package org.eclipse.aether.repository;

/*
 * 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.
 */

import java.util.Collections;
import java.util.List;

import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.artifact.Artifact;

/**
 * A query to the local repository for the existence of an artifact.
 * 
 * @see LocalRepositoryManager#find(RepositorySystemSession, LocalArtifactRequest)
 */
public final class LocalArtifactRequest
{

    private Artifact artifact;

    private String context = "";

    private List<RemoteRepository> repositories = Collections.emptyList();

    /**
     * Creates an uninitialized query.
     */
    public LocalArtifactRequest()
    {
        // enables default constructor
    }

    /**
     * Creates a query with the specified properties.
     * 
     * @param artifact The artifact to query for, may be {@code null}.
     * @param repositories The remote repositories that should be considered as potential sources for the artifact, may
     *            be {@code null} or empty to only consider locally installed artifacts.
     * @param context The resolution context for the artifact, may be {@code null}.
     */
    public LocalArtifactRequest( Artifact artifact, List<RemoteRepository> repositories, String context )
    {
        setArtifact( artifact );
        setRepositories( repositories );
        setContext( context );
    }

    /**
     * Gets the artifact to query for.
     * 
     * @return The artifact or {@code null} if not set.
     */
    public Artifact getArtifact()
    {
        return artifact;
    }

    /**
     * Sets the artifact to query for.
     * 
     * @param artifact The artifact, may be {@code null}.
     * @return This query for chaining, never {@code null}.
     */
    public LocalArtifactRequest setArtifact( Artifact artifact )
    {
        this.artifact = artifact;
        return this;
    }

    /**
     * Gets the resolution context.
     * 
     * @return The resolution context, never {@code null}.
     */
    public String getContext()
    {
        return context;
    }

    /**
     * Sets the resolution context.
     * 
     * @param context The resolution context, may be {@code null}.
     * @return This query for chaining, never {@code null}.
     */
    public LocalArtifactRequest setContext( String context )
    {
        this.context = ( context != null ) ? context : "";
        return this;
    }

    /**
     * Gets the remote repositories to consider as sources of the artifact.
     * 
     * @return The remote repositories, never {@code null}.
     */
    public List<RemoteRepository> getRepositories()
    {
        return repositories;
    }

    /**
     * Sets the remote repositories to consider as sources of the artifact.
     * 
     * @param repositories The remote repositories, may be {@code null} or empty to only consider locally installed
     *            artifacts.
     * @return This query for chaining, never {@code null}.
     */
    public LocalArtifactRequest setRepositories( List<RemoteRepository> repositories )
    {
        if ( repositories != null )
        {
            this.repositories = repositories;
        }
        else
        {
            this.repositories = Collections.emptyList();
        }
        return this;
    }

    @Override
    public String toString()
    {
        return getArtifact() + " @ " + getRepositories();
    }

}