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Neo4j kernel is a lightweight, embedded Java database designed to store data structured as graphs rather than tables. For more information, see http://neo4j.org.

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/**
 * Copyright (c) 2002-2013 "Neo Technology,"
 * Network Engine for Objects in Lund AB [http://neotechnology.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.neo4j.helpers;

import java.net.URI;

/**
 * Functions for working with URIs
 */
public final class Uris
{
    /**
     * Extract a named parameter from the query of a URI. If a parameter is set but no value defined,
     * then "true" is returned
     *
     * @param name of the parameter
     * @return value of named parameter or null if missing
     */
    public static Function parameter( final String name )
    {
        return new Function()
        {
            @Override
            public String apply( URI uri )
            {
                if ( uri == null )
                {
                    return null;
                }

                String query = uri.getQuery();
                for ( String param : query.split( "&" ) )
                {
                    String[] keyValue = param.split( "=" );

                    if ( keyValue[0].equalsIgnoreCase( name ) )
                    {
                        if ( keyValue.length == 2 )
                        {
                            return keyValue[1];
                        }
                        else
                        {
                            return "true";
                        }
                    }
                }
                return null;
            }
        };
    }

    private Uris()
    {
    }
}