История изменений

//java
Class Ret<T> {
    private boolean error = false;
    private T ret;
    public Ret(T default) {
        ret = default;
    }
    public boolean ok() {
        return error == false;
    }
    public Ret<T> err() {
        ret = null;
        error = true;
        return this;
    }
    public val() {
       return ret;
    }
    public Ret<T> set(T val) {
       ret = val;
       return this;
    }
    
}
//...
Ret<Integer> someMethod() {
    Ret<Integer> ret = new Ret<Integer>(null);
    //...
    Ret<Long> localVarRaw2 = someMethod2(a1, a2);
    if (!localVarRaw2.ok()) return ret.err();
    Long localVar2 = localVarRaw2.val();
    //...
    Ret<String> localVarRaw3 = someMethod3(a1, a2, localVar2);
    if (!localVarRaw3.ok()) return ret.err();
    Long localVar3 = localVarRaw3.val();
    //...
    return ret.set(localVar10);
}

Ret<Long> someMethod2() {
    Ret<Long> ret = new Ret<Long>(null);
    //...
    if (allIsBad) return ret.err();
    //...
    return ret.set(retValue);
}
//etc

Integer someMethod() {
   Integer ret = null;
   try {
      //...
      Long localVar2 = someMethod2(a1, a2);
      //...
      String localVar3 = someMethod3(a1, a2, localVar2);
   } catch (Exception e) {
      //exception code or another throw
   }
   return ret;
}

//java
Class Ret<T> {
    private boolean error = false;
    private T ret;
    public Ret(T default) {
        ret = default;
    }
    public boolean ok() {
        return error == false;
    }
    public Ret<T> err() {
        ret = null;
        error = true;
        return this;
    }
    public val() {
       return ret;
    }
    public Ret<T> set(T val) {
       ret = val;
       return this;
    }
    
}
//...
Ret<Integer> someMethod() {
    Ret<Integer> ret = new Ret<Integer>(null);
    //...
    Ret<Long> localVarRaw2 = someMethod2(a1, a2);
    if (!localVarRaw2.ok()) return ret.err();
    Long localVar2 = localVarRaw2.val();
    //...
    Ret<String> localVarRaw3 = someMethod3(a1, a2, localVar2);
    if (!localVarRaw3.ok()) return ret.err();
    Long localVar3 = localVarRaw3.val();
    //...
    return ret.set(localVar10);
}

Ret<Long> someMethod2() {
    Ret<Long> ret = new Ret<Long>(null);
    //...
    if (allIsBad) return ret.err();
    //...
    return ret.set(retValue);
}
//etc

Integer someMethod() {
   Integer ret = null;
   try {
      //...
      Long localVar2 = someMethod2(a1, a2);
      //...
      String localVar3 = someMethod3(a1, a2, localVar2);
   } catch (Exception e) {
      //exception code or another throw
   }
   return ret;
}