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package org.postgresql.util;
import java.sql.*;
import java.util.*;
/*
* This class is used to tokenize the text output of org.postgres.
*
* <p>It's mainly used by the geometric classes, but is useful in parsing any
* output from custom data types output from org.postgresql.
*
* @see org.postgresql.geometric.PGbox
* @see org.postgresql.geometric.PGcircle
* @see org.postgresql.geometric.PGlseg
* @see org.postgresql.geometric.PGpath
* @see org.postgresql.geometric.PGpoint
* @see org.postgresql.geometric.PGpolygon
*/
public class PGtokenizer
{
// Our tokens
protected Vector tokens;
/*
* Create a tokeniser.
*
* <p>We could have used StringTokenizer to do this, however, we needed to
* handle nesting of '(' ')' '[' ']' '<' and '>' as these are used
* by the geometric data types.
*
* @param string containing tokens
* @param delim single character to split the tokens
*/
public PGtokenizer(String string, char delim)
{
tokenize(string, delim);
}
/*
* This resets this tokenizer with a new string and/or delimiter.
*
* @param string containing tokens
* @param delim single character to split the tokens
*/
public int tokenize(String string, char delim)
{
tokens = new Vector();
// nest holds how many levels we are in the current token.
// if this is > 0 then we don't split a token when delim is matched.
//
// The Geometric datatypes use this, because often a type may have others
// (usualls PGpoint) imbedded within a token.
//
// Peter 1998 Jan 6 - Added < and > to the nesting rules
int nest = 0, p, s;
for (p = 0, s = 0;p < string.length();p++)
{
char c = string.charAt(p);
// increase nesting if an open character is found
if (c == '(' || c == '[' || c == '<')
nest++;
// decrease nesting if a close character is found
if (c == ')' || c == ']' || c == '>')
nest--;
if (nest == 0 && c == delim)
{
tokens.addElement(string.substring(s, p));
s = p + 1; // +1 to skip the delimiter
}
}
// Don't forget the last token ;-)
if (s < string.length())
tokens.addElement(string.substring(s));
return tokens.size();
}
/*
* @return the number of tokens available
*/
public int getSize()
{
return tokens.size();
}
/*
* @param n Token number ( 0 ... getSize()-1 )
* @return The token value
*/
public String getToken(int n)
{
return (String)tokens.elementAt(n);
}
/*
* This returns a new tokenizer based on one of our tokens.
*
* The geometric datatypes use this to process nested tokens (usually
* PGpoint).
*
* @param n Token number ( 0 ... getSize()-1 )
* @param delim The delimiter to use
* @return A new instance of PGtokenizer based on the token
*/
public PGtokenizer tokenizeToken(int n, char delim)
{
return new PGtokenizer(getToken(n), delim);
}
/*
* This removes the lead/trailing strings from a string
* @param s Source string
* @param l Leading string to remove
* @param t Trailing string to remove
* @return String without the lead/trailing strings
*/
public static String remove(String s, String l, String t)
{
if (s.startsWith(l))
s = s.substring(l.length());
if (s.endsWith(t))
s = s.substring(0, s.length() - t.length());
return s;
}
/*
* This removes the lead/trailing strings from all tokens
* @param l Leading string to remove
* @param t Trailing string to remove
*/
public void remove(String l, String t)
{
for (int i = 0;i < tokens.size();i++)
{
tokens.setElementAt(remove((String)tokens.elementAt(i), l, t), i);
}
}
/*
* Removes ( and ) from the beginning and end of a string
* @param s String to remove from
* @return String without the ( or )
*/
public static String removePara(String s)
{
return remove(s, "(", ")");
}
/*
* Removes ( and ) from the beginning and end of all tokens
* @return String without the ( or )
*/
public void removePara()
{
remove("(", ")");
}
/*
* Removes [ and ] from the beginning and end of a string
* @param s String to remove from
* @return String without the [ or ]
*/
public static String removeBox(String s)
{
return remove(s, "[", "]");
}
/*
* Removes [ and ] from the beginning and end of all tokens
* @return String without the [ or ]
*/
public void removeBox()
{
remove("[", "]");
}
/*
* Removes < and > from the beginning and end of a string
* @param s String to remove from
* @return String without the < or >
*/
public static String removeAngle(String s)
{
return remove(s, "<", ">");
}
/*
* Removes < and > from the beginning and end of all tokens
* @return String without the < or >
*/
public void removeAngle()
{
remove("<", ">");
}
}
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