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This framework extension fragment contains an extender that facilitates the use of JRE SPI providers (components typically plugged in to the JRE through META-INF/services resources).

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.aries.spifly;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class ArgRestrictions {
    private final Map, List> restrictions = 
            new HashMap, List>();
    
    public void addRestriction(int argNumber, String className) {
        addRestriction(argNumber, className, null);
    }

    public void addRestriction(int argNumber, String className, String allowedArgValue) {
        Pair key = new Pair(argNumber, className);
        List allowedValues = restrictions.get(key);
        if (allowedArgValue != null) {
            if (allowedValues == null) {
                allowedValues = new ArrayList();
                restrictions.put(key, allowedValues);
            }            
            allowedValues.add(allowedArgValue);            
        }
        restrictions.put(key, allowedValues);
    }

    public String[] getArgClasses() {
        List classes = new ArrayList();
        for (Pair key : restrictions.keySet()) {
            classes.add(key.getRight());
        }
        
        if (classes.size() == 0)
            return null;
        return classes.toArray(new String [classes.size()]);
    }

    public boolean matches(Map, String> args) {
        for (Pair key : args.keySet()) {
            if (!restrictions.containsKey(key)) {
                return false;
            }
            
            List values = restrictions.get(key);
            if (values != null) {
                String val = args.get(key);
                if (!values.contains(val)) {
                    return false;
                }
            }
        }
        return true;        
    }
}