experimental/trunk_core_with_pluggable_logger/core/src/main/java/org/apache/myfaces/extensions/validator/core/ExtValContext.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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 org.apache.myfaces.extensions.validator.core;

import org.apache.myfaces.extensions.validator.core.initializer.component.ComponentInitializer;
import org.apache.myfaces.extensions.validator.core.initializer.component.DefaultComponentInitializer;
import org.apache.myfaces.extensions.validator.core.interceptor.RendererInterceptor;
import org.apache.myfaces.extensions.validator.core.recorder.ProcessedInformationRecorder;
import org.apache.myfaces.extensions.validator.core.factory.FactoryFinder;
import org.apache.myfaces.extensions.validator.core.factory.DefaultFactoryFinder;
import org.apache.myfaces.extensions.validator.internal.UsageCategory;
import org.apache.myfaces.extensions.validator.internal.UsageInformation;
import org.apache.myfaces.extensions.validator.util.ClassUtils;
import org.apache.myfaces.extensions.validator.util.ELUtils;

import javax.faces.context.FacesContext;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author Gerhard Petracek
 * @since 1.x.1
 */
@UsageInformation(UsageCategory.API)
public class ExtValContext
{
    private static ExtValContext extValContext = new ExtValContext();

    private FactoryFinder factoryFinder = new DefaultFactoryFinder();
    private Map<String, RendererInterceptor> rendererInterceptors = new HashMap<String, RendererInterceptor>();
    private List<String> deniedInterceptors = new ArrayList<String>();
    private List<ProcessedInformationRecorder> processedInformationRecorders =
        new ArrayList<ProcessedInformationRecorder>();

    public static ExtValContext getContext()
    {
        return extValContext;
    }

    public FactoryFinder getFactoryFinder()
    {
        return factoryFinder;
    }

    public void setFactoryFinder(FactoryFinder factoryFinder)
    {
        if(factoryFinder != null)
        {
            this.factoryFinder = factoryFinder;
        }
    }

    public List<RendererInterceptor> getRendererInterceptors()
    {
        return new ArrayList<RendererInterceptor>(rendererInterceptors.values());
    }

    public boolean registerRendererInterceptor(RendererInterceptor rendererInterceptor)
    {
        synchronized (ExtValContext.class)
        {
            if (deniedInterceptors.contains(rendererInterceptor.getInterceptorId()))
            {
                return false;
            }

            rendererInterceptors.put(rendererInterceptor.getInterceptorId(), rendererInterceptor);
        }
        return true;
    }

    public void deregisterRendererInterceptor(Class rendererInterceptorClass)
    {
        RendererInterceptor rendererInterceptor =
            (RendererInterceptor) ClassUtils.tryToInstantiateClass(rendererInterceptorClass);

        synchronized (ExtValContext.class)
        {
            rendererInterceptors.remove(rendererInterceptor.getInterceptorId());
        }
    }

    //if an interceptor hasn't been registered so far, it should be denied at future registrations
    public void denyRendererInterceptor(Class rendererInterceptorClass)
    {
        RendererInterceptor rendererInterceptor =
            (RendererInterceptor) ClassUtils.tryToInstantiateClass(rendererInterceptorClass);

        synchronized (ExtValContext.class)
        {
            deniedInterceptors.add(rendererInterceptor.getInterceptorId());
        }
        deregisterRendererInterceptor(rendererInterceptorClass);
    }

    public void addComponentInitializer(ComponentInitializer componentInitializer)
    {
        DefaultComponentInitializer.addComponentInitializer(componentInitializer);
    }

    public List<ProcessedInformationRecorder> getProcessedInformationRecorders()
    {
        return processedInformationRecorders;
    }

    public void addProcessedInformationRecorder(ProcessedInformationRecorder processedInformationRecorder)
    {
        this.processedInformationRecorders.add(processedInformationRecorder);
    }

    public InformationProviderBean getInformationProviderBean()
    {
        Map applicationMap = FacesContext.getCurrentInstance().getExternalContext().getApplicationMap();
        InformationProviderBean bean = (InformationProviderBean) applicationMap.get(InformationProviderBean.BEAN_NAME);

        if (bean == null)
        {
            return initInformationProviderBean(applicationMap);
        }
        return bean;
    }

    private InformationProviderBean initInformationProviderBean(Map applicationMap)
    {
        List<String> informationProviderBeanClassNames = new ArrayList<String>();

        informationProviderBeanClassNames.add(WebXmlParameter.CUSTOM_CONVENTION_INFO_PROVIDER_BEAN);
        informationProviderBeanClassNames.add(getCustomInformationProviderBeanClassName());
        informationProviderBeanClassNames.add(InformationProviderBean.class.getName());

        InformationProviderBean informationProviderBean;
        for (String className : informationProviderBeanClassNames)
        {
            informationProviderBean = (InformationProviderBean) ClassUtils.tryToInstantiateClassForName(className);

            if (informationProviderBean != null)
            {
                applicationMap.put(InformationProviderBean.BEAN_NAME, informationProviderBean);
                return informationProviderBean;
            }
        }
        throw new IllegalStateException(InformationProviderBean.class.getName() + " not found");
    }

    private String getCustomInformationProviderBeanClassName()
    {
        InformationProviderBean bean = (InformationProviderBean) ELUtils.getBean(InformationProviderBean.CUSTOM_BEAN);

        return (bean != null) ? bean.getClass().getName() : null;
    }
}