export/src/main/java/org/apache/commons/graph/export/DefaultExportSelector.java

package org.apache.commons.graph.export;

/*
 * 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 static org.apache.commons.graph.utils.Assertions.checkNotNull;

import org.apache.commons.graph.Graph;

/**
 * {@link NamedExportSelector} implementation
 *
 * @param <V> the Graph vertices type.
 * @param <E> the Graph edges type.
 */
final class DefaultExportSelector<V, E>
    implements NamedExportSelector<V, E>
{

    private final Graph<V, E> graph;

    private String name = null;

    /**
     * Creates a new instance of export selector for the given graph
     * @param graph the graph
     */
    public DefaultExportSelector( Graph<V, E> graph )
    {
        this.graph = graph;
    }

    /**
     * {@inheritDoc}
     */
    public DotExporter<V, E> usingDotNotation()
    {
        return new DotExporter<V, E>( graph, name );
    }

    /**
     * {@inheritDoc}
     */
    public GraphMLExporter<V, E> usingGraphMLFormat()
    {
        return new GraphMLExporter<V, E>( graph, name );
    }

    /**
     * {@inheritDoc}
     */
    public ExportSelector<V, E> withName( String name )
    {
        this.name = checkNotNull( name, "Graph name cannot be null." );
        return this;
    }

}