Package org.drools.lang.descr

Examples of org.drools.lang.descr.ConstraintConnectiveDescr

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    @SuppressWarnings("unchecked")
    private ConstraintConnectiveDescr parseExpression( final RuleBuildContext context,
                                                       final PatternDescr patternDescr,
                                                       final String expression ) {
        DrlExprParser parser = new DrlExprParser();
        ConstraintConnectiveDescr result = parser.parse( expression );
        if ( result == null || parser.hasErrors() ) {
            for ( DroolsParserException error : parser.getErrors() ) {
                context.getErrors().add( new DescrBuildError( context.getParentDescr(),
                                                              patternDescr,
                                                              null,
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            String expression = null;
            boolean isPositional = false;
            boolean isBinding = false;
            BindingDescr bind = null;
            ConstraintConnectiveDescr result = null;
            if ( base instanceof BindingDescr ) {
                bind = (BindingDescr) base;
                expression = bind.getVariable() + (bind.isUnification() ? " := " : " : ") + bind.getExpression();
                isBinding = true;
            } else {
                if ( base instanceof ExprConstraintDescr ) {
                    ExprConstraintDescr ecd = (ExprConstraintDescr) base;
                    expression = ecd.getExpression();
                    isPositional = ecd.getType() == ExprConstraintDescr.Type.POSITIONAL;

                } else {
                    expression = base.getText();
                }

                result = parseExpression( context,
                                          patternDescr,
                                          expression );
                if ( result == null ) {
                    // error, can't parse expression.
                    context.getErrors().add( new DescrBuildError( context.getParentDescr(),
                                                                  descr,
                                                                  null,
                                                                  "Unable to parse constraint: \n" + expression ) );
                    continue;
                }
                isBinding = result.getDescrs().size() == 1 && result.getDescrs().get( 0 ) instanceof BindingDescr;
                if ( isBinding ) {
                    bind = (BindingDescr) result.getDescrs().get( 0 );
                }
            }

            if ( (!isPositional) && (!isBinding) ) {
                // error, can't have non binding slots.
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                requiredDeclarations.add( declr );
            } else {
                // it must be a literal/expression
                // it's an expression and thus an input
                DrlExprParser parser = new DrlExprParser();
                ConstraintConnectiveDescr bresult = parser.parse( bind.getExpression() );
                if ( parser.hasErrors() ) {
                    for ( DroolsParserException error : parser.getErrors() ) {
                        context.getErrors().add( new DescrBuildError( context.getParentDescr(),
                                                                      descr,
                                                                      null,
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    @SuppressWarnings("unchecked")
    private ConstraintConnectiveDescr parseExpression( final RuleBuildContext context,
                                                       final PatternDescr patternDescr,
                                                       final String expression ) {
        DrlExprParser parser = new DrlExprParser();
        ConstraintConnectiveDescr result = parser.parse( expression );
        if ( result == null || parser.hasErrors() ) {
            for ( DroolsParserException error : parser.getErrors() ) {
                context.getErrors().add( new DescrBuildError( context.getParentDescr(),
                                                              patternDescr,
                                                              null,
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    @Test
    public void testDump() throws Exception {
        String input = "price > 10 && < 20 || == $val || == 30";
        String expected = "( price > 10 && price < 20 || price == $val || price == 30 )";

        ConstraintConnectiveDescr descr = parse( input );
        String result = dumper.dump( descr );

        assertEquals( expected,
                      result );
    }
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    @Test
    public void testDumpMatches() throws Exception {
        String input = "type.toString matches \"something\\swith\\tsingle escapes\"";
        String expected = "type.toString ~= \"something\\swith\\tsingle escapes\"";

        ConstraintConnectiveDescr descr = parse( input );
        String result = dumper.dump( descr );

        assertEquals( expected,
                      result );
    }
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    @Test
    public void testDumpMatches2() throws Exception {
        String input = "type.toString matches 'something\\swith\\tsingle escapes'";
        String expected = "type.toString ~= \"something\\swith\\tsingle escapes\"";

        ConstraintConnectiveDescr descr = parse( input );
        String result = dumper.dump( descr );

        assertEquals( expected,
                      result );
    }
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    @Test
    public void testDumpMatches3() throws Exception {
        String input = "this[\"content\"] matches \"hello ;=\"";
        String expected = "this[\"content\"] ~= \"hello ;=\"";

        ConstraintConnectiveDescr descr = parse( input );
        String result = dumper.dump( descr );

        assertEquals( expected,
                      result );
    }
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    @Test
    public void testDumpContains() throws Exception {
        String input = "list contains \"b\"";
        String expected = "list contains \"b\"";

        ConstraintConnectiveDescr descr = parse( input );
        String result = dumper.dump( descr );

        assertEquals( expected,
                      result );
    }
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    @Test
    public void testDumpContains2() throws Exception {
        String input = "list not contains \"b\"";
        String expected = "!( list contains \"b\" )";

        ConstraintConnectiveDescr descr = parse( input );
        String result = dumper.dump( descr );

        assertEquals( expected,
                      result );
    }
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Related Classes of org.drools.lang.descr.ConstraintConnectiveDescr

  • org.drools.compiler.DrlExprParser
  • org.drools.lang.DRL5Expressions
  • org.drools.lang.DRL6Expressions
  • org.drools.lang.DRLExpressions
  • org.drools.lang.DRLExprParserTest
  • org.drools.lang.DRLExprTreeTest
  • org.drools.lang.MVELDumper
  • org.drools.lang.MVELDumperTest
  • org.drools.rule.builder.PatternBuilder
  • org.drools.rule.builder.QueryElementBuilder
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