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1. build a handler for the thread you want to work with the data
2. count the times the sax parsers reads the desired start tag and fill an array with the data you read
3. in the startelement method when desired tag is read check if the count fits your needs.
    If so send a message to the handler from 1 with the data array you collected. After that reset counter
    and clear the array.


Ant1 wrote:Hello again PlusMinus first let me say thanks for all the help with my two questions and the advice given has helped but now I'm stuck again

I've used the ArrayList to store the 22 tags I need and I try to access them in the characters method but when I run the emulator all I get is a message saying null and I don't even get the double values here is my code again

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1.  
2. import java.util.ArrayList;
3.  
4. import org.xml.sax.Attributes;
5. import org.xml.sax.SAXException;
6. import org.xml.sax.helpers.DefaultHandler;
7.  
8. public class ExampleHandler extends DefaultHandler {
9.        
10.        
11.         //test tags see if we have to parse the whole document
12.         //or only the part we want ???
13.        
14.         private boolean in_curr_tag = false;
15.         private boolean in_obs_tag = false;
16.        
17.         //ArrayList to hold all the time we hit the closing tags </in_curr_tag>
18.         private ArrayList<ParsedExampleDataSet> list = new ArrayList<ParsedExampleDataSet>(22);
19.        
20.         private ParsedExampleDataSet peds = new ParsedExampleDataSet();
21.        
22.         public ParsedExampleDataSet getParsedData(){
23.                 return this.peds;
24.         }
25.        
26.         @Override
27.         public void startDocument() throws SAXException {
28.                 this.peds = new ParsedExampleDataSet();
29.         }
30.        
31.         @Override
32.         public void endDocument() throws SAXException {
33.                 //nothing to do here
34.         }
35.        
36.         /*
37.          * Gets be called on opening tags like
38.          * <tag>
39.          * Can provide attribute(s), when xml was like:
40.          * <tag attribute="attributeValue">*/
41.          @Override
42.          public void startElement(String namespaceURI, String localName,
43.                                                                 String qName, Attributes atts)throws SAXException{
44.                  
45.                  if(localName.equals("frbny:CURR")){
46.                          this.in_curr_tag = true;
47.                  }else if(localName.equals("frbny:OBS_VALUE")){
48.                          this.in_obs_tag = true;
49.                  }
50.          }
51.          
52.          //Called on closing tags like </tag>
53.          @Override
54.          public void endElement(String namespaceURI, String localName, String qName) throws SAXException{
55.                  
56.                  
57.                  if(localName.equals("frbny:CURR")){
58.                         //add all 22 tags to the ArrayList
59.                          for(int i = 1; i < list.size(); i++){
60.                                  list.add(i, peds);
61.                          }
62.                          //testing purposes only
63.                          //peds.setExtractedInt(list.size());
64.                          this.in_curr_tag = false;
65.                  }else if(localName.equals("frbny:OBS_VALUE")){
66.                          this.in_obs_tag = false;
67.                  }
68.                  
69.                
70.          }
71.          
72.          /** Gets be called on the following structure:
73.       * <tag>characters</tag> */
74.      @Override
75.     public void characters(char ch[], int start, int length) {
76.          
77.          if(this.in_curr_tag){ 
78.                  peds = list.get(0);
79.                  peds.setExtractedString(new String(ch, start, length));
80.          }
81.          if(this.in_obs_tag){
82.                  peds.setExtractedDouble(Double.parseDouble(new String(ch, start, length)));
83.          }
84.          
85.          
86.     }
87. }
88.  
89.  

Parsed in 0.039 seconds, using GeSHi 1.0.8.4

I'm not sure if I need another for loop to access the ParsedExampleDataSets or not but I don't think so. My question is why am I not able to access the individual tags of the file, I have overloaded the setExtractedString method in the ParsedExampleDataSet class to accept an int along with the String so I can run through the list but again I am not sure if this is necessary. I have gone through google's webpage for the ArrayList class I don't think I missed anything but many eyes are better then one Thanks for any help in advance again

Anthony

padde wrote:Well.. no.. just pass the handler object over to the class that extends the DefaultHandler.

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1. class MyHandler extends DefaultHandler {
2.     private Handler mhandler;
3.     ...
4.  
5.     public MyHandler(Handler h) {
6.         super();
7.         this.mhandler = h;
8.     }
9.  
10.     public void startDocument() throws SAXException { ... }
11.     public void endDocument() throws SAXException { ... }
12.     public void startElement(String n, String l, String q, Attributes a) { ... }
13.     public void endDocument(String n, String l, String q, Attributes a) { ... }
14.     public void characters(char[] c, int s, int l) { ... }
15. }
16.  

Parsed in 0.034 seconds, using GeSHi 1.0.8.4

like that.. and then use mHandler to send messages to.