[jboss-jira] [JBoss JIRA] (JBRULES-3427) Wrong pattern's offsets calculation with complex LHS conditions

[Mario Fusco (JIRA)]

Mario Fusco created JBRULES-3427:
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             Summary: Wrong pattern's offsets calculation with complex LHS conditions
                 Key: JBRULES-3427
                 URL: https://issues.jboss.org/browse/JBRULES-3427
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
            Reporter: Mario Fusco
            Assignee: Mario Fusco


When combining AND and OR conditions in a complex LHS, the pattern's offsets is not calculated correctly leading to a NPE when trying to extract the object related with the wrong pattern from a tuple.

The following test reproduces the problem:

    @Test
    public void testPatternOffset() throws Exception {
        String str = "package org.drools.test; \n" +
                "declare A\n" +
                "end\n" +
                "declare B\n" +
                "   field : int\n" +
                "end\n" +
                "declare C\n" +
                "   field : int\n" +
                "end\n" +
                "rule R when\n" +
                "( " +
                "   A( ) or ( A( ) and B( ) ) " +
                ") and (\n" +
                "   A( ) or ( B( $bField : field ) and C( field != $bField ) )\n" +
                ")\n" +
                "then\n" +
                "    System.out.println(\"rule fired\");\n" +
                "end\n";

        KnowledgeBase kbase = loadKnowledgeBaseFromString( str );
        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();

        FactType typeA = kbase.getFactType( "org.drools.test", "A" );
        FactType typeB = kbase.getFactType( "org.drools.test", "B" );
        FactType typeC = kbase.getFactType( "org.drools.test", "C" );

        Object a = typeA.newInstance();
        ksession.insert( a );

        Object b = typeB.newInstance();
        typeB.set( b, "field", 1 );
        ksession.insert( b );

        Object c = typeC.newInstance();
        typeC.set( c, "field", 1 );
        ksession.insert( c );

        ksession.fireAllRules();
    }

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