Substitute sub-strings in side of a string
import java.util.Map;
/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
public class Main{
/** An empty string constant */
public static final String EMPTY = "";
/////////////////////////////////////////////////////////////////////////
// Substitution Methods //
/////////////////////////////////////////////////////////////////////////
/**
* Substitute sub-strings in side of a string.
*
* @param buff Stirng buffer to use for substitution (buffer is not reset)
* @param from String to substitute from
* @param to String to substitute to
* @param string String to look for from in
* @return Substituted string
*/
public static String subst(final StringBuffer buff, final String from,
final String to, final String string)
{
int begin = 0, end = 0;
while ((end = string.indexOf(from, end)) != -1)
{
// append the first part of the string
buff.append(string.substring(begin, end));
// append the replaced string
buff.append(to);
// update positions
begin = end + from.length();
end = begin;
}
// append the rest of the string
buff.append(string.substring(begin, string.length()));
return buff.toString();
}
/**
* Substitute sub-strings in side of a string.
*
* @param from String to substitute from
* @param to String to substitute to
* @param string String to look for from in
* @return Substituted string
*/
public static String subst(final String from, final String to,
final String string)
{
return subst(new StringBuffer(), from, to, string);
}
/**
* Substitute sub-strings in side of a string.
*
* @param buff String buffer to use for substitution (buffer is not reset)
* @param string String to subst mappings in
* @param map Map of from->to strings
* @param beginToken Beginning token
* @param endToken Ending token
* @return Substituted string
*/
public static String subst(final StringBuffer buff, final String string,
final Map map, final String beginToken,
final String endToken)
{
int begin = 0, rangeEnd = 0;
Range range;
while ((range = rangeOf(beginToken, endToken, string, rangeEnd)) != null)
{
// append the first part of the string
buff.append(string.substring(begin, range.begin));
// Get the string to replace from the map
String key = string.substring(range.begin + beginToken.length(),
range.end);
Object value = map.get(key);
// if mapping does not exist then use empty;
if (value == null) value = EMPTY;
// append the replaced string
buff.append(value);
// update positions
begin = range.end + endToken.length();
rangeEnd = begin;
}
// append the rest of the string
buff.append(string.substring(begin, string.length()));
return buff.toString();
}
/**
* Substitute sub-strings in side of a string.
*
* @param string String to subst mappings in
* @param map Map of from->to strings
* @param beginToken Beginning token
* @param endToken Ending token
* @return Substituted string
*/
public static String subst(final String string, final Map map,
final String beginToken, final String endToken)
{
return subst(new StringBuffer(), string, map, beginToken, endToken);
}
/**
* Substitute index identifiers with the replacement value from the
* given array for the corresponding index.
*
* @param buff The string buffer used for the substitution
* (buffer is not reset).
* @param string String substitution format.
* @param replace Array of strings whose values will be used as
* replacements in the given string when a token with
* their index is found.
* @param token The character token to specify the start of an index
* reference.
* @return Substituted string.
*/
public static String subst(final StringBuffer buff, final String string,
final String replace[], final char token)
{
int i = string.length();
for (int j = 0; j >= 0 && j < i; j++)
{
char c = string.charAt(j);
// if the char is the token, then get the index
if (c == token)
{
// if we aren't at the end of the string, get the index
if (j != i)
{
int k = Character.digit(string.charAt(j + 1), 10);
if (k == -1)
{
buff.append(string.charAt(j + 1));
}
else if (k < replace.length)
{
buff.append(replace[k]);
}
j++;
}
}
else
{
buff.append(c);
}
}
return buff.toString();
}
/**
* Substitute index identifiers with the replacement value from the
* given array for the corresponding index.
*
* @param string String substitution format.
* @param replace Array of strings whose values will be used as
* replacements in the given string when a token with
* their index is found.
* @param token The character token to specify the start of an index
* reference.
* @return Substituted string.
*/
public static String subst(final String string, final String replace[],
final char token)
{
return subst(new StringBuffer(), string, replace, token);
}
/**
* Substitute index identifiers (with <code>%</code> for the index token)
* with the replacement value from the given array for the corresponding
* index.
*
* @param string String substitution format.
* @param replace Array of strings whose values will be used as
* replacements in the given string when a token with
* their index is found.
* @return Substituted string.
*/
public static String subst(final String string, final String replace[])
{
return subst(new StringBuffer(), string, replace, '%');
}
/////////////////////////////////////////////////////////////////////////
// Range Methods //
/////////////////////////////////////////////////////////////////////////
/**
* Represents a range between two integers.
*/
public static class Range
{
/** The beginning of the range. */
public int begin;
/** The end of the range. */
public int end;
/**
* Construct a new range.
*
* @param begin The beginning of the range.
* @param end The end of the range.
*/
public Range(int begin, int end)
{
this.begin = begin;
this.end = end;
}
/**
* Default constructor.
*/
public Range()
{
}
}
/**
* Return the range from a begining token to an ending token.
*
* @param beginToken String to indicate begining of range.
* @param endToken String to indicate ending of range.
* @param string String to look for range in.
* @param fromIndex Beginning index.
* @return (begin index, end index) or <i>null</i>.
*/
public static Range rangeOf(final String beginToken, final String endToken,
final String string, final int fromIndex)
{
int begin = string.indexOf(beginToken, fromIndex);
if (begin != -1)
{
int end = string.indexOf(endToken, begin + 1);
if (end != -1)
{
return new Range(begin, end);
}
}
return null;
}
/**
* Return the range from a begining token to an ending token.
*
* @param beginToken String to indicate begining of range.
* @param endToken String to indicate ending of range.
* @param string String to look for range in.
* @return (begin index, end index) or <i>null</i>.
*/
public static Range rangeOf(final String beginToken, final String endToken,
final String string)
{
return rangeOf(beginToken, endToken, string, 0);
}
}
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