Examples of org.springframework.expression.ExpressionParser

org.springframework.expression.ExpressionParser
Parses expression strings into compiled expressions that can be evaluated. Supports parsing templates as well as standard expression strings. @author Keith Donald @author Andy Clement @since 3.0

  public void collectionGrowingViaIndexer() {
    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
    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);


    // Now turn off growing and reference off the end
    ctx = new StandardEvaluationContext(instance);
    parser = new SpelExpressionParser(new SpelParserConfiguration(false, false));
    e =  parser.parseExpression("listOfStrings[3]");
    try {
      e.getValue(ctx,String.class);
      fail();
    } catch (SpelEvaluationException see) {
      assertEquals(SpelMessage.COLLECTION_INDEX_OUT_OF_BOUNDS,see.getMessageCode());

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  // For now I am making #this not assignable
  @Test
  public void increment01root() {
    Integer i = 42;
    StandardEvaluationContext ctx = new StandardEvaluationContext(i);
    ExpressionParser parser = new SpelExpressionParser(new SpelParserConfiguration(true, true));
    Expression e =  parser.parseExpression("#this++");
    assertEquals(42,i.intValue());
    try {
      e.getValue(ctx,Integer.class);
      fail();
    } catch (SpelEvaluationException see) {

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  @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);
  }

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  @Test
  public void increment02prefix() {
    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("3").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(3.0d,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(4.0f,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(66667L,return_lll);
    assertEquals(66667L,helper.lll);


    // int
    e = parser.parseExpression("++iii");
    assertEquals(42,helper.iii);
    int return_iii = e.getValue(ctx,Integer.TYPE);
    assertEquals(43,return_iii);
    assertEquals(43,helper.iii);
    return_iii = e.getValue(ctx,Integer.TYPE);
    assertEquals(44,return_iii);
    assertEquals(44,helper.iii);


    // short
    e = parser.parseExpression("++sss");
    assertEquals(15,helper.sss);
    int return_sss = (Integer)e.getValue(ctx);
    assertEquals(16,return_sss);
    assertEquals(16,helper.sss);
  }

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  @Test
  public void increment03() {
    Spr9751 helper = new Spr9751();
    StandardEvaluationContext ctx = new StandardEvaluationContext(helper);
    ExpressionParser parser = new SpelExpressionParser(new SpelParserConfiguration(true, true));
    Expression e = null;


    e = parser.parseExpression("m()++");
    try {
      e.getValue(ctx,Double.TYPE);
      fail();
    } catch (SpelEvaluationException see) {
      assertEquals(SpelMessage.OPERAND_NOT_INCREMENTABLE,see.getMessageCode());
    }


    e = parser.parseExpression("++m()");
    try {
      e.getValue(ctx,Double.TYPE);
      fail();
    } catch (SpelEvaluationException see) {
      assertEquals(SpelMessage.OPERAND_NOT_INCREMENTABLE,see.getMessageCode());

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  @Test
  public void increment04() {
    Integer i = 42;
    StandardEvaluationContext ctx = new StandardEvaluationContext(i);
    ExpressionParser parser = new SpelExpressionParser(new SpelParserConfiguration(true, true));
    try {
      Expression e =  parser.parseExpression("++1");
      e.getValue(ctx,Integer.class);
      fail();
    } catch (SpelEvaluationException see) {
      assertEquals(SpelMessage.NOT_ASSIGNABLE,see.getMessageCode());
    }
    try {
      Expression e =  parser.parseExpression("1++");
      e.getValue(ctx,Integer.class);
      fail();
    } catch (SpelEvaluationException see) {
      assertEquals(SpelMessage.NOT_ASSIGNABLE,see.getMessageCode());
    }

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  }
  @Test
  public void decrement01root() {
    Integer i = 42;
    StandardEvaluationContext ctx = new StandardEvaluationContext(i);
    ExpressionParser parser = new SpelExpressionParser(new SpelParserConfiguration(true, true));
    Expression e =  parser.parseExpression("#this--");
    assertEquals(42,i.intValue());
    try {
      e.getValue(ctx,Integer.class);
      fail();
    } catch (SpelEvaluationException see) {

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  @Test
  public void decrement02postfix() {
    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("1").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(1.0d,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(2.0f,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(66665L,helper.lll);


    // int
    e = parser.parseExpression("iii--");
    assertEquals(42,helper.iii);
    int return_iii = e.getValue(ctx,Integer.TYPE);
    assertEquals(42,return_iii);
    assertEquals(41,helper.iii);
    return_iii = e.getValue(ctx,Integer.TYPE);
    assertEquals(41,return_iii);
    assertEquals(40,helper.iii);


    // short
    e = parser.parseExpression("sss--");
    assertEquals(15,helper.sss);
    short return_sss = e.getValue(ctx,Short.TYPE);
    assertEquals(15,return_sss);
    assertEquals(14,helper.sss);
  }

View Full Code Here


  @Test
  public void decrement02prefix() {
    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("1").equals(return_bd));
    assertTrue(new BigDecimal("1").equals(helper.bd));


    // double
    e = parser.parseExpression("--ddd");
    assertEquals(2.0d,helper.ddd,0d);
    double return_ddd = e.getValue(ctx,Double.TYPE);
    assertEquals(1.0d,return_ddd,0d);
    assertEquals(1.0d,helper.ddd,0d);


    // float
    e = parser.parseExpression("--fff");
    assertEquals(3.0f,helper.fff,0d);
    float return_fff = e.getValue(ctx,Float.TYPE);
    assertEquals(2.0f,return_fff,0d);
    assertEquals(2.0f,helper.fff,0d);


    // long
    e = parser.parseExpression("--lll");
    assertEquals(66666L,helper.lll);
    long return_lll = e.getValue(ctx,Long.TYPE);
    assertEquals(66665L,return_lll);
    assertEquals(66665L,helper.lll);


    // int
    e = parser.parseExpression("--iii");
    assertEquals(42,helper.iii);
    int return_iii = e.getValue(ctx,Integer.TYPE);
    assertEquals(41,return_iii);
    assertEquals(41,helper.iii);
    return_iii = e.getValue(ctx,Integer.TYPE);
    assertEquals(40,return_iii);
    assertEquals(40,helper.iii);


    // short
    e = parser.parseExpression("--sss");
    assertEquals(15,helper.sss);
    int return_sss = (Integer)e.getValue(ctx);
    assertEquals(14,return_sss);
    assertEquals(14,helper.sss);
  }

View Full Code Here


  @Test
  public void decrement03() {
    Spr9751 helper = new Spr9751();
    StandardEvaluationContext ctx = new StandardEvaluationContext(helper);
    ExpressionParser parser = new SpelExpressionParser(new SpelParserConfiguration(true, true));
    Expression e = null;


    e = parser.parseExpression("m()--");
    try {
      e.getValue(ctx,Double.TYPE);
      fail();
    } catch (SpelEvaluationException see) {
      assertEquals(SpelMessage.OPERAND_NOT_DECREMENTABLE,see.getMessageCode());
    }


    e = parser.parseExpression("--m()");
    try {
      e.getValue(ctx,Double.TYPE);
      fail();
    } catch (SpelEvaluationException see) {
      assertEquals(SpelMessage.OPERAND_NOT_DECREMENTABLE,see.getMessageCode());

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