Apache CXF example source code file (StringUtils.java)

This example Apache CXF source code file (StringUtils.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Apache CXF tags/keywords

arraylist, io, list, list, malformedurlexception, malformedurlexception, matcher, net, network, pattern, regex, string, string, stringbuilder, stringutils, url, url, util

The Apache CXF StringUtils.java source code

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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 org.apache.cxf.common.util;

import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public final class StringUtils {

    private StringUtils() {
    }

    public static String extract(String string, String startToken, String endToken) {
        int start = string.indexOf(startToken) + startToken.length();
        int end = string.lastIndexOf(endToken);

        if (start == -1 || end == -1) {
            return null;
        }

        return string.substring(start, end);
    }

    public static String wrapper(String string, String startToken, String endToken) {
        StringBuilder sb = new StringBuilder();
        sb.append(startToken);
        sb.append(string);
        sb.append(endToken);
        return sb.toString();
    }

    public static boolean isFileExist(String file) {
        return new File(file).exists() && new File(file).isFile();
    }

    public static boolean isFileAbsolute(String file) {
        return isFileExist(file) && new File(file).isAbsolute();
    }

    public static URL getURL(String spec) throws MalformedURLException {
        try {
            return new URL(spec);
        } catch (MalformedURLException e) {
            return new File(spec).toURI().toURL();
        }
    }

    public static boolean isEmpty(String str) {
        if (str != null) {
            int len = str.length();
            for (int x = 0; x < len; ++x) {
                if (str.charAt(x) > ' ') {
                    return false;
                }
            }
        }
        return true;
    }
    
    public static boolean isEmpty(List<String> list) {
        if (list == null || list.size() == 0) {
            return true;
        }
        if (list.size() == 1 && isEmpty(list.get(0))) {
            return true;
        }
        return false;
    }

    public static boolean isEqualUri(String uri1, String uri2) {

        if (uri1.substring(uri1.length() - 1).equals("/") && !uri2.substring(uri2.length() - 1).equals("/")) {
            return uri1.substring(0, uri1.length() - 1).equals(uri2);
        } else if (uri2.substring(uri2.length() - 1).equals("/")
                   && !uri1.substring(uri1.length() - 1).equals("/")) {
            return uri2.substring(0, uri2.length() - 1).equals(uri1);
        } else {
            return uri1.equals(uri2);
        }
    }
    
    public static String diff(String str1, String str2) {
        int index = str1.lastIndexOf(str2);
        if (index > -1) {
            return str1.substring(str2.length());
        }
        return str1;
    }
    
    public static List<String> getParts(String str, String sperator) {
        List<String> ret = new ArrayList();
        List<String> parts = Arrays.asList(str.split("/"));
        for (String part : parts) {
            if (!isEmpty(part)) {
                ret.add(part);
            }
        }
        return ret;
    }
    
    public static String getFirstNotEmpty(String str, String sperator) {
        List<String> parts = Arrays.asList(str.split("/"));
        for (String part : parts) {
            if (!isEmpty(part)) {
                return part;
            }
        }
        return str;
    }
    
    public static String getFirstNotEmpty(List<String> list) {
        if (isEmpty(list)) {
            return null;
        }
        for (String item : list) {
            if (!isEmpty(item)) {
                return item;
            }       
        }
        return null;
    }
    
    public static List<String> getFound(String contents, String regex) {
        if (isEmpty(regex) || isEmpty(contents)) {
            return null;
        }
        List<String> results = new ArrayList();
        Pattern pattern = Pattern.compile(regex, Pattern.UNICODE_CASE);
        Matcher matcher = pattern.matcher(contents);
        
        while (matcher.find()) {
            if (matcher.groupCount() > 0) {
                results.add(matcher.group(1));
            } else {
                results.add(matcher.group());
            }
        }
        return results;
    } 
    
    public static String getFirstFound(String contents, String regex) {
        List<String> founds = getFound(contents, regex);
        if (isEmpty(founds)) {
            return null;
        }
        return founds.get(0);
    }
    
    public static String formatVersionNumber(String target) {
        List<String> found = StringUtils.getFound(target, "\\d+\\.\\d+\\.?\\d*");
        if (isEmpty(found)) {
            return target;
        }
        return getFirstNotEmpty(found);
    }
    
    public static String addDefaultPortIfMissing(String urlString) {
        return addDefaultPortIfMissing(urlString, "80");
    }
    
    public static String addDefaultPortIfMissing(String urlString, String defaultPort) {
        URL url = null;
        try {
            url = new URL(urlString);
        } catch (MalformedURLException e) {
            return urlString;
        }
        if (url.getPort() != -1) {
            return urlString;
        }
        String regex = "http://([^/]+)";        
        String found = StringUtils.getFirstFound(urlString, regex);
        String replacer = "http://" + found + ":" + defaultPort;
        
        if (!StringUtils.isEmpty(found)) {
            urlString = urlString.replaceFirst(regex, replacer);
        }                
        return urlString;
    }
 
    /**
     * Return input string with first character in upper case.
     * @param name input string.
     * @return capitalized form.
     */
    public static String capitalize(String name) {
        if (name == null || name.length() == 0) {
            return name;
        }
        char chars[] = name.toCharArray();
        chars[0] = Character.toUpperCase(chars[0]);
        return new String(chars);
    }
    
    public static String uncapitalize(String str) {
        if (str == null || str.length() == 0) {
            return str;
        }
        return new StringBuilder(str.length())
            .append(Character.toLowerCase(str.charAt(0)))
            .append(str.substring(1))
            .toString();
    }    
}