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/* gnu.classpath.tools.doclets.PackageMatcher
Copyright (C) 2004 Free Software Foundation, Inc.
This file is part of GNU Classpath.
GNU Classpath 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; either version 2, or (at your option)
any later version.
GNU Classpath 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 GNU Classpath; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
package gnu.classpath.tools.doclets;
import java.util.Iterator;
import java.util.HashSet;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.sun.javadoc.PackageDoc;
/**
* Filters a set of packages according to a set of wildcards.
*/
public class PackageMatcher
{
private Set patterns = new HashSet();
/**
* Add a wildcard to be matched. Wildcards can contain asterisk
* characters which match zero or more characters.
*
* @throw InvalidPackageWildcardException if the wildcard cannot
* match any valid package name.
*/
public void addWildcard(String wildcard)
throws InvalidPackageWildcardException
{
final int STATE_ID_START = 0;
final int STATE_ID = 1;
int state = STATE_ID_START;
char[] wildcardChars = wildcard.toCharArray();
StringBuffer regexString = new StringBuffer();
for (int i=0; i<wildcardChars.length; ++i) {
char c = wildcardChars[i];
switch (state) {
case STATE_ID_START:
if ('*' == c) {
regexString.append(".*");
}
else if (Character.isJavaIdentifierStart(c)) {
regexString.append(c);
}
else {
throw new InvalidPackageWildcardException(wildcard);
}
state = STATE_ID;
break;
case STATE_ID:
if ('.' == c) {
regexString.append("\\.");
state = STATE_ID_START;
}
else if ('*' == c) {
regexString.append(".*");
}
else if (Character.isJavaIdentifierPart(c)) {
regexString.append(c);
}
else {
throw new InvalidPackageWildcardException(wildcard);
}
}
}
if (STATE_ID_START == state) {
throw new InvalidPackageWildcardException(wildcard);
}
patterns.add(Pattern.compile(regexString.toString()));
}
/**
* Return a sorted, filtered set of packages. A package from the
* array given will be put into the output list if it matches one
* or more of the wildcards added to this PackageMatcher before.
*/
public SortedSet filter(PackageDoc[] packageDocs)
{
SortedSet result = new TreeSet();
for (int i=0; i<packageDocs.length; ++i) {
if (match(packageDocs[i])) {
result.add(packageDocs[i]);
}
}
return result;
}
/**
* Return true when the given PackageDoc matches one or more of
* the wildcard added to this PackageMatcher before.
*/
public boolean match(PackageDoc packageDoc)
{
Iterator it = patterns.iterator();
while (it.hasNext()) {
Pattern pattern = (Pattern)it.next();
Matcher matcher = pattern.matcher(packageDoc.name());
if (matcher.matches()) {
return true;
}
}
return false;
}
public String toString()
{
return "PackageMatcher{patterns=" + patterns + "}";
}
}
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