Link.java :  » Web » memento-browser » dev » memento » Android Open Source

package dev.memento;

import android.util.Log;

public class Link {
  
  private final String LOG_TAG = MementoBrowser.LOG_TAG;
  
  private String mUrl;
  private String mRel;
  private String mType;
  private SimpleDateTime mDatetime;
  
    
  /*
   *  Parse the text provided which comes from the http response
   *  Examples:
   *  
   *  <http://mementoproxy.lanl.gov/aggr/timebundle/http://www.harding.edu/fmccown/>;rel="timebundle",
   *  <http://www.harding.edu/fmccown/>;rel="original",<http://mementoproxy.lanl.gov/aggr/timemap/link/http://www.harding.edu/fmccown/>;rel="timemap";type="text/csv",
   *  <http://web.archive.org/web/20010724154504/www.harding.edu/fmccown/>;rel="first-memento prev-memento";datetime="Tue, 24 Jul 2001 15:45:04 GMT",
   *  <http://web.archive.org/web/20010910203350/www.harding.edu/fmccown/>;rel="memento";datetime="Mon, 10 Sep 2001 20:33:50 GMT",
   *  <http://webcache.googleusercontent.com/search?q=cache:http://www.digitalpreservation.gov/>;rel="first-memento last-memento memento";datetime="Tue, 07 Sep 2010 11:54:29 GMT"
   *  
   */  
  public Link(String link) {
        
    // Grab URL
    int index = link.indexOf(">;");
    if (index == -1) {
      Log.e(LOG_TAG, "Unable to find >; in [" + link + "]");
      return;
    }
    else
      mUrl = link.substring(1, index);
          
    // Remove URL part so we can grab the remaining parts
    link = link.substring(index + 2);
    
    String[] parts = link.split("\\s*;\\s*");
    if (parts.length == 0) {
      Log.e(LOG_TAG, "Unexpected format: [" + link + "]");
      return;
    }
        
    for (String part : parts) {
      part = part.trim();
      
      if (part.startsWith("rel="))
        parseRel(part);
      else if (part.startsWith("datetime="))
        parseDatetime(part);
      else if (part.startsWith("type="))
        parseType(part);
      else {
        Log.e(LOG_TAG, "Unexpected value: [" + part + "] when looking for rel, datetime, or type");
        return;
      }
    }
    
    // Make sure all parts were present
    
    if (mRel == null) {
      Log.e(LOG_TAG, "Missing rel for memento in: [" + link + "]");    
    }
    else if (mRel.contains("memento")) {                  
      if (mDatetime == null)
        Log.e(LOG_TAG, "Missing datetime for memento in: [" + link + "]");    
    }
    else if (mRel.equals("timemap")) {
      if (mType == null)
        Log.e(LOG_TAG, "Missing type for timemap in: [" + link + "]");    
    }
  }
  
  private void parseRel(String rel) {
        
    // Get rid of rel= at the beginning and quotes
    rel = rel.replace("rel=\"", "");
    rel = rel.replaceAll("\",?$", "");
    
    if (rel.contains("timebundle")) 
      mRel = "timebundle";
    else if (rel.contains("timemap")) 
      mRel = "timemap";
    else if (rel.contains("timegate")) 
      mRel = "timegate";
    else if (rel.contains("original"))
      mRel = "original";
    else if (rel.contains("memento")) {    
      // Could contain "first memento", "last memento", "prev memento", "next memento", 
      // or "memento" or any combination of these like "first last memento"
      mRel = rel;
    }
    else {
      Log.e(LOG_TAG, "Undefined rel: [" + rel + "]");
      return;
    }    
  }
  
  private void parseDatetime(String datetime) {
    
    // Remove initial part and quotes
    datetime = datetime.replaceAll("datetime=\"", "");
    datetime = datetime.replaceAll("\",?$", "");
    
    mDatetime = new SimpleDateTime(datetime);    
  }
  
  private void parseType(String type) {
    
    // Remove initial part and quotes (and possible comma at end)
    type = type.replaceAll("type=\"", "");
    type = type.replaceAll("\",?$", "");
    
    mType = type;
  }

  public String getUrl() {
    return mUrl;
  }

  public void setUrl(String url) {
    this.mUrl = url;
  }

  public String getRel() {
    return mRel;
  }
  
  public String[] getRelArray() {
    if (mRel == null)
      return null;
    else
      return mRel.split("\\s+");
  }

  public void setRel(String rel) {
    this.mRel = rel;
  }

  public String getType() {
    return mType;
  }

  public void setType(String type) {
    this.mType = type;
  }

  public SimpleDateTime getDatetime() {
    return mDatetime;
  }

  public void setDatetime(SimpleDateTime datetime) {
    this.mDatetime = datetime;
  }
}