maven-resolver-api/src/main/java/org/eclipse/aether/metadata/DefaultMetadata.java

package org.eclipse.aether.metadata;

/*
 * 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.io.File;
import java.util.Map;

/**
 * A basic metadata instance. <em>Note:</em> Instances of this class are immutable and the exposed mutators return new
 * objects rather than changing the current instance.
 */
public final class DefaultMetadata
    extends AbstractMetadata
{

    private final String groupId;

    private final String artifactId;

    private final String version;

    private final String type;

    private final Nature nature;

    private final File file;

    private final Map<String, String> properties;

    /**
     * Creates a new metadata for the repository root with the specific type and nature.
     * 
     * @param type The type of the metadata, e.g. "maven-metadata.xml", may be {@code null}.
     * @param nature The nature of the metadata, must not be {@code null}.
     */
    public DefaultMetadata( String type, Nature nature )
    {
        this( "", "", "", type, nature, null, (File) null );
    }

    /**
     * Creates a new metadata for the groupId level with the specific type and nature.
     * 
     * @param groupId The group identifier to which this metadata applies, may be {@code null}.
     * @param type The type of the metadata, e.g. "maven-metadata.xml", may be {@code null}.
     * @param nature The nature of the metadata, must not be {@code null}.
     */
    public DefaultMetadata( String groupId, String type, Nature nature )
    {
        this( groupId, "", "", type, nature, null, (File) null );
    }

    /**
     * Creates a new metadata for the groupId:artifactId level with the specific type and nature.
     * 
     * @param groupId The group identifier to which this metadata applies, may be {@code null}.
     * @param artifactId The artifact identifier to which this metadata applies, may be {@code null}.
     * @param type The type of the metadata, e.g. "maven-metadata.xml", may be {@code null}.
     * @param nature The nature of the metadata, must not be {@code null}.
     */
    public DefaultMetadata( String groupId, String artifactId, String type, Nature nature )
    {
        this( groupId, artifactId, "", type, nature, null, (File) null );
    }

    /**
     * Creates a new metadata for the groupId:artifactId:version level with the specific type and nature.
     * 
     * @param groupId The group identifier to which this metadata applies, may be {@code null}.
     * @param artifactId The artifact identifier to which this metadata applies, may be {@code null}.
     * @param version The version to which this metadata applies, may be {@code null}.
     * @param type The type of the metadata, e.g. "maven-metadata.xml", may be {@code null}.
     * @param nature The nature of the metadata, must not be {@code null}.
     */
    public DefaultMetadata( String groupId, String artifactId, String version, String type, Nature nature )
    {
        this( groupId, artifactId, version, type, nature, null, (File) null );
    }

    /**
     * Creates a new metadata for the groupId:artifactId:version level with the specific type and nature.
     * 
     * @param groupId The group identifier to which this metadata applies, may be {@code null}.
     * @param artifactId The artifact identifier to which this metadata applies, may be {@code null}.
     * @param version The version to which this metadata applies, may be {@code null}.
     * @param type The type of the metadata, e.g. "maven-metadata.xml", may be {@code null}.
     * @param nature The nature of the metadata, must not be {@code null}.
     * @param file The resolved file of the metadata, may be {@code null}.
     */
    public DefaultMetadata( String groupId, String artifactId, String version, String type, Nature nature, File file )
    {
        this( groupId, artifactId, version, type, nature, null, file );
    }

    /**
     * Creates a new metadata for the groupId:artifactId:version level with the specific type and nature.
     * 
     * @param groupId The group identifier to which this metadata applies, may be {@code null}.
     * @param artifactId The artifact identifier to which this metadata applies, may be {@code null}.
     * @param version The version to which this metadata applies, may be {@code null}.
     * @param type The type of the metadata, e.g. "maven-metadata.xml", may be {@code null}.
     * @param nature The nature of the metadata, must not be {@code null}.
     * @param properties The properties of the metadata, may be {@code null} if none.
     * @param file The resolved file of the metadata, may be {@code null}.
     */
    public DefaultMetadata( String groupId, String artifactId, String version, String type, Nature nature,
                            Map<String, String> properties, File file )
    {
        this.groupId = emptify( groupId );
        this.artifactId = emptify( artifactId );
        this.version = emptify( version );
        this.type = emptify( type );
        if ( nature == null )
        {
            throw new IllegalArgumentException( "metadata nature was not specified" );
        }
        this.nature = nature;
        this.file = file;
        this.properties = copyProperties( properties );
    }

    DefaultMetadata( String groupId, String artifactId, String version, String type, Nature nature, File file,
                     Map<String, String> properties )
    {
        // NOTE: This constructor assumes immutability of the provided properties, for internal use only
        this.groupId = emptify( groupId );
        this.artifactId = emptify( artifactId );
        this.version = emptify( version );
        this.type = emptify( type );
        this.nature = nature;
        this.file = file;
        this.properties = properties;
    }

    private static String emptify( String str )
    {
        return ( str == null ) ? "" : str;
    }

    public String getGroupId()
    {
        return groupId;
    }

    public String getArtifactId()
    {
        return artifactId;
    }

    public String getVersion()
    {
        return version;
    }

    public String getType()
    {
        return type;
    }

    public Nature getNature()
    {
        return nature;
    }

    public File getFile()
    {
        return file;
    }

    public Map<String, String> getProperties()
    {
        return properties;
    }

}