Precondition.java

import org.checkerframework.dataflow.qual.Pure;
import org.checkerframework.framework.qual.RequiresQualifier;
import org.checkerframework.framework.qual.RequiresQualifiers;
import org.checkerframework.framework.test.*;
import testlib.util.*;

// various tests for the precondition mechanism
class Precondition {

    String f1, f2, f3;
    Precondition p;

    @RequiresQualifier(expression = "f1", qualifier = Odd.class)
    void requiresF1() {
        //:: error: (assignment.type.incompatible)
        @Value String l1 = f1;
        @Odd String l2 = f1;
    }

    @Pure
    @RequiresQualifier(expression = "f1", qualifier = Odd.class)
    int requiresF1AndPure() {
        //:: error: (assignment.type.incompatible)
        @Value String l1 = f1;
        @Odd String l2 = f1;
        return 1;
    }

    @RequiresQualifier(expression = "f1", qualifier = Value.class)
    void requiresF1Value() {
        //:: error: (assignment.type.incompatible)
        @Odd String l1 = f1;
        @Value String l2 = f1;
    }

    @RequiresQualifier(expression = "---", qualifier = Odd.class)
    //:: error: (flowexpr.parse.error)
    void error() {
        //:: error: (assignment.type.incompatible)
        @Value String l1 = f1;
        //:: error: (assignment.type.incompatible)
        @Odd String l2 = f1;
    }

    @RequiresQualifier(expression = "#1", qualifier = Odd.class)
    void requiresParam(String p) {
        //:: error: (assignment.type.incompatible)
        @Value String l1 = p;
        @Odd String l2 = p;
    }

    @RequiresQualifier(
        expression = {"#1", "#2"},
        qualifier = Odd.class
    )
    void requiresParams(String p1, String p2) {
        //:: error: (assignment.type.incompatible)
        @Value String l1 = p1;
        //:: error: (assignment.type.incompatible)
        @Value String l2 = p2;
        @Odd String l3 = p1;
        @Odd String l4 = p2;
    }

    @RequiresQualifier(expression = "#1", qualifier = Odd.class)
    //:: error: (flowexpr.parse.index.too.big)
    void param3() {}

    void t1(@Odd String p1, String p2) {
        //:: error: (contracts.precondition.not.satisfied)
        requiresF1();
        //:: error: (contracts.precondition.not.satisfied)
        requiresF1Value();
        //:: error: (contracts.precondition.not.satisfied)
        requiresParam(p2);
        //:: error: (contracts.precondition.not.satisfied)
        requiresParams(p1, p2);
    }

    void t2(@Odd String p1, String p2) {
        f1 = p1;
        requiresF1();
        //:: error: (contracts.precondition.not.satisfied)
        requiresF1();
        //:: error: (contracts.precondition.not.satisfied)
        requiresF1Value();
    }

    void t3(@Odd String p1, String p2) {
        f1 = p1;
        requiresF1AndPure();
        requiresF1AndPure();
        requiresF1AndPure();
        requiresF1();
        //:: error: (contracts.precondition.not.satisfied)
        requiresF1();
    }

    void t4(@Odd String p1, String p2, @Value String p3) {
        f1 = p1;
        requiresF1();
        f1 = p3;
        requiresF1Value();
        requiresParam(p1);
        requiresParams(p1, p1);
    }

    class Inner {
        @RequiresQualifier(expression = "f1", qualifier = Odd.class)
        void foo() {}
    }

    @Odd String f4;

    @RequiresQualifier(expression = "f4", qualifier = Odd.class)
    void requiresF4() {}

    void tt1() {
        requiresF4();
    }

    /** *** multiple preconditions ***** */
    @RequiresQualifiers({
        @RequiresQualifier(expression = "f1", qualifier = Value.class),
        @RequiresQualifier(expression = "f2", qualifier = Odd.class)
    })
    void multi() {
        @Value String l1 = f1;
        @Odd String l2 = f2;
        //:: error: (assignment.type.incompatible)
        @Value String l3 = f2;
        //:: error: (assignment.type.incompatible)
        @Odd String l4 = f1;
    }

    @RequiresQualifiers({@RequiresQualifier(expression = "--", qualifier = Value.class)})
    //:: error: (flowexpr.parse.error)
    void error2() {}

    void t5(@Odd String p1, String p2, @Value String p3) {
        //:: error: (contracts.precondition.not.satisfied)
        multi();
        f1 = p3;
        //:: error: (contracts.precondition.not.satisfied)
        multi();
        f1 = p3;
        f2 = p1;
        multi();

        //:: error: (flowexpr.parse.error)
        error2();
    }
}