AsyncEntity.java

/**
 * 
 */
package org.commcare.android.models;

import org.commcare.suite.model.DetailField;
import org.commcare.suite.model.Text;
import org.javarosa.core.model.condition.EvaluationContext;
import org.javarosa.xpath.XPathException;



/**
 * @author ctsims
 *
 */
public class AsyncEntity<T> extends Entity<T>{
    
    DetailField[] fields;
    Object[] data;
    String[] sortData;
    EvaluationContext context;
    
    public AsyncEntity(DetailField[] fields, EvaluationContext ec, T t) {
        super(t);
        this.fields = fields;
        this.data = new Object[fields.length];
        this.sortData = new String[fields.length];
        this.context = ec;
    }
    
    public Object getField(int i) {
        if(data[i] == null) {
            try {
                data[i] = fields[i].getTemplate().evaluate(context);
            } catch(XPathException xpe) {
                xpe.printStackTrace();
                data[i] = "<invalid xpath: " + xpe.getMessage() + ">";
            }
        }
        return data[i];
    }
    
    public String getSortField(int i) {
        if(sortData[i] == null) {
            try {
                Text sortText = fields[i].getSort();
                if(sortText == null) {
                    sortData[i] = getFieldString(i);
                } else {
                    sortData[i] = sortText.evaluate(context);
                }
            } catch(XPathException xpe) {
                xpe.printStackTrace();
                sortData[i] = "<invalid xpath: " + xpe.getMessage() + ">";
            }
        }
        return sortData[i];
    }

    public int getNumFields() {
        return fields.length;
    }
}