com.github.caldav4j.util.UrlUtils.java Source code

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Here is the source code for com.github.caldav4j.util.UrlUtils.java

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/*
 * Copyright 2007 Open Source Applications Foundation
 * Copyright  2018 Ankush Mishra, Roberto Polli
 *
 * 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 com.github.caldav4j.util;

import org.apache.http.Header;
import org.apache.http.HttpResponse;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;

/**
 * Contains the Utility functions for URLs
 */
public class UrlUtils {

    /**
     * Strip hosts from the href.
     *
     * @param href Link to remove the host from
     * @return Stripped string.
     */
    public static String stripHost(String href) {
        if (!href.startsWith("http")) {
            return href;
        }
        int indexOfColon = href.indexOf(":");
        int index = href.indexOf("/", indexOfColon + 3);
        return href.substring(index);
    }

    /**
     * Remove Double Slashes from given string.
     *
     * @param s Input String
     * @return String with Double Slashes removed.
     */
    public static String removeDoubleSlashes(String s) {
        return s.replaceAll("([^:])/{2,}", "$1/");
    }

    public static String ensureTrailingSlash(String s) {
        return (s.endsWith("/")) ? s : s.concat("/");
    }

    /**
     * Return the Value of the Header
     *
     * @param response     HTTP Response
     * @param headerName Name of header
     * @return Value of header
     */
    public static String getHeaderPrettyValue(HttpResponse response, String headerName) {
        if (response != null && headerName != null) {
            Header header = response.getFirstHeader(headerName);
            if (header != null) {
                return header.getValue();
            }
        }

        return null;
    }

    /**
     * Parse {@link InputStream} to String
     * @param is {@link InputStream} object
     * @return String from the object
     */
    public static String parseISToString(InputStream is) {
        StringBuffer sb = new StringBuffer();
        try (InputStream inputStream = is) {
            BufferedReader din = new BufferedReader(new InputStreamReader(inputStream));

            String line = null;
            while ((line = din.readLine()) != null) {
                sb.append(line);
                sb.append("\n");
            }
        } catch (Exception ex) {
            ex.getMessage();
        }

        return sb.toString();
    }

    /**
     * Compare two strings without while ignoring their case.
     *
     * @param str1 String 1
     * @param str2 String 2
     * @return True if equal
     */
    public static boolean equalsIgnoreCase(String str1, String str2) {
        return (str1 == null ? str2 == null : str1.equalsIgnoreCase(str2));
    }

    /**
     * @param str String to check.
     * @param defaultStr Default String.
     * @return Returns default string if string is null.
     */
    public static String defaultString(String str, String defaultStr) {
        return (str == null ? defaultStr : str);
    }

    /**
     * Checks if given String is blank.
     * @param str String to check
     * @return True if blank.
     */
    public static boolean isBlank(String str) {
        return (str == null || (str.length()) == 0 || "".equals(str.trim()));
    }

    /**
     * Checks if given String is not blank.
     * @param str String to check
     * @return True if not blank.
     */
    public static boolean isNotBlank(String str) {
        return !isBlank(str);
    }

}