Using Guava Splitter and Joiner

In my last post: Solr RssResponseWriter by Extending XMLWriter, I need parse the field mapping string like: topic:title,url:link,description:description to a map.

If we have to write our own code, the code would look like below:
public void splitOnOurOwn() {
 String mapStr = "topic: title, url: link, description: description ";
 String[] pairs = mapStr.split(",");
 Map<String,String> map = new HashMap<String,String>();
 for (String pair : pairs) {
  String[] str = pair.split(":");
  map.put(str[0].trim(), str[1].trim());
 }
 System.out.println("toString: " + Objects.toString(map));
}
But if we use Guava it would be just two lines:

private static MapSplitter splitter = Splitter.on(",").trimResults()
  .withKeyValueSeparator(Splitter.on(':').trimResults());
private static MapJoiner joinner = Joiner.on(",").withKeyValueSeparator(":");

public void guavaSplit() {
 String mapStr = "topic: title, url: link, description: description ";
 Map<String,String> map = splitter.split(mapStr.trim());
 System.out.println("toString: " + Objects.toString(map));
 System.out.println("join: " + joinner.join(map));
}
Guava Splitter provides some other useful methods such as fixedLength, omitEmptyStrings, trimResults, limit.


As described in code above, Guava provides a Joiner that can join text with a separator. Joiner also provides useful methods such as skipNulls, useForNull(nullText).
Resources
Strings Explained
Splitter Javadoc
Joiner Javadoc
Guava Splitter vs StringUtils
Post a Comment

Labels

Java (159) Lucene-Solr (110) All (60) Interview (59) J2SE (53) Algorithm (37) Eclipse (35) Soft Skills (35) Code Example (31) Linux (26) JavaScript (23) Spring (22) Windows (22) Web Development (20) Tools (19) Nutch2 (18) Bugs (17) Debug (15) Defects (14) Text Mining (14) J2EE (13) Network (13) PowerShell (11) Chrome (9) Continuous Integration (9) How to (9) Learning code (9) Performance (9) UIMA (9) html (9) Design (8) Dynamic Languages (8) Http Client (8) Maven (8) Security (8) Trouble Shooting (8) bat (8) blogger (8) Big Data (7) Google (7) Guava (7) JSON (7) Problem Solving (7) ANT (6) Coding Skills (6) Database (6) Scala (6) Shell (6) css (6) Algorithm Series (5) Cache (5) IDE (5) Lesson Learned (5) Miscs (5) Programmer Skills (5) System Design (5) Tips (5) adsense (5) xml (5) AIX (4) Code Quality (4) GAE (4) Git (4) Good Programming Practices (4) Jackson (4) Memory Usage (4) OpenNLP (4) Project Managment (4) Python (4) Spark (4) Testing (4) ads (4) regular-expression (4) Android (3) Apache Spark (3) Become a Better You (3) Concurrency (3) Eclipse RCP (3) English (3) Firefox (3) Happy Hacking (3) IBM (3) J2SE Knowledge Series (3) JAX-RS (3) Jetty (3) Restful Web Service (3) Script (3) regex (3) seo (3) .Net (2) Android Studio (2) Apache (2) Apache Procrun (2) Architecture (2) Batch (2) Build (2) Building Scalable Web Sites (2) C# (2) C/C++ (2) CSV (2) Career (2) Cassandra (2) Distributed (2) Fiddler (2) Google Drive (2) Gson (2) Html Parser (2) Http (2) Image Tools (2) JQuery (2) Jersey (2) LDAP (2) Life (2) Logging (2) Software Issues (2) Storage (2) Text Search (2) xml parser (2) AOP (1) Application Design (1) AspectJ (1) Bit Operation (1) Chrome DevTools (1) Cloud (1) Codility (1) Data Mining (1) Data Structure (1) ExceptionUtils (1) Exif (1) Feature Request (1) FindBugs (1) Greasemonkey (1) HTML5 (1) Httpd (1) I18N (1) IBM Java Thread Dump Analyzer (1) JDK Source Code (1) JDK8 (1) JMX (1) Lazy Developer (1) Mac (1) Machine Learning (1) Mobile (1) My Plan for 2010 (1) Netbeans (1) Notes (1) Operating System (1) Perl (1) Problems (1) Product Architecture (1) Programming Life (1) Quality (1) Redhat (1) Redis (1) Review (1) RxJava (1) Solutions logs (1) Team Management (1) Thread Dump Analyzer (1) Troubleshooting (1) Visualization (1) boilerpipe (1) htm (1) ongoing (1) procrun (1) rss (1)

Popular Posts