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/*
 * Copyright 2011 Red Hat inc. and third party contributors as noted 
 * by the author tags.
 * 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 com.redhat.ceylon.cmr.api;

import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;

import com.redhat.ceylon.cmr.spi.Node;
import com.redhat.ceylon.model.cmr.ArtifactResult;

/**
 * Plugable dependencies utils mechanism.
 *
 * @author Ales Justin
 */
public class DependencyResolvers {
    private final List resolvers = new CopyOnWriteArrayList<>();

    public void addResolver(DependencyResolver resolver) {
        addResolver(resolver, resolvers.size());
    }

    public void addResolver(DependencyResolver resolver, int index) {
        resolvers.add(index, resolver);
    }

    public void removeResolver(DependencyResolver resolver) {
        resolvers.remove(resolver);
    }

    public ModuleInfo resolve(ArtifactResult result, Overrides overrides) {
        for (DependencyResolver dr : resolvers) {
            ModuleInfo info = dr.resolve(result, overrides);
            if (info != null) {
                return info;
            }
        }
        return null;
    }

    public Node descriptor(Node artifact) {
        for (DependencyResolver dr : resolvers) {
            Node descriptor = dr.descriptor(artifact);
            if (descriptor != null)
                return descriptor;
        }
        return null;
    }

    @Override
    public String toString() {
        return resolvers.toString();
    }
}