AuthorizationNsHandler.java

/*
 * 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.blueprint.authorization.impl;

import java.net.URL;
import java.util.Collections;
import java.util.Set;

import org.apache.aries.blueprint.ComponentDefinitionRegistry;
import org.apache.aries.blueprint.NamespaceHandler;
import org.apache.aries.blueprint.ParserContext;
import org.apache.aries.blueprint.mutable.MutableBeanMetadata;
import org.apache.aries.blueprint.mutable.MutablePassThroughMetadata;
import org.osgi.service.blueprint.reflect.ComponentMetadata;
import org.osgi.service.blueprint.reflect.Metadata;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

public class AuthorizationNsHandler implements NamespaceHandler {
    private static final String NS_AUTHZ = "http://aries.apache.org/xmlns/authorization/v1.0.0";

    private void parseElement(Element elt, ComponentMetadata cm, ParserContext pc) {
        ComponentDefinitionRegistry cdr = pc.getComponentDefinitionRegistry();
        
        if ("enable".equals(elt.getLocalName()) && NS_AUTHZ.equals(elt.getNamespaceURI()) 
            && !cdr.containsComponentDefinition(AuthorizationBeanProcessor.AUTH_PROCESSOR_BEAN_NAME)) {
            cdr.registerComponentDefinition(authBeanProcessor(pc, cdr));
        }
    }

    private MutableBeanMetadata authBeanProcessor(ParserContext pc, ComponentDefinitionRegistry cdr) {
        MutableBeanMetadata meta = pc.createMetadata(MutableBeanMetadata.class);
        meta.setId(AuthorizationBeanProcessor.AUTH_PROCESSOR_BEAN_NAME);
        meta.setRuntimeClass(AuthorizationBeanProcessor.class);
        meta.setProcessor(true);
        meta.addProperty("cdr", passThrough(pc, cdr));
        return meta;
    }

    private MutablePassThroughMetadata passThrough(ParserContext pc, Object o) {
        MutablePassThroughMetadata meta = pc.createMetadata(MutablePassThroughMetadata.class);
        meta.setObject(o);
        return meta;
    }

    public ComponentMetadata decorate(Node node, ComponentMetadata cm, ParserContext pc) {
        if (node instanceof Element) {
            parseElement((Element)node, cm, pc);
        }
        return cm;
    }

    public Metadata parse(Element elt, ParserContext pc) {
        parseElement(elt, pc.getEnclosingComponent(), pc);
        return null;
    }

    public URL getSchemaLocation(String namespace) {
        if (NS_AUTHZ.equals(namespace)) {
            return this.getClass().getResource("/authz10.xsd");
        } else {
            return null;
        }
    }

    @SuppressWarnings("rawtypes")
    public Set<Class> getManagedClasses() {
        return Collections.emptySet();
    }

}