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package com.sun.enterprise.diagnostics.report.html;
import com.sun.enterprise.diagnostics.Data;
import java.util.ArrayList;
import java.util.Map;
import java.util.HashMap;
import java.util.Iterator;
/**
*
* @author mu125243
*/
public class DataTraverser {
private Data dataObj;
/**
* Key of the map is one of the DataTypes. Assumption is there is one
* to one relationship between key and its value.
*/
private Map typeToData;
/** Creates a new instance of DataTraverser */
public DataTraverser(Data dataObj) {
this.dataObj = dataObj;
}
/**
* Returns the data object which this traverser is visiting
* @return Data
*/
public Data getSource() {
return dataObj;
}
/**
* Return child data object of type supplied as a parameter
* @param type data object type
* @return data object
*/
public Iterator<Data> getData(String type) {
if(typeToData == null)
traverse();
Object obj = typeToData.get(type);
if(obj != null) {
ArrayList list = (ArrayList)obj;
return list.iterator();
}
return new ArrayList().iterator();
}
private void traverse() {
if(typeToData == null)
typeToData = new HashMap(5);
Iterator<Data> children = dataObj.getChildren();
while(children.hasNext()) {
Data child = children.next();
ArrayList list = (ArrayList)typeToData.get(child.getType());
if (list == null) {
list = new ArrayList(5);
typeToData.put(child.getType(), list);
}
list.add(child);
}
}
}