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/*******************************************************************************
 * Copyright (c) 2010, 2011 Sonatype, Inc.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Sonatype, Inc. - initial API and implementation
 *******************************************************************************/
package org.eclipse.aether.graph;

/**
 * An exclusion of one or more transitive dependencies. Note: Instances of this class are immutable and the
 * exposed mutators return new objects rather than changing the current instance.
 * 
 * @see Dependency#getExclusions()
 */
public final class Exclusion
{

    private final String groupId;

    private final String artifactId;

    private final String classifier;

    private final String extension;

    /**
     * Creates an exclusion for artifacts with the specified coordinates.
     * 
     * @param groupId The group identifier, may be {@code null}.
     * @param artifactId The artifact identifier, may be {@code null}.
     * @param classifier The classifier, may be {@code null}.
     * @param extension The file extension, may be {@code null}.
     */
    public Exclusion( String groupId, String artifactId, String classifier, String extension )
    {
        this.groupId = ( groupId != null ) ? groupId : "";
        this.artifactId = ( artifactId != null ) ? artifactId : "";
        this.classifier = ( classifier != null ) ? classifier : "";
        this.extension = ( extension != null ) ? extension : "";
    }

    /**
     * Gets the group identifier for artifacts to exclude.
     * 
     * @return The group identifier, never {@code null}.
     */
    public String getGroupId()
    {
        return groupId;
    }

    /**
     * Gets the artifact identifier for artifacts to exclude.
     * 
     * @return The artifact identifier, never {@code null}.
     */
    public String getArtifactId()
    {
        return artifactId;
    }

    /**
     * Gets the classifier for artifacts to exclude.
     * 
     * @return The classifier, never {@code null}.
     */
    public String getClassifier()
    {
        return classifier;
    }

    /**
     * Gets the file extension for artifacts to exclude.
     * 
     * @return The file extension of artifacts to exclude, never {@code null}.
     */
    public String getExtension()
    {
        return extension;
    }

    @Override
    public String toString()
    {
        return getGroupId() + ':' + getArtifactId() + ':' + getExtension()
            + ( getClassifier().length() > 0 ? ':' + getClassifier() : "" );
    }

    @Override
    public boolean equals( Object obj )
    {
        if ( obj == this )
        {
            return true;
        }
        else if ( obj == null || !getClass().equals( obj.getClass() ) )
        {
            return false;
        }

        Exclusion that = (Exclusion) obj;

        return artifactId.equals( that.artifactId ) && groupId.equals( that.groupId )
            && extension.equals( that.extension ) && classifier.equals( that.classifier );
    }

    @Override
    public int hashCode()
    {
        int hash = 17;
        hash = hash * 31 + artifactId.hashCode();
        hash = hash * 31 + groupId.hashCode();
        hash = hash * 31 + classifier.hashCode();
        hash = hash * 31 + extension.hashCode();
        return hash;
    }

}