liquibase-core/src/main/java/liquibase/util/StringClauses.java
private String uniqueKey(String key) {
        boolean generateOne = false;

        key = StringUtil.trimToNull(key);
        if (key == null) {
            generateOne = true;
        } else if (clauses.containsKey(key.toLowerCase())) {
            generateOne = true;
        }

        while (generateOne) {
            key = StringUtil.leftPad(new BigInteger(50, random).toString(32), 6).replace(" ", "0").substring(0,6);
            generateOne = clauses.containsKey(key);
        }
        return key;
    }
private String uniqueKey(String key) {
        boolean generateOne = false;

        key = StringUtil.trimToNull(key);
        if (key == null) {
            generateOne = true;
        } else if (clauses.containsKey(key.toLowerCase())) {
            generateOne = true;
        }

        while (generateOne) {
            key = StringUtil.leftPad(new BigInteger(50, random).toString(32), 6).replace(" ", "0").substring(0,6);
            generateOne = clauses.containsKey(key);
        }
        return key;
    }
private String uniqueKey ( String key ) { boolean generateOne = false ; key = StringUtil . trimToNull ( key ) ; if ( key == null ) { generateOne = true ; } else if ( clauses . containsKey ( key . toLowerCase ( ) ) ) { generateOne = true ; } while ( generateOne ) { key = StringUtil . leftPad ( new BigInteger ( 50 , random ) . toString ( 32 ) , 6 ) . replace ( " " , "0" ) . substring ( 0 , 6 ) ; generateOne = clauses . containsKey ( key ) ; } return key ; }
Returns the key if it is not empty and/or not already used. If it is already used, it generates a random value for the key.
Returns the key if it is not empty and / or not already used . If it is already used it generates a random value for the key .