/*
 * Copyright 2008 the original author or authors.
 *
 * 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.wamblee.system.graph.component;

import org.wamblee.system.graph.Edge;
import org.wamblee.system.graph.EdgeFilter;

/**
 * Filter used to explicitly connect required and provided interfaces within a
 * container.
 * 
 * @author Erik Brakkee
 */
public class ConnectExternalProvidedProvidedFilter implements EdgeFilter {
    private String externalProvided;

    private String component;

    private String provided;

    /**
     * Creates a new ConnectExternalProvidedProvidedFilter object.
     * 
     */
    public ConnectExternalProvidedProvidedFilter(String aExternalProvided,
        String aComponent, String aProvided) {
        externalProvided = aExternalProvided;
        component = aComponent;
        provided = aProvided;

        if (externalProvided == null) {
            throw new IllegalArgumentException(
                "External provided interface name must be specified.");
        }

        if (component == null) {
            throw new IllegalArgumentException(
                "Component name must be specified");
        }

        if (provided == null) {
            throw new IllegalArgumentException(
                "Provided interface name of internal component must be specified");
        }
    }

    @Override
    public boolean isViolated(Edge aEdge) {
        if (aEdge.getFrom() instanceof ExternalProvidedInterfaceNode &&
            aEdge.getTo() instanceof ProvidedInterfaceNode) {
            return isViolated((ExternalProvidedInterfaceNode) aEdge.getFrom(),
                (ProvidedInterfaceNode) aEdge.getTo());
        }

        return false;
    }

    private boolean isViolated(ExternalProvidedInterfaceNode aFrom,
        ProvidedInterfaceNode aTo) {
        if (!aFrom.getName().equals(externalProvided)) {
            return false; // wrong provided interface.
        }

        if (aTo.getComponent().getName().equals(component) &&
            aTo.getProvided().getName().equals(provided)) {
            return false; // ok
        }

        return true;
    }
}