/*
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* Copyright 2015 Orhan Obut
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This software contains code derived from the following Android classes:
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* android.util.Log, android.text.TextUtils.
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*/
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package com.moral.andbrickslib.utils.log;
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import java.io.PrintWriter;
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import java.io.StringWriter;
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import java.net.UnknownHostException;
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/**
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* Helper util class to be used instead of Android methods to avoid direct dependency and enable
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* unit testing on Android projects.
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*/
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final class Helper {
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private Helper() {
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// Hidden constructor.
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}
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/**
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* Returns true if the string is null or 0-length.
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*
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* @param str the string to be examined
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*
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* @return true if str is null or zero length
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*/
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static boolean isEmpty(CharSequence str) {
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return str == null || str.length() == 0;
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}
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/**
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* Returns true if a and b are equal, including if they are both null.
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* <p><i>Note: In platform versions 1.1 and earlier, this method only worked well if
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* both the arguments were instances of String.</i></p>
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*
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* @param a first CharSequence to check
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* @param b second CharSequence to check
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*
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* @return true if a and b are equal
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*
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* NOTE: Logic slightly change due to strict policy on CI -
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* "Inner assignments should be avoided"
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*/
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static boolean equals(CharSequence a, CharSequence b) {
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if (a == b) return true;
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if (a != null && b != null) {
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int length = a.length();
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if (length == b.length()) {
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if (a instanceof String && b instanceof String) {
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return a.equals(b);
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} else {
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for (int i = 0; i < length; i++) {
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if (a.charAt(i) != b.charAt(i)) return false;
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}
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return true;
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}
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}
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}
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return false;
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}
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/**
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* Copied from "android.util.Log.getStackTraceString()" in order to avoid usage of Android stack
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* in unit tests.
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*
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* @return Stack trace in form of String
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*/
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static String getStackTraceString(Throwable tr) {
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if (tr == null) {
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return "";
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}
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// This is to reduce the amount of log spew that apps do in the non-error
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// condition of the network being unavailable.
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Throwable t = tr;
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while (t != null) {
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if (t instanceof UnknownHostException) {
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return "";
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}
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t = t.getCause();
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}
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StringWriter sw = new StringWriter();
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PrintWriter pw = new PrintWriter(sw);
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tr.printStackTrace(pw);
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pw.flush();
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return sw.toString();
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}
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}
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