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import org.checkerframework.checker.nullness.qual.*;
import org.checkerframework.checker.nullness.qual.EnsuresNonNullIf;
public class AssertIfChecked {
boolean unknown = false;
@Nullable Object value;
@EnsuresNonNullIf(result = true, expression = "value")
// :: error: (contracts.conditional.postcondition.invalid.returntype)
public void badform1() {}
@EnsuresNonNullIf(result = true, expression = "value")
// :: error: (contracts.conditional.postcondition.invalid.returntype)
public Object badform2() {
return new Object();
}
@EnsuresNonNullIf(result = false, expression = "value")
// :: error: (contracts.conditional.postcondition.invalid.returntype)
public void badform3() {}
@EnsuresNonNullIf(result = false, expression = "value")
// :: error: (contracts.conditional.postcondition.invalid.returntype)
public Object badform4() {
return new Object();
}
@EnsuresNonNullIf(result = true, expression = "value")
public boolean goodt1() {
return value != null;
}
@EnsuresNonNullIf(result = true, expression = "value")
public boolean badt1() {
// :: error: (contracts.conditional.postcondition.not.satisfied)
return value == null;
}
@EnsuresNonNullIf(result = false, expression = "value")
public boolean goodf1() {
return value == null;
}
@EnsuresNonNullIf(result = false, expression = "value")
public boolean badf1() {
// :: error: (contracts.conditional.postcondition.not.satisfied)
return value != null;
}
@EnsuresNonNullIf(result = true, expression = "value")
public boolean bad2() {
// :: error: (contracts.conditional.postcondition.not.satisfied)
return value == null || unknown;
}
@EnsuresNonNullIf(result = false, expression = "value")
public boolean bad3() {
// :: error: (contracts.conditional.postcondition.not.satisfied)
return value == null && unknown;
}
@EnsuresNonNullIf(result = true, expression = "#1")
boolean testParam(final @Nullable Object param) {
return param != null;
}
@EnsuresNonNullIf(result = true, expression = "#1")
boolean testLitTTgood1(final @Nullable Object param) {
if (param == null) {
return false;
}
return true;
}
@EnsuresNonNullIf(result = true, expression = "#1")
boolean testLitTTbad1(final @Nullable Object param) {
// :: error: (contracts.conditional.postcondition.not.satisfied)
return true;
}
@EnsuresNonNullIf(result = false, expression = "#1")
boolean testLitFFgood1(final @Nullable Object param) {
return true;
}
@EnsuresNonNullIf(result = false, expression = "#1")
boolean testLitFFgood2(final @Nullable Object param) {
if (param == null) {
return true;
}
return false;
}
@EnsuresNonNullIf(result = false, expression = "#1")
boolean testLitFFbad1(final @Nullable Object param) {
if (param == null) {
// :: error: (contracts.conditional.postcondition.not.satisfied)
return false;
}
return true;
}
@EnsuresNonNullIf(result = false, expression = "#1")
boolean testLitFFbad2(final @Nullable Object param) {
// :: error: (contracts.conditional.postcondition.not.satisfied)
return false;
}
@Nullable Object getValueUnpure() {
return value;
}
@org.checkerframework.dataflow.qual.Pure
@Nullable Object getValuePure() {
return value;
}
@EnsuresNonNullIf(result = true, expression = "getValuePure()")
public boolean hasValuePure() {
return getValuePure() != null;
}
@EnsuresNonNullIf(result = true, expression = "#1")
public static final boolean isComment(@Nullable String s) {
return s != null && (s.startsWith("//") || s.startsWith("#"));
}
@EnsuresNonNullIf(result = true, expression = "#1")
public boolean myEquals(@Nullable Object o) {
return (o instanceof String) && equals((String) o);
}
/*
* The next two methods are from Daikon's class Quant. They verify that
* EnsuresNonNullIf is correctly added to the assumptions after a check.
*/
@EnsuresNonNullIf(
result = true,
expression = {"#1", "#2"})
/* pure */ public static boolean sameLength(
boolean @Nullable [] seq1, boolean @Nullable [] seq2) {
return ((seq1 != null) && (seq2 != null) && seq1.length == seq2.length);
}
/* pure */ public static boolean isReverse(
boolean @Nullable [] seq1, boolean @Nullable [] seq2) {
if (!sameLength(seq1, seq2)) {
return false;
}
// This assert is not needed for inference.
// assert seq1 != null && seq2 != null; // because sameLength() = true
int length = seq1.length;
for (int i = 0; i < length; i++) {
if (seq1[i] != seq2[length - i - 1]) {
return false;
}
}
return true;
}
}
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