framework/tests/value/StartsEndsWith.java

// Tests string length refinement after startsWith or endsWith return true
// https://github.com/kelloggm/checker-framework/issues/56

import org.checkerframework.common.value.qual.ArrayLen;
import org.checkerframework.common.value.qual.MinLen;

public class StartsEndsWith {

  void refineStartsWith(String str) {
    if (str.startsWith("prefix")) {
      @MinLen(6) String s6 = str;
      // :: error: (assignment)
      @MinLen(7) String s7 = str;
    } else {
      // :: error: (assignment)
      @MinLen(6) String s6 = str;
    }
  }

  void refineEndsWith(String str) {
    if (str.endsWith("suffix")) {
      @MinLen(6) String s6 = str;
      // :: error: (assignment)
      @MinLen(7) String s7 = str;
    } else {
      // :: error: (assignment)
      @MinLen(6) String s6 = str;
    }
  }

  void refineStartsEndsWith(String str) {
    if (str.startsWith("longprefix") && str.endsWith("prefix")) {
      @MinLen(10) String s10 = str;
      // :: error: (assignment)
      @MinLen(11) String s11 = str;
    }
  }

  void refineStartsArrayLen(String str, @ArrayLen(10) String prefix) {
    if (str.startsWith(prefix)) {
      @MinLen(10) String sg10 = str;
      // :: error: (assignment)
      @ArrayLen(10) String s10 = str;
    }
  }

  void noRefinement(@ArrayLen(10) String str) {
    if (str.startsWith("x")) {
      @ArrayLen(10) String s10 = str;
    }
  }

  void refineStartsStaticFinal(String str) {
    if (str.startsWith(StartsEndsWithExternal.staticFinalField)) {
      @MinLen(3) String s3 = str;
    }
  }
}

class StartsEndsWithExternal {
  public static final String staticFinalField = "str";
}