本文整理了Java中org.javalite.common.Util.blank()方法的一些代码示例，展示了Util.blank()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Util.blank()方法的具体详情如下：
包路径：org.javalite.common.Util
类名称：Util
方法名：blank

Util.blank介绍

[英]Returns true if value is either null or it's String representation is blank.
[中]如果值为null或其字符串表示形式为空，则返回true。

代码示例

代码示例来源：origin: javalite/activejdbc

/**
   * @param source instance of String
   * @return null if source is empty or contains only whitespaces, source otherwise
   */
  @Override
  public Object convert(String source) {
    return blank(source) ? null : source;
  }
}

代码示例来源：origin: javalite/activejdbc

/**
   * @param source instance of String or null
   * @return source converted to java.sql.Date, or null if source is blank
   * @throws ParseException if conversion failed
   */
  @Override
  public java.sql.Date doConvert(String source) throws ParseException {
    return blank(source) ? null : new java.sql.Date(threadLocalFormat.get().parse(source).getTime());
  }
}

代码示例来源：origin: javalite/activejdbc

/**
   * @param source instance of String or null
   * @return source converted to java.sql.Timestamp, or null if source is blank
   * @throws ParseException if conversion failed
   */
  @Override
  public java.sql.Timestamp doConvert(String source) throws ParseException {
    return blank(source) ? null : new java.sql.Timestamp(threadLocalFormat.get().parse(source).getTime());
  }
}

代码示例来源：origin: javalite/activejdbc

/**
 * @return current environment as specified by environment variable <code>ACTIVE_ENV</code>
 * of <code>active_env</code> system property. System property value overrides environment variable.
 *
 * Defaults to "development" if no environment variable provided.
 */
public String getEnvironment(){
  String env = "development";
  if(!blank(System.getenv("ACTIVE_ENV"))){
    env = System.getenv("ACTIVE_ENV");
  }
  if(!blank(System.getProperty("active_env"))){
    env = System.getProperty("active_env");
  }
  return env;
}

代码示例来源：origin: javalite/activejdbc

protected void appendSubQuery(StringBuilder queryBuilder, String subQuery) {
  if (!blank(subQuery)) {
    // this is only to support findFirst("order by..."), might need to revisit later
    if (!GROUP_BY_PATTERN.matcher(subQuery).find() && !ORDER_BY_PATTERN.matcher(subQuery).find()) {
      queryBuilder.append(" WHERE");
    }
    queryBuilder.append(' ').append(subQuery);
  }
}

代码示例来源：origin: javalite/activejdbc

/**
 * Returns name of environment, such as "development", "production", etc.
 * This is a value that is usually setup with an environment variable <code>ACTIVE_ENV</code>.
 *
 * @return name of environment
 */
public static String getEnv(){
  if(ENV == null){
    if(!blank(System.getenv("ACTIVE_ENV"))) {
      ENV = System.getenv("ACTIVE_ENV");
    }
    if(!blank(System.getProperty("ACTIVE_ENV"))) {
      ENV = System.getProperty("ACTIVE_ENV");
    }
    if(!blank(System.getProperty("active_env"))) {
      ENV = System.getProperty("active_env");
    }
    if(blank(ENV)){
      ENV = "development";
      LogFilter.log(LOGGER, LogLevel.INFO, "Environment variable ACTIVE_ENV not provided, defaulting to '" + ENV + "'");
    }
  }
  return ENV;
}

代码示例来源：origin: javalite/activejdbc

/**
 * Overrides current environment's connection spec from system properties.
 */
private void overrideFromEnvironmentVariables() {
  String  url = System.getenv("ACTIVEJDBC.URL");
  String  user = System.getenv("ACTIVEJDBC.USER");
  String  password = System.getenv("ACTIVEJDBC.PASSWORD");
  String  driver = System.getenv("ACTIVEJDBC.DRIVER");
  if(!blank(url) && !blank(user) && !blank(password) && !blank(driver)){
    connectionSpecMap.put(getEnvironment(), new ConnectionJdbcSpec(driver, url, user, password));
  }
  String  jndi = System.getenv("ACTIVEJDBC.JNDI");
  if(!blank(jndi)){
    connectionSpecMap.put(getEnvironment(), new ConnectionJndiSpec(jndi));
  }
}

代码示例来源：origin: javalite/activejdbc

/**
 * Overrides current environment's connection spec from system properties.
 */
private void overrideFromSystemProperties() {
  String  url = System.getProperty("activejdbc.url");
  String  user = System.getProperty("activejdbc.user");
  String  password = System.getProperty("activejdbc.password");
  String  driver = System.getProperty("activejdbc.driver");
  if(!blank(url) && !blank(user) && !blank(driver)){
    connectionSpecMap.put(getEnvironment(), new ConnectionJdbcSpec(driver, url, user, password));
  }
  String  jndi = System.getProperty("activejdbc.jndi");
  if(!blank(jndi)){
    connectionSpecMap.put(getEnvironment(), new ConnectionJndiSpec(jndi));
  }
}

代码示例来源：origin: javalite/activejdbc

/**
 * TDS converts a number of important data types to String. This isn't what we want, nor helpful. Here, we change them back.
 */
@Override
public Object overrideDriverTypeConversion(MetaModel mm, String attributeName, Object value) {
  if (value instanceof String && !Util.blank(value)) {
    String typeName = mm.getColumnMetadata().get(attributeName).getTypeName();
    if ("date".equalsIgnoreCase(typeName)) {
      return java.sql.Date.valueOf((String) value);
    } else if ("datetime2".equalsIgnoreCase(typeName)) {
      return java.sql.Timestamp.valueOf((String) value);
    }
  }
  return value;
}

