RoutesConfProvider.java

/*
 * Copyright (c) 2013 the original author or authors
 *
 * Licensed 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.
 */
package io.werval.runtime.routes;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.List;
import java.util.Scanner;

import io.werval.api.Application;
import io.werval.api.routes.Route;
import io.werval.util.Strings;
import io.werval.runtime.exceptions.WervalRuntimeException;

/**
 * Routes Provider using 'routes.conf' from the Application classpath root.
 */
public class RoutesConfProvider
    implements RoutesProvider
{
    private final String routesResourceName;

    public RoutesConfProvider()
    {
        this( "routes.conf" );
    }

    public RoutesConfProvider( String routesResourceName )
    {
        this.routesResourceName = routesResourceName;
    }

    @Override
    public List<Route> routes( Application application )
    {
        URL routesUrl = application.classLoader().getResource( routesResourceName );
        if( routesUrl == null )
        {
            return new RouteBuilderInstance( application ).parse().routes( Strings.EMPTY );
        }
        try( InputStream input = routesUrl.openStream() )
        {
            Scanner scanner = new Scanner( input, application.defaultCharset().name() ).useDelimiter( "\\A" );
            String routes = scanner.hasNext() ? scanner.next() : "";
            return new RouteBuilderInstance( application ).parse().routes( routes );
        }
        catch( IOException ex )
        {
            throw new WervalRuntimeException( "Unable to load routes.conf from the classpath", ex );
        }
    }
}