com.novell.ldapchai.provider.ReadOnlyWrapper Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of ldapchai Show documentation
The LDAP Chai API, easy to use LDAP for Java developers.
There is a newer version: 0.8.7
/*
 * LDAP Chai API
 * Copyright (c) 2006-2017 Novell, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package com.novell.ldapchai.provider;

import com.novell.ldapchai.exception.ChaiError;
import com.novell.ldapchai.exception.ChaiOperationException;
import com.novell.ldapchai.util.internal.ChaiLogger;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

/**
 * Read only wrapper.
 *
 * @author Jason D. Rivard
 * @see com.novell.ldapchai.provider.ChaiSetting#READONLY
 */
class ReadOnlyWrapper implements InvocationHandler
{


    private static final ChaiLogger LOGGER = ChaiLogger.getLogger( ReadOnlyWrapper.class );

    /**
     * The standard wrapper manages updating statistics and handling the wire trace functionality.
     */
    private ChaiProviderImplementor realProvider;

    static ChaiProviderImplementor forProvider( final ChaiProviderImplementor chaiProvider )
    {
        if ( Proxy.isProxyClass( chaiProvider.getClass() ) && chaiProvider instanceof ReadOnlyWrapper )
        {
            LOGGER.warn( () -> "attempt to obtain ReadOnlyWrapper wrapper for already wrapped Provider." );
            return chaiProvider;
        }

        return ( ChaiProviderImplementor ) Proxy.newProxyInstance(
                chaiProvider.getClass().getClassLoader(),
                chaiProvider.getClass().getInterfaces(),
                new ReadOnlyWrapper( chaiProvider ) );
    }

    private ReadOnlyWrapper( final ChaiProviderImplementor realProvider )
    {
        this.realProvider = realProvider;
    }

    @Override
    public Object invoke( final Object proxy, final Method method, final Object[] args )
            throws Throwable
    {
        final boolean isModify = method.getAnnotation( ChaiProviderImplementor.ModifyOperation.class ) != null;

        if ( isModify )
        {
            throw new ChaiOperationException( "attempt to make ldap modifaction, but Chai is configured for read-only",
                    ChaiError.READ_ONLY_VIOLATION,
                    true,
                    false );
        }

        try
        {
            return method.invoke( realProvider, args );
        }
        catch ( InvocationTargetException e )
        {
            throw e.getCause();
        }
    }
}