Application: gvSIG desktop

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 gvSIG Association.

 *

 * This program 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, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.fmap.dal.impl;

import org.gvsig.fmap.dal.ExternalStoreProviderFactory;

import java.lang.reflect.Constructor;

import org.gvsig.fmap.dal.DataFactoryUnit;

import org.gvsig.fmap.dal.DataParameters;

import org.gvsig.fmap.dal.DataStoreProvider;

import org.gvsig.fmap.dal.exception.InitializeException;

import org.gvsig.fmap.dal.spi.AbstractDataStoreProviderFactory;

import org.gvsig.fmap.dal.spi.DataStoreProviderServices;

import org.gvsig.tools.dynobject.DynObject;

import org.gvsig.tools.service.spi.Services;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

@SuppressWarnings("UseSpecificCatch")

public class DataStoreProviderToCoverageProviderFactoryWrapper extends

        AbstractDataStoreProviderFactory implements ExternalStoreProviderFactory {

    private static final Logger LOGGER = LoggerFactory.getLogger(DataStoreProviderToCoverageProviderFactoryWrapper.class);

    private Class providerClass = null;

    private Class parametersClass = null;

    public DataStoreProviderToCoverageProviderFactoryWrapper(String name, String description,

            Class provider, Class parametersClass) {

        super(name, description);

        this.providerClass = provider;

        this.parametersClass = parametersClass;

        LOGGER.warn("Creating wrapper for old style CoverageProvider (" + providerClass.getName() + ").");

    }

    @Override

    public DataFactoryUnit create(DynObject parameters, Services providerServices) {

        try {

            return this.createProvider(

                    (DataParameters) parameters,

                    (DataStoreProviderServices) providerServices

            );

        } catch (InitializeException ex) {

            throw new RuntimeException(ex);

        }

    }

    @Override

    public DataStoreProvider createProvider(

            DataParameters parameters,

            DataStoreProviderServices providerServices

    ) throws InitializeException {

        try {

            Class[] argsTypes = new Class[]{DataParameters.class,

                DataStoreProviderServices.class};

            Object[] args = new Object[]{parameters, providerServices};

            Constructor contructor;

            contructor = findConstructor(providerClass, argsTypes);

            return (DataStoreProvider) contructor.newInstance(args);

        } catch (Throwable e) {

            throw new InitializeException(e);

        }

    }

    @Override

    public final DynObject createParameters() {

        try {

            return (DynObject) parametersClass.newInstance();

        } catch (Exception e) {

            throw new RuntimeException(e);

        }

    }

    protected Constructor findConstructor(Class clazz, Class[] types)

            throws SecurityException, NoSuchMethodException {

        try {

            return clazz.getConstructor(types);

        } catch (NoSuchMethodException e) {

            // Nothing to do

        }

        // search for the required constructor

        Constructor[] constrs = clazz.getConstructors();

        boolean allMatch;

        for (Constructor constr : constrs) {

            Class[] paramTypes = constr.getParameterTypes();

            if (paramTypes.length == types.length) {

                // a general candidate

                allMatch = true;

                for (int j = 0; j < paramTypes.length; j++) {

                    if (!isParameterCompatible(types[j], paramTypes[j])) {

                        allMatch = false;

                        break;

                    }

                }

                if (allMatch) {

                    return constr;

                }

            }

        }

        StringBuilder strb = new StringBuilder();

        strb.append(clazz.getName());

        strb.append('(');

        if (types.length > 0) {

            for (int i = 0; i < types.length - 1; i++) {

                strb.append(types[i].getName());

                strb.append(',');

            }

            strb.append(types[types.length - 1].getName());

        }

        strb.append(')');

        throw new NoSuchMethodException(strb.toString());

    }

    private boolean isParameterCompatible(Class current, Class defined) {

        if (current == null) {

            return !defined.isPrimitive();

        } else {

            return current.isAssignableFrom(defined);

        }

    }

}