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package com.hackingroomba.roombacomm;
import java.util.Hashtable;
import java.util.Vector;
/* The following XML class is a simple XML class meant to process the primitive XML
* that comes from RoboRealm. This class can be removed and replaced with a more
* extensive XML processing class as needed but is guaranteed to work with the RR
* XML. Do NOT use this class for generic XML processing as it is included for
* completeness and is intentionally kept simplistic to ease understanding
* */
class XML
{
Hashtable <String, String>table = new Hashtable<String, String>();
Vector <String>list = new Vector<String>();
private String replace(String txt, String src, String dest)
{
if (txt==null) return new String("");
int i,j;
int len=src.length();
StringBuffer sb=new StringBuffer(txt.length());
j=0;
while ((i=txt.indexOf(src,j))>=0)
{
sb.append(txt.substring(j,i));
sb.append(dest);
i+=len;
j=i;
}
sb.append(txt.substring(j));
return sb.toString();
}
/*
Unescapes strings that have been included in an XML message. This can be
accomplished by a sequence of replace statements.
& -> &
"e; -> "
< -> <
> -> >
*/
private String unescape(String txt)
{
replace(txt, "&", "&");
replace(txt, ""e;", "\"");
replace(txt, "<", "<");
replace(txt, ">", ">");
return txt;
}
public boolean parse(String s)
{
table.clear();
return parse(s, table, null);
}
public Vector parseVector(String s)
{
list.removeAllElements();
if (parse(s, null, list))
return list;
else
return null;
}
public boolean parse(String s, Hashtable <String, String>h, Vector <String>v)
{
boolean isEndTag;
byte txt[] = s.getBytes();
int i, j;
int len = s.length();
StringBuffer keys[] = new StringBuffer[10];
StringBuffer value = new StringBuffer();
for (i=0;i<10;i++)
keys[i] = new StringBuffer();
int keyTop=-1;
for (i=0;i<len;)
{
// read in key
if (txt[i]=='<')
{
i++;
if (txt[i]=='/')
{
isEndTag = true;
i++;
}
else
isEndTag = false;
keyTop++;
keys[keyTop].setLength(0);
while ((i<len)&&(txt[i]!='>'))
{
keys[keyTop].append((char)txt[i]);
i++;
}
if (txt[i++]!='>')
{
System.out.println("Missing close > tag");
return false;
}
if (isEndTag)
{
if (!keys[keyTop].toString().equals(keys[keyTop-1].toString()))
{
System.out.println("Mismatched XML tags "+keys[keyTop]+" -> "+keys[keyTop-1]);
return false;
}
keyTop-=2;
}
}
else
{
// read in value
value.setLength(0);
while ((i<len)&&(txt[i]!='<'))
{
value.append((char)txt[i]);
i++;
}
StringBuffer key = new StringBuffer();
for (j=0;j<=keyTop;j++)
{
if (j>0) key.append('.');
key.append(keys[j]);
}
String escapedValue = unescape(value.toString());
if (h!=null) h.put(key.toString(), escapedValue);
if (v!=null) v.addElement(escapedValue);
}
}
return true;
}
public int getInt(String txt)
{
String s = (String)table.get(txt);
if (s!=null)
{
return Integer.parseInt(s);
}
return 0;
}
public String getFirst()
{
if (table.isEmpty())
return null;
else
return (String)table.elements().nextElement();
}
/*
// This is where the program first starts
public static void main(String[] args)
{
XML xml = new XML();
xml.parse("<response><width>100</width><height>200</height></response>");
System.out.println(xml.getInt("response.width"));
System.out.println(xml.getInt("response.height"));
}
*/
}
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