| /* |
| * Copyright 2016-17, OpenCensus Authors |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package io.opencensus.internal; |
| |
| /** Internal utility methods for working with tag keys, tag values, and metric names. */ |
| public final class StringUtils { |
| |
| /** |
| * Determines whether the {@code String} contains only printable characters. |
| * |
| * @param str the {@code String} to be validated. |
| * @return whether the {@code String} contains only printable characters. |
| */ |
| public static boolean isPrintableString(String str) { |
| for (int i = 0; i < str.length(); i++) { |
| if (!isPrintableChar(str.charAt(i))) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| private static boolean isPrintableChar(char ch) { |
| return ch >= ' ' && ch <= '~'; |
| } |
| |
| private StringUtils() {} |
| } |