Project 2 - Enhanced Data Class

The class just posted required an enhanced data class to model the VuFind records. Here it is!

/**
 *
 */
package crrasolrindexer;

import java.io.*;
import java.util.Iterator;
import java.util.LinkedHashSet;

/**
 * @author slittle2
 *
 *    The CRRA_Datum class is just like the IndeDatum class, but modified to work
 *    with the CRRA schema (or any other). It holds the kinds of data that are to be extracted
 *    from an indexed field, whether MARC or EAD (or anything else). All fields
 *    are private; only a protected method allows setting them, and a public
 *    method allows retrieving their contents. (The setField() method is
 *    protected so that one has to change the data through the appropriate
 *    class that indexes the data.
 *
 *    This class is designed to be easily extensible for use with other kinds
 *    of data. UNLIKE IndexDatum, it may be passed as string of schema names from
 *    which it builds a new schema for its entries.
 *
 *    Note that the schema names used here are independent of the schema *map* that
 *    the CRRA_EADRetriever class uses to map from EAD to VuFind. If inconsistences
 *    occur between the schema here and the schema_map (or between these and the actual
 *    VuFind schema), unpredictable behavior may result.
 *
 */
public class CRRA_Datum {

    private class Entry {
        String name;
        String content;
      
        Entry() {
            name = "";
            content = "";
        }
      
        Entry(String n, String c){
            name = n;
            content = c;
        }
      
    }
   
    // The default schema is that used in Vufind as of this coding (June 2010).
    private String schema_names = "id fullrecord allfields institution collection building language format author author-letter authorStr auth_author auth_authorStr title title_sort title_sub title_short title_full title_fullStr title_auth physical publisher publisherStr publishDate edition description contents url thumbnail lccn ctrlnum isbn issn callnumber callnumber-a callnumber-first callnumber-first-code callnumber-subject callnumber-subject-code callnumber-label dewey-hundreds dewey-tens dewey-ones dewey-full dewey-sort author2 author2Str author2-role auth_author2 auth_author2Str author_additional author_additionalStr title_alt title_old title_new dateSpan series series2 topic genre geographic illustrated recordtype";
    private LinkedHashSet<Entry> entries = null;
   
    // Pass a string containing scheme file names separated by a ' '.
    public CRRA_Datum(String schema_names) {
      
        entries = new LinkedHashSet<Entry>();
      
        String[] schema = schema_names.split(" ");
      
        for(int i = 0; i < schema.length; i++){
            entries.add(new Entry(schema[i], ""));
        }
      
    }
   
    // Default contructor uses current (2010) Vufind schema names
    public CRRA_Datum() {
      
        entries = new LinkedHashSet<Entry>();
      
        String[] schema = schema_names.split(" ");
      
        for(int i = 0; i < schema.length; i++){
            entries.add(new Entry(schema[i], ""));
        }
      
    }
   
    // Return the names of the schema fields as a single string. This can then be parsed/tokenized as needed.
    public String returnSchemaNames(){
        return schema_names;
    }
   
    // Return a given field's value.
    public String returnField(String fieldName) throws IOException {
   
        Iterator<Entry> iter = entries.iterator();
      
        while(iter.hasNext()){
            Entry entry = (Entry) iter.next();
            if(entry.name.equalsIgnoreCase(fieldName)){
                return entry.content;
            }
        }
        throw new IOException();
      
    }
   
    // Set the value of a given field. Completely overwrites the original.
    protected void setField(String fieldName, String data) throws IOException {
      
        Iterator<Entry> iter = entries.iterator();
      
        while(iter.hasNext()){
            Entry entry = (Entry) iter.next();
            if(entry.name.equalsIgnoreCase(fieldName)){
                entry.content = data;
                return;
            }
        }
        throw new IOException();
      
    }
   
    // Adds data to a field without overwriting it.
    protected void concatenateField(String fieldName, String data) throws IOException {

        Iterator<Entry> iter = entries.iterator();
      
        while(iter.hasNext()){
            Entry entry = (Entry) iter.next();
            if(entry.name.equalsIgnoreCase(fieldName)){
                entry.content += data;
                return;
            }
        }
        throw new IOException();
      
    }
   
    // Displays the fields/values of the entire Datum.
    public String toString(){
        String contents = "";

        Iterator<Entry> iter = entries.iterator();
      
        while(iter.hasNext()){
            Entry entry = (Entry) iter.next();

            contents += "\n " + entry.name + "\t\t"+ entry.content;
          
        }
      
        return contents;
    }
   
}