1 files changed, 173 insertions, 0 deletions
diff --git a/roombacomm-client/src/com/hackingroomba/roombacomm/XML.java b/roombacomm-client/src/com/hackingroomba/roombacomm/XML.java
new file mode 100644
index 0000000..e64ce0f
--- /dev/null
+++ b/roombacomm-client/src/com/hackingroomba/roombacomm/XML.java
@@ -0,0 +1,173 @@
+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.
+    &amp; -> &
+    &quote; -> "
+    &lt; -> <
+    &gt; -> >
+  */
+  private String unescape(String txt)
+  {
+    replace(txt, "&amp;", "&");
+    replace(txt, "&quote;", "\"");
+    replace(txt, "&lt;", "<");
+    replace(txt, "&gt;", ">");
+    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"));
+  }
+*/
+}