/* | |
* $Header: /cvshome/build/org.osgi.service.condpermadmin/src/org/osgi/service/condpermadmin/BundleLocationCondition.java,v 1.17 2006/03/14 01:20:40 hargrave Exp $ | |
* | |
* Copyright (c) OSGi Alliance (2005). All Rights Reserved. | |
* | |
* Licensed under the Apache License, Version 2.0 (the "License"); | |
* you may not use this file except in compliance with the License. | |
* You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, | |
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
* See the License for the specific language governing permissions and | |
* limitations under the License. | |
*/ | |
package org.osgi.service.condpermadmin; | |
import java.security.AccessController; | |
import java.security.PrivilegedAction; | |
import java.util.Hashtable; | |
import org.osgi.framework.*; | |
/** | |
* Condition to test if the location of a bundle matches a pattern. Pattern | |
* matching is done according to the filter string matching rules. | |
* | |
* @version $Revision: 1.17 $ | |
*/ | |
public class BundleLocationCondition { | |
private static final String CONDITION_TYPE = "org.osgi.service.condpermadmin.BundleLocationCondition"; | |
/** | |
* Constructs a condition that tries to match the passed Bundle's location | |
* to the location pattern. | |
* | |
* @param bundle The Bundle being evaluated. | |
* @param info The ConditionInfo to construct the condition for. The args of | |
* the ConditionInfo must be a single String which specifies the | |
* location pattern to match against the Bundle location. Matching is | |
* done according to the filter string matching rules. Any '*' | |
* characters in the location argument are used as wildcards when | |
* matching bundle locations unless they are escaped with a '\' | |
* character. | |
* @return Condition object for the requested condition. | |
*/ | |
static public Condition getCondition(final Bundle bundle, ConditionInfo info) { | |
if (!CONDITION_TYPE.equals(info.getType())) | |
throw new IllegalArgumentException( | |
"ConditionInfo must be of type \"" + CONDITION_TYPE + "\""); | |
String[] args = info.getArgs(); | |
if (args.length != 1) | |
throw new IllegalArgumentException("Illegal number of args: " | |
+ args.length); | |
String bundleLocation = (String) AccessController | |
.doPrivileged(new PrivilegedAction() { | |
public Object run() { | |
return bundle.getLocation(); | |
} | |
}); | |
Filter filter = null; | |
try { | |
filter = FrameworkUtil.createFilter("(location=" | |
+ escapeLocation(args[0]) + ")"); | |
} | |
catch (InvalidSyntaxException e) { | |
// this should never happen, but just incase | |
throw new RuntimeException("Invalid filter: " + e.getFilter()); | |
} | |
Hashtable matchProps = new Hashtable(2); | |
matchProps.put("location", bundleLocation); | |
return filter.match(matchProps) ? Condition.TRUE : Condition.FALSE; | |
} | |
private BundleLocationCondition() { | |
// private constructor to prevent objects of this type | |
} | |
/** | |
* Escape the value string such that '(', ')' and '\' are escaped. The '\' | |
* char is only escaped if it is not followed by a '*'. | |
* | |
* @param value unescaped value string. | |
* @return escaped value string. | |
*/ | |
private static String escapeLocation(String value) { | |
boolean escaped = false; | |
int inlen = value.length(); | |
int outlen = inlen << 1; /* inlen * 2 */ | |
char[] output = new char[outlen]; | |
value.getChars(0, inlen, output, inlen); | |
int cursor = 0; | |
for (int i = inlen; i < outlen; i++) { | |
char c = output[i]; | |
switch (c) { | |
case '\\' : | |
if (i + 1 < outlen && output[i + 1] == '*') | |
break; | |
case '(' : | |
case ')' : | |
output[cursor] = '\\'; | |
cursor++; | |
escaped = true; | |
break; | |
} | |
output[cursor] = c; | |
cursor++; | |
} | |
return escaped ? new String(output, 0, cursor) : value; | |
} | |
} |