com.acciente.induction.init.ViewResolverInitializer.java Source code

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Here is the source code for com.acciente.induction.init.ViewResolverInitializer.java

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/*
 * Copyright 2008-2013 Acciente, LLC
 *
 * Acciente, LLC licenses this file to you 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 com.acciente.induction.init;

import com.acciente.commons.lang.Strings;
import com.acciente.commons.reflect.ParameterProviderException;
import com.acciente.induction.dispatcher.model.ModelPool;
import com.acciente.induction.init.config.Config;
import com.acciente.induction.resolver.ShortURLViewResolver;
import com.acciente.induction.resolver.ViewResolver;
import com.acciente.induction.util.ConstructorNotFoundException;
import com.acciente.induction.util.ObjectFactory;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import javax.servlet.ServletConfig;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;

/**
 * Internal.
 * This is helper class that focuses on setting up the view resolver used
 * by the dispatcher servlet.
 *
 * @created Mar 30, 2009
 *
 * @author Adinath Raveendra Raj
 */
public class ViewResolverInitializer {
    public static ViewResolver getViewResolver(Config.ViewResolver oViewResolverConfig,
            Config.ViewMapping oViewMappingConfig, ModelPool oModelPool, ClassLoader oClassLoader,
            ServletConfig oServletConfig)
            throws ClassNotFoundException, InvocationTargetException, ConstructorNotFoundException,
            ParameterProviderException, IllegalAccessException, InstantiationException, IOException {
        ViewResolver oViewResolver;
        String sViewResolverClassName;
        Log oLog;

        oLog = LogFactory.getLog(ViewResolverInitializer.class);

        sViewResolverClassName = oViewResolverConfig.getClassName();

        if (Strings.isEmpty(sViewResolverClassName)) {
            oViewResolver = new ShortURLViewResolver(oViewMappingConfig, oClassLoader);
        } else {
            oLog.info("loading user-defined view resolver: " + sViewResolverClassName);

            Class oViewResolverClass = oClassLoader.loadClass(sViewResolverClassName);

            // attempt to find and call the single public constructor
            oViewResolver = (ViewResolver) ObjectFactory.createObject(oViewResolverClass,
                    new Object[] { oServletConfig, oViewResolverConfig, oViewMappingConfig, oClassLoader },
                    new InitializerParameterProvider(oModelPool, "view-resolver-init"));
        }

        return oViewResolver;
    }
}