/**
 *
 *  Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
 *
 *  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.apache.tuscany.container.extension.context;

import java.util.Map;

import org.apache.tuscany.core.context.AtomicContext;
import org.apache.tuscany.core.context.CoreRuntimeException;
import org.apache.tuscany.core.context.QualifiedName;
import org.apache.tuscany.core.context.TargetException;
import org.apache.tuscany.core.context.event.InstanceCreated;
import org.apache.tuscany.core.context.impl.AbstractContext;
import org.apache.tuscany.core.wire.ProxyCreationException;
import org.apache.tuscany.core.wire.TargetWireFactory;
import org.apache.tuscany.core.wire.WireFactory;

/**
 * Abstract component context.
 *
 */
public abstract class AbstractComponentContext extends AbstractContext implements AtomicContext {

    private Map<String, TargetWireFactory> targetProxyFactories;

    public AbstractComponentContext(String name, Map<String, TargetWireFactory> targetProxyFactories) {
        super(name);
        this.targetProxyFactories = targetProxyFactories;
    }

    public Object getInstance(QualifiedName qName) throws TargetException {
        return getInstance(qName, true);
    }

    /**
     * Init method.
     */
    public void init() throws TargetException {
    }

    /**
     * Detsroy method.
     */
    public void destroy() throws TargetException {
    }

    private synchronized Object getInstance(QualifiedName qName, boolean notify) throws TargetException {
        String portName = qName.getPortName();
        WireFactory targetFactory;
        if (portName != null) {
            targetFactory = targetProxyFactories.get(portName);
        } else {
            targetFactory = targetProxyFactories.values().iterator().next();
        }
        if (targetFactory == null) {
            TargetException e = new TargetException("Target service not found");
            e.setIdentifier(qName.getPortName());
            e.addContextName(getName());
            throw e;
        }
        try {
            Object proxy = targetFactory.createProxy();
            if (notify) {
                publish(new InstanceCreated(this));
            }
            return proxy;
        } catch (ProxyCreationException e) {
            TargetException te = new TargetException("Error returning target", e);
            e.setIdentifier(qName.getPortName());
            e.addContextName(getName());
            throw te;
        }
    }

    /**
     * Whether this context supports eager init.
     */
    public boolean isEagerInit() {
        return false;
    }

    /**
     * Whether this context is destroyable.
     */
    public boolean isDestroyable() {
        return false;
    }

    /**
     * Starts the context.
     */
    public void start() throws CoreRuntimeException {
    }

    /**
     * Stops the context.
     */
    public void stop() throws CoreRuntimeException {
    }

}