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package org.eclipse.aether.util.graph.transformer;

/*
 * 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 org.eclipse.aether.RepositoryException;
import org.eclipse.aether.util.artifact.JavaScopes;
import org.eclipse.aether.util.graph.transformer.ConflictResolver.ScopeContext;
import org.eclipse.aether.util.graph.transformer.ConflictResolver.ScopeDeriver;

/**
 * A scope deriver for use with {@link ConflictResolver} that supports the scopes from {@link JavaScopes}.
 */
public final class JavaScopeDeriver
    extends ScopeDeriver
{

    /**
     * Creates a new instance of this scope deriver.
     */
    public JavaScopeDeriver()
    {
    }

    @Override
    public void deriveScope( ScopeContext context )
        throws RepositoryException
    {
        context.setDerivedScope( getDerivedScope( context.getParentScope(), context.getChildScope() ) );
    }

    private String getDerivedScope( String parentScope, String childScope )
    {
        String derivedScope;

        if ( JavaScopes.SYSTEM.equals( childScope ) || JavaScopes.TEST.equals( childScope ) )
        {
            derivedScope = childScope;
        }
        else if ( parentScope == null || parentScope.length() <= 0 || JavaScopes.COMPILE.equals( parentScope ) )
        {
            derivedScope = childScope;
        }
        else if ( JavaScopes.TEST.equals( parentScope ) || JavaScopes.RUNTIME.equals( parentScope ) )
        {
            derivedScope = parentScope;
        }
        else if ( JavaScopes.SYSTEM.equals( parentScope ) || JavaScopes.PROVIDED.equals( parentScope ) )
        {
            derivedScope = JavaScopes.PROVIDED;
        }
        else
        {
            derivedScope = JavaScopes.RUNTIME;
        }

        return derivedScope;
    }

}