org.wisdom.framework.osgi.Clauses Maven / Gradle / Ivy
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* #%L
* Wisdom-Framework
* %%
* Copyright (C) 2013 - 2014 Wisdom Framework
* %%
* 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.
* #L%
*/
package org.wisdom.framework.osgi;
import com.google.common.base.Strings;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
/**
* Represents a parsed header value from an OSGi manifest.
* Code taken from BND.
*/
public class Clauses extends LinkedHashMap> {
private static final Logger LOGGER = LoggerFactory.getLogger(Clauses.class);
/**
* Standard OSGi header parser. This parser can handle the format:
*
* - clauses ::= clause ( ',' clause ) +
* - clause ::= name ( ';' name ) (';' key '=' value )
*
*
* The return structure is a Map of Map: Map {name => Map {attribute | directive} => value}.
*
* @param header the header to parse
* @return the clauses
*/
static public Clauses parse(String header) {
if (Strings.isNullOrEmpty(header)) {
return new Clauses();
}
Clauses result = new Clauses();
QuotedTokenizer qt = new QuotedTokenizer(header, ";=,");
char del;
do {
boolean hadAttribute = false;
Map clause = new LinkedHashMap<>();
List aliases = new ArrayList();
aliases.add(qt.nextToken());
del = qt.getSeparator();
while (del == ';') {
String name = qt.nextToken();
if ((del = qt.getSeparator()) != '=') {
// Found an ; or , - it's valid if we didn't find an attribute.
if (hadAttribute) {
throw new IllegalArgumentException("Header contains name field after " +
"attribute or directive: " + name + " from " + header);
}
aliases.add(name);
} else {
// Parse attribute or directive.
String value = qt.nextToken();
clause.put(name, value);
del = qt.getSeparator();
hadAttribute = true;
}
}
for (String packageName : aliases) {
if (result.containsKey(packageName)) {
LOGGER.warn("Duplicate package name in header: " + packageName
+ ". Multiple package names in one clause are supported.");
} else {
result.put(packageName, clause);
}
}
} while (del == ',');
return result;
}
}