/*
 * 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.subsystem.core.archive;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import org.apache.aries.subsystem.core.internal.AbstractRequirement;
import org.osgi.framework.namespace.HostNamespace;
import org.osgi.resource.Resource;

public class FragmentHostRequirement extends AbstractRequirement {
    public static final String DIRECTIVE_EXTENSION = HostNamespace.REQUIREMENT_EXTENSION_DIRECTIVE;
	public static final String DIRECTIVE_FILTER = HostNamespace.REQUIREMENT_FILTER_DIRECTIVE;
	public static final String NAMESPACE = HostNamespace.HOST_NAMESPACE;
	
	private final Map<String, String> directives;
	private final Resource resource;
	
	public FragmentHostRequirement(
			FragmentHostHeader.Clause clause, Resource resource) {
		directives = new HashMap<String, String>(clause.getDirectives().size() + 1);
		for (Directive directive : clause.getDirectives())
			directives.put(directive.getName(), directive.getValue());
		StringBuilder builder = new StringBuilder("(&(")
				.append(NAMESPACE).append('=')
				.append(clause.getSymbolicName()).append(')');
		for (Attribute attribute : clause.getAttributes())
			attribute.appendToFilter(builder);
		directives.put(DIRECTIVE_FILTER, builder.append(')').toString());
		this.resource = resource;
	}

	@Override
	public Map<String, Object> getAttributes() {
		return Collections.emptyMap();
	}

	@Override
	public Map<String, String> getDirectives() {
		return Collections.unmodifiableMap(directives);
	}

	@Override
	public String getNamespace() {
		return NAMESPACE;
	}

	@Override
	public Resource getResource() {
		return resource;
	}
}
