751 helper = new Spr9751();
    StandardEvaluationContext ctx = new StandardEvaluationContext(helper);
    ExpressionParser parser = new SpelExpressionParser(new SpelParserConfiguration(true, true));
    Expression e = null;
    // BigDecimal
    e = parser.parseExpression("bd++");
    assertTrue(new BigDecimal("2").equals(helper.bd));
    BigDecimal return_bd = e.getValue(ctx, BigDecimal.class);
    assertTrue(new BigDecimal("2").equals(return_bd));
    assertTrue(new BigDecimal("3").equals(helper.bd));
    // double
    e = parser.parseExpression("ddd++");
    assertEquals(2.0d, helper.ddd, 0d);
    double return_ddd = e.getValue(ctx, Double.TYPE);
    assertEquals(2.0d, return_ddd, 0d);
    assertEquals(3.0d, helper.ddd, 0d);
    // float
    e = parser.parseExpression("fff++");
    assertEquals(3.0f, helper.fff, 0d);
    float return_fff = e.getValue(ctx, Float.TYPE);
    assertEquals(3.0f, return_fff, 0d);
    assertEquals(4.0f, helper.fff, 0d);
    // long
    e = parser.parseExpression("lll++");
    assertEquals(66666L, helper.lll);
    long return_lll = e.getValue(ctx, Long.TYPE);
    assertEquals(66666L, return_lll);
    assertEquals(66667L, helper.lll);
    // int
    e = parser.parseExpression("iii++");
    assertEquals(42, helper.iii);
    int return_iii = e.getValue(ctx, Integer.TYPE);
    assertEquals(42, return_iii);
    assertEquals(43, helper.iii);
    return_iii = e.getValue(ctx, Integer.TYPE);
    assertEquals(43, return_iii);
    assertEquals(44, helper.iii);
    // short
    e = parser.parseExpression("sss++");
    assertEquals(15, helper.sss);
    short return_sss = e.getValue(ctx, Short.TYPE);
    assertEquals(15, return_sss);
    assertEquals(16, helper.sss);
}