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

    ExpressionParser parser = new SpelExpressionParser(config);
    Expression expression = parser.parseExpression("name");
    expression.setValue(context, "Oleg");
    assertEquals("Oleg", person.getName());


    expression = parser.parseExpression("address.street");
    expression.setValue(context, "123 High St");
    assertEquals("123 High St", person.getAddress().getStreet());


    expression = parser.parseExpression("address.crossStreets[0]");
    expression.setValue(context, "Blah");

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    expression = parser.parseExpression("address.street");
    expression.setValue(context, "123 High St");
    assertEquals("123 High St", person.getAddress().getStreet());


    expression = parser.parseExpression("address.crossStreets[0]");
    expression.setValue(context, "Blah");
    assertEquals("Blah", person.getAddress().getCrossStreets().get(0));


    expression = parser.parseExpression("address.crossStreets[3]");
    expression.setValue(context, "Wibble");

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    expression = parser.parseExpression("address.crossStreets[0]");
    expression.setValue(context, "Blah");
    assertEquals("Blah", person.getAddress().getCrossStreets().get(0));


    expression = parser.parseExpression("address.crossStreets[3]");
    expression.setValue(context, "Wibble");
    assertEquals("Blah", person.getAddress().getCrossStreets().get(0));
    assertEquals("Wibble", person.getAddress().getCrossStreets().get(3));
  }

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  @Test
  public void caseInsensitiveNullLiterals() {
    ExpressionParser parser = new SpelExpressionParser();
    Expression exp;


    exp = parser.parseExpression("null");
    assertNull(exp.getValue());


    exp = parser.parseExpression("NULL");
    assertNull(exp.getValue());

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    Expression exp;


    exp = parser.parseExpression("null");
    assertNull(exp.getValue());


    exp = parser.parseExpression("NULL");
    assertNull(exp.getValue());


    exp = parser.parseExpression("NuLl");
    assertNull(exp.getValue());
  }

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    assertNull(exp.getValue());


    exp = parser.parseExpression("NULL");
    assertNull(exp.getValue());


    exp = parser.parseExpression("NuLl");
    assertNull(exp.getValue());
  }


  /**
   * Verifies behavior requested in SPR-9621.

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    Spr9751 instance = new Spr9751();


    // Add a new element to the list
    StandardEvaluationContext ctx = new StandardEvaluationContext(instance);
    ExpressionParser parser = new SpelExpressionParser(new SpelParserConfiguration(true, true));
    Expression e =  parser.parseExpression("listOfStrings[++index3]='def'");
    e.getValue(ctx);
    assertEquals(2,instance.listOfStrings.size());
    assertEquals("def",instance.listOfStrings.get(1));


    // Check reference beyond end of collection

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    assertEquals("def",instance.listOfStrings.get(1));


    // Check reference beyond end of collection
    ctx = new StandardEvaluationContext(instance);
    parser = new SpelExpressionParser(new SpelParserConfiguration(true, true));
    e =  parser.parseExpression("listOfStrings[0]");
    String value = e.getValue(ctx,String.class);
    assertEquals("abc",value);
    e =  parser.parseExpression("listOfStrings[1]");
    value = e.getValue(ctx,String.class);
    assertEquals("def",value);

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    ctx = new StandardEvaluationContext(instance);
    parser = new SpelExpressionParser(new SpelParserConfiguration(true, true));
    e =  parser.parseExpression("listOfStrings[0]");
    String value = e.getValue(ctx,String.class);
    assertEquals("abc",value);
    e =  parser.parseExpression("listOfStrings[1]");
    value = e.getValue(ctx,String.class);
    assertEquals("def",value);
    e =  parser.parseExpression("listOfStrings[2]");
    value = e.getValue(ctx,String.class);
    assertEquals("",value);

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    String value = e.getValue(ctx,String.class);
    assertEquals("abc",value);
    e =  parser.parseExpression("listOfStrings[1]");
    value = e.getValue(ctx,String.class);
    assertEquals("def",value);
    e =  parser.parseExpression("listOfStrings[2]");
    value = e.getValue(ctx,String.class);
    assertEquals("",value);


    // Now turn off growing and reference off the end
    ctx = new StandardEvaluationContext(instance);

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