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// --- BEGIN COPYRIGHT BLOCK ---
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; version 2 of the License.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// (C) 2007 Red Hat, Inc.
// All rights reserved.
// --- END COPYRIGHT BLOCK ---
package com.netscape.certsrv.pattern;
import java.util.*;
import com.netscape.certsrv.base.*;
/**
* This is a generic pattern subtitution engine. The
* pattern format should be:
* <p>
* $[attribute set key].[attribute name]$
* <p>
* For example,
* <p>
* $request.requestor_email$
* $ctx.user_id$
* <p>
*
* @version $Revision$, $Date$
*/
public class Pattern {
private String mS = null;
/**
* Constructs a pattern object with the given string.
*
* @param s string with pattern (i.e. $request.requestor_email$)
*/
public Pattern(String s) {
mS = s;
}
/**
* Subtitutes this pattern with the given attribute set.
*
* @param key key name of the given attribute set
* @param attrSet attribute set
* @return substituted string
*/
public String substitute(String key, IAttrSet attrSet) {
return substitute2(key, attrSet);
}
/**
* Subtitutes this pattern with the given attribute set.
*
* @param attrSetCollection attribute set collection
* @return substituted string
*/
public String substitute(AttrSetCollection attrSetCollection) {
String temp = mS;
Enumeration keys = attrSetCollection.keys();
while (keys.hasMoreElements()) {
String key = (String) keys.nextElement();
Pattern p = new Pattern(temp);
temp = p.substitute(key,
attrSetCollection.getAttrSet(key));
}
return temp;
}
/**
* Subtitutes this pattern with the given attribute set.
*
* This is an extended version of the substitute() method.
* It takes a more flexible pattern format that could have
* non-token ($...$) format. e.g.
* $request.screenname$@redhat.com
* where "@redhat.com" is not in token pattern format, and will be
* literally put in place. e.g.
* TomRiddle@redhat.com
*
* @param key key name of the given attribute set
* @param attrSet attribute set
* @return substituted string
*/
public String substitute2(String key, IAttrSet attrSet) {
StringBuffer sb = new StringBuffer();
int startPos = 0;
int lastPos;
do {
// from startPos to right before '$' or end of string
// need to be copied over
lastPos = mS.indexOf('$', startPos);
// if no '$', return the entire string
if (lastPos == -1 && startPos == 0)
return mS;
// no more '$' found, copy the rest of chars, done
if (lastPos == -1) {
sb.append(mS.substring(startPos)); //
return sb.toString(); //
// continue;
}
// found '$'
if (startPos < lastPos) {
sb.append(mS.substring(startPos, lastPos));
}
// look for the ending '$'
int endPos = mS.indexOf('$', lastPos + 1);
String token = mS.substring(lastPos + 1, endPos);
int dotPos = token.indexOf('.');
// it's assuming there's always a '.'
String attrKey = token.substring(0, dotPos);
String attrName = token.substring(dotPos + 1);
if (!key.equals(attrKey)) {
startPos = endPos + 1;
sb.append("$" + attrKey + "." + attrName + "$");
continue;
}
try {
Object o = attrSet.get(attrName);
if (!(o instanceof String)) {
startPos = endPos + 1;
// if no such attrName, copy the token pattern over
sb.append("$" + attrKey + "." + attrName + "$");
continue;
}
String val = (String) o;
sb.append(val);
} catch (EBaseException e) {
sb.append("$" + attrKey + "." + attrName + "$");
}
startPos = endPos + 1;
}
while (lastPos != -1);
return sb.toString();
}
}
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