package org.apache.maven.repository.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.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.apache.maven.artifact.ArtifactScopeEnum;

/**
 * classpath container that is aware of the classpath scope
 *
 * @author <a href="oleg@codehaus.org">Oleg Gusakov</a>
 *
 */
public class ClasspathContainer
implements Iterable<ArtifactMetadata>
{
    private List<ArtifactMetadata> classpath;

    private ArtifactScopeEnum scope;

    // -------------------------------------------------------------------------------------------
    public ClasspathContainer( ArtifactScopeEnum scope )
    {
        this.scope = ArtifactScopeEnum.checkScope( scope );
    }

    // -------------------------------------------------------------------------------------------
    public ClasspathContainer( List<ArtifactMetadata> classpath, ArtifactScopeEnum scope )
    {
        this( scope );
        this.classpath = classpath;
    }

    // -------------------------------------------------------------------------------------------
    public Iterator<ArtifactMetadata> iterator()
    {
        return classpath == null ? null : classpath.iterator();
    }

    // -------------------------------------------------------------------------------------------
    public ClasspathContainer add( ArtifactMetadata md )
    {
        if ( classpath == null )
        {
            classpath = new ArrayList<ArtifactMetadata>( 16 );
        }

        classpath.add( md );

        return this;
    }

    // -------------------------------------------------------------------------------------------
    public List<ArtifactMetadata> getClasspath()
    {
        return classpath;
    }

    // -------------------------------------------------------------------------------------------
    public MetadataTreeNode getClasspathAsTree()
        throws MetadataResolutionException
    {
        if ( classpath == null || classpath.size() < 1 )
        {
            return null;
        }

        MetadataTreeNode tree = null;
        MetadataTreeNode parent = null;

        for ( ArtifactMetadata md : classpath )
        {
            MetadataTreeNode node = new MetadataTreeNode( md, parent, md.isResolved(), md.getArtifactScope() );
            if ( tree == null )
            {
                tree = node;
            }

            if ( parent != null )
            {
                parent.setNChildren( 1 );
                parent.addChild( 0, node );
            }

            parent = node;

        }
        return tree;
    }

    public void setClasspath( List<ArtifactMetadata> classpath )
    {
        this.classpath = classpath;
    }

    public ArtifactScopeEnum getScope()
    {
        return scope;
    }

    public void setScope( ArtifactScopeEnum scope )
    {
        this.scope = scope;
    }

    // -------------------------------------------------------------------------------------------
    @Override
    public String toString()
    {
        StringBuilder sb = new StringBuilder( 256 );
        sb.append( "[scope=" ).append( scope.getScope() );
        if ( classpath != null )
        {
            for ( ArtifactMetadata md : classpath )
            {
                sb.append( ": " ).append( md.toString() ).append( '{' ).append( md.getArtifactUri() ).append( '}' );
            }
        }
        sb.append( ']' );
        return sb.toString();
    }
    // -------------------------------------------------------------------------------------------
    // -------------------------------------------------------------------------------------------
}