NuunOptionMembersInjector.java

/**
 * Copyright (C) 2013 Kametic <epo.jemba@kametic.com>
 *
 * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE, Version 3, 29 June 2007;
 * or any later version
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.gnu.org/licenses/lgpl-3.0.txt
 *
 * 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.nuunframework.cli;

import java.lang.annotation.Annotation;
import java.lang.reflect.Field;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.lang.StringUtils;
import org.nuunframework.kernel.commons.AssertUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.inject.MembersInjector;

/**
 * @author ejemba
 *
 */
public class NuunOptionMembersInjector<T> implements MembersInjector<T> 
{
    
    Logger logger = LoggerFactory.getLogger(NuunOptionMembersInjector.class);
    
    private Field field;
    private Annotation clonedAnno;
    private CommandLine commandLine;

    /**
     * 
     */
    public NuunOptionMembersInjector(Field field, CommandLine commandLine , Annotation clonedAnno)
    {
        this.field = field;
        this.commandLine = commandLine;
        this.clonedAnno = clonedAnno;
    }
    
    /* (non-Javadoc)
     * @see com.google.inject.MembersInjector#injectMembers(java.lang.Object)
     */
    @Override
    public void injectMembers(T instance)
    {
        Object value = null;
        NuunOption optionAnno = null;
        
        if (clonedAnno.annotationType() == NuunOption.class)
        {
            optionAnno = this.field.getAnnotation(NuunOption.class);
        }
        else 
        {
            optionAnno = AssertUtils.annotationProxyOf(NuunOption.class, this.clonedAnno);
        }
        
        String opt = optionAnno.opt();
        
        if ( ! StringUtils.isBlank(opt))
        {
            if(commandLine.hasOption(opt))
            {
                if (optionAnno.arg()  && ! optionAnno.args())
                {
                    value = commandLine.getOptionValue(opt);
                    
                    if (StringUtils.isEmpty((String) value));
                    {
                        if (! optionAnno.optionalArg())
                        {
                            // THROW ERRORS 
                        }
                    }
                }
                
                if ( ! optionAnno.arg()  && ! optionAnno.args() )
                {
                    value = commandLine.hasOption(opt);
                }
                
                if (optionAnno.args())
                {
                    value = commandLine.getOptionValues(opt);
                }
            }
        } 
        else if ( ! StringUtils.isBlank(optionAnno.longOpt()))
        {
            
        }
        
        
        
        try
        {
            this.field.setAccessible(true);
            this.field.set(instance, value);
        }
        catch (IllegalArgumentException ex)
        {
            logger.error("Wrong argument or argument type during configuration injection", ex);
        }
        catch (IllegalAccessException ex)
        {
            logger.error("Illegal access during configuration injection", ex);
        }
        finally
        {
            this.field.setAccessible(false);
        }
    }

}