代码示例来源：origin: javalite/activejdbc

public RedisCacheManager() {
  try {
    String host = p("redis.cache.manager.host");
    String port = p("redis.cache.manager.port");
    jedisPool = blank(host) || blank(port) ? new JedisPool() : new JedisPool(host,toInteger(port));
  } catch (Exception e) {
    throw new InitException("Failed to configure connection to Redis server", e);
  }
}

代码示例来源：origin: javalite/activejdbc

@Override
public void convert(Model m) {
  Object val = m.get(attributeName);
  if (!(val instanceof java.util.Date) && !blank(val)) {
    try {
      long time = df.parse(val.toString()).getTime();
      java.sql.Date d = new java.sql.Date(time);
      m.set(attributeName, d);
    } catch (ParseException e) {
      m.addValidator(this, attributeName);
    }
  }
}

代码示例来源：origin: javalite/activejdbc

@Override
public void convert(Model m) {
  Object val = m.get(attributeName);
  if (!(val instanceof Timestamp) && !blank(val)) {
    try {
      long time = df.parse(val.toString()).getTime();
      Timestamp t = new Timestamp(time);
      m.set(attributeName, t);
    } catch(ParseException e) {
      m.addValidator(this, attributeName);
    }
  }
}

代码示例来源：origin: javalite/activejdbc

@Override
public void validate(Model m) {
  if (blank(m.get(attribute))) {
    //TODO: use resource bundles for messages
    m.addValidator(this, attribute);
  }
}

代码示例来源：origin: javalite/activejdbc

for (String line : lines) {
  line = line.trim();
  if (!commentLine(line) && !blank(line)) {
    if (line.startsWith(DELIMITER_KEYWORD)) {
      delimiter = line.substring(10).trim();
    } else if (line.endsWith(delimiter)) {
      currentStatement += line.substring(0, line.length() - delimiter.length()) ;
      if(!blank(currentStatement)){
        statements.add(currentStatement);
if(!blank(currentStatement)){
  statements.add(currentStatement);

代码示例来源：origin: javalite/activejdbc

break;
case XMLStreamConstants.END_ELEMENT:
  if (attr != null && !blank(chars)) {
    res.put(attr, chars);

代码示例来源：origin: javalite/activejdbc

private static String exec(String command) {

    Runtime runtime = Runtime.getRuntime();

    try {

      Process p = runtime.exec(command);
      String output = read(p.getInputStream());
      String error = read(p.getErrorStream());

      if (!blank(error)) {
        throw new ExecException(error);
      }
      return output;
    } catch (ExecException e) {
      throw e;
    } catch (Exception e) {
      throw new ExecException(e);
    }
  }
}

代码示例来源：origin: javalite/activejdbc

@Override
public Object overrideDriverTypeConversion(MetaModel mm, String attributeName, Object value) {
  // SQLite returns DATE and DATETIME as String or Number values
  if (value instanceof String && !Util.blank(value) || value instanceof Number) {
    String typeName = mm.getColumnMetadata().get(attributeName).getTypeName();
    if ("DATE".equalsIgnoreCase(typeName)) {
      return Convert.toSqlDate(value);
    } else if ("DATETIME".equalsIgnoreCase(typeName)) {
      return Convert.toTimestamp(value);
    } else if ("TIME".equalsIgnoreCase(typeName)) {
      return Convert.toTime(value);
    }
  }
  return value;
}

代码示例来源：origin: javalite/activejdbc

private static int update(MetaModel metaModel, String updates, String conditions, Object... params) {
  StringBuilder sql = new StringBuilder().append("UPDATE ").append(metaModel.getTableName()).append(" SET ");
  Object[] allParams;
  if (metaModel.hasAttribute("updated_at")) {
    sql.append("updated_at = ?, ");
    allParams = new Object[params.length + 1];
    allParams[0] = new Timestamp(System.currentTimeMillis());
    System.arraycopy(params, 0, allParams, 1, params.length);
  } else {
    allParams = params;
  }
  sql.append(updates);
  if (!blank(conditions)) {
    sql.append(" WHERE ").append(conditions);
  }
  int count = new DB(metaModel.getDbName()).exec(sql.toString(), allParams);
  if (metaModel.cached()) {
    Registry.cacheManager().purgeTableCache(metaModel);
  }
  return count;
}

代码示例来源：origin: com.github.tchoulihan/activejdbc

/**
   * @param source instance of String or null
   * @return source converted to java.sql.Date, or null if source is blank
   * @throws ParseException if conversion failed
   */
  @Override
  public java.sql.Date doConvert(String source) throws ParseException {
    return blank(source) ? null : new java.sql.Date(threadLocalFormat.get().parse(source).getTime());
  }
}

代码示例来源：origin: org.javalite/activejdbc

protected void appendSubQuery(StringBuilder queryBuilder, String subQuery) {
  if (!blank(subQuery)) {
    // this is only to support findFirst("order by..."), might need to revisit later
    if (!GROUP_BY_PATTERN.matcher(subQuery).find() && !ORDER_BY_PATTERN.matcher(subQuery).find()) {
      queryBuilder.append(" WHERE");
    }
    queryBuilder.append(' ').append(subQuery);
  }
}