org.commonjava.web.config.DefaultConfigurationRegistry Maven / Gradle / Ivy

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/*******************************************************************************
 * Copyright 2011 John Casey
 * 
 * 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 org.commonjava.web.config;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

import org.commonjava.web.config.section.ConfigurationSectionListener;

public class DefaultConfigurationRegistry
    implements ConfigurationRegistry
{
    private final Collection listeners;

    private Map> sectionMap;

    public DefaultConfigurationRegistry()
    {
        listeners = new ArrayList();
    }

    public DefaultConfigurationRegistry( final Class... types )
        throws ConfigurationException
    {
        this( new DefaultConfigurationListener( types ) );
    }

    public DefaultConfigurationRegistry( final ConfigurationSectionListener... sectionListeners )
        throws ConfigurationException
    {
        this( new DefaultConfigurationListener( sectionListeners ) );
    }

    public DefaultConfigurationRegistry( final ConfigurationListener... listeners )
        throws ConfigurationException
    {
        this.listeners = Arrays.asList( listeners );
        mapSectionListeners();
    }

    public DefaultConfigurationRegistry( final Object... data )
        throws ConfigurationException
    {
        listeners = new ArrayList();
        for ( final Object d : data )
        {
            if ( d instanceof ConfigurationListener )
            {
                with( (ConfigurationListener) d );
            }
            else if ( d instanceof ConfigurationSectionListener )
            {
                with( (ConfigurationSectionListener) d );
            }
            else if ( d instanceof Class )
            {
                with( (Class) d );
            }
            else
            {
                throw new ConfigurationException( "Invalid input for configuration registry: %s", d );
            }
        }
    }

    public DefaultConfigurationRegistry with( final ConfigurationListener listener )
        throws ConfigurationException
    {
        listeners.add( listener );
        mapListener( listener );
        return this;
    }

    public DefaultConfigurationRegistry with( final ConfigurationSectionListener listener )
        throws ConfigurationException
    {
        final DefaultConfigurationListener dcl = new DefaultConfigurationListener( listener );
        listeners.add( dcl );
        mapListener( dcl );
        return this;
    }

    public DefaultConfigurationRegistry with( final Class type )
        throws ConfigurationException
    {
        final DefaultConfigurationListener dcl = new DefaultConfigurationListener( type );
        listeners.add( dcl );
        mapListener( dcl );
        return this;
    }

    @Override
    public void configurationParsed()
        throws ConfigurationException
    {
        if ( listeners != null )
        {
            for ( final ConfigurationListener listener : listeners )
            {
                listener.configurationComplete();
            }
        }
        else
        {
            // TODO: Log to debug level!
        }
    }

    @Override
    public boolean sectionStarted( final String name )
        throws ConfigurationException
    {
        final ConfigurationSectionListener listener = sectionMap.get( name );
        if ( listener != null )
        {
            listener.sectionStarted( name );
            return true;
        }

        return false;
    }

    @Override
    public void sectionComplete( final String name )
        throws ConfigurationException
    {
        final ConfigurationSectionListener listener = sectionMap.get( name );
        if ( listener != null )
        {
            listener.sectionComplete( name );
        }
    }

    @Override
    public void parameter( final String section, final String name, final String value )
        throws ConfigurationException
    {
        final ConfigurationSectionListener secListener = sectionMap.get( section );
        secListener.parameter( name, value );
    }

    protected synchronized void mapSectionListeners()
        throws ConfigurationException
    {
        if ( listeners != null )
        {
            for ( final ConfigurationListener listener : listeners )
            {
                mapListener( listener );
            }
        }
        else
        {
            // TODO: Log to debug level!
        }
    }

    private void mapListener( final ConfigurationListener listener )
        throws ConfigurationException
    {
        if ( sectionMap == null )
        {
            sectionMap = new HashMap>();
        }

        final Map> parsers = listener.getSectionListeners();
        for ( final Map.Entry> entry : parsers.entrySet() )
        {
            final String section = entry.getKey();
            if ( sectionMap.containsKey( section ) )
            {
                throw new ConfigurationException(
                                                  "Section collision! More than one ConfigurationParser bound to section: %s\n\t%s\n\t%s",
                                                  section, sectionMap.get( section ), entry.getValue() );
            }

            sectionMap.put( section, entry.getValue() );
        }
    }

}