com.foreach.across.modules.entity.views.ViewElementLookupRegistryImpl Maven / Gradle / Ivy

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/*
 * Copyright 2014 the original author or authors
 *
 * Licensed 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.foreach.across.modules.entity.views;

import com.foreach.across.modules.web.ui.ViewElementBuilder;
import com.foreach.across.modules.web.ui.ViewElementPostProcessor;

import java.util.*;

/**
 * @author Arne Vandamme
 */
public class ViewElementLookupRegistryImpl implements ViewElementLookupRegistry
{
	private final Map viewElementTypes = new HashMap<>();
	private final Map viewElementBuilderCache = new HashMap<>();
	private final Map fixedViewElementBuilders = new HashMap<>();
	private final Map cacheableStatus = new HashMap<>();
	private final Map>> postProcessors = new HashMap<>();

	private boolean defaultCacheable = true;

	public boolean isDefaultCacheable() {
		return defaultCacheable;
	}

	public void setDefaultCacheable( boolean defaultCacheable ) {
		this.defaultCacheable = defaultCacheable;
	}

	@Override
	public void setViewElementBuilder( ViewElementMode mode, ViewElementBuilder builder ) {
		if ( builder != null ) {
			fixedViewElementBuilders.put( mode, builder );
		}
		else {
			fixedViewElementBuilders.remove( mode );
		}
	}

	@Override
	public void addViewElementPostProcessor( ViewElementMode mode, ViewElementPostProcessor postProcessor ) {
		postProcessors.computeIfAbsent( mode, m -> new ArrayList<>() ).add( postProcessor );
	}

	@Override
	public boolean cacheViewElementBuilder( ViewElementMode mode, ViewElementBuilder builder ) {
		if ( isCacheable( mode ) ) {
			viewElementBuilderCache.put( mode, builder );
			return true;
		}

		return false;
	}

	@Override
	public String getViewElementType( ViewElementMode mode ) {
		return viewElementTypes.get( mode );
	}

	@Override
	public void setViewElementType( ViewElementMode mode, String viewElementType ) {
		viewElementTypes.put( mode, viewElementType );
	}

	@Override
	public void setCacheable( ViewElementMode mode, boolean cacheable ) {
		cacheableStatus.put( mode, cacheable );
		if ( !cacheable ) {
			reset( mode );
		}
	}

	@Override
	public void reset( ViewElementMode mode ) {
		viewElementBuilderCache.remove( mode );
	}

	@Override
	public ViewElementBuilder getViewElementBuilder( ViewElementMode mode ) {
		return fixedViewElementBuilders.get( mode );
	}

	@Override
	public ViewElementBuilder getCachedViewElementBuilder( ViewElementMode mode ) {
		return isCacheable( mode ) ? viewElementBuilderCache.get( mode ) : null;
	}

	@Override
	public void clearCache() {
		viewElementBuilderCache.clear();
	}

	@Override
	public Collection> getViewElementPostProcessors( ViewElementMode mode ) {
		return postProcessors.getOrDefault( mode, Collections.emptyList() );
	}

	@Override
	public boolean isCacheable( ViewElementMode mode ) {
		return cacheableStatus.containsKey( mode ) ? Boolean.TRUE.equals( cacheableStatus.get( mode ) ) : defaultCacheable;
	}

	/**
	 * Merge the current values into an already existing registry.
	 * This will clear the entire cache of the target registry.
	 *
	 * @param existing to merge the values in
	 */
	public void mergeInto( ViewElementLookupRegistry existing ) {
		cacheableStatus.forEach( existing::setCacheable );
		viewElementTypes.forEach( existing::setViewElementType );
		fixedViewElementBuilders.forEach( existing::setViewElementBuilder );
		postProcessors.forEach(
				( mode, list ) -> list.forEach( pp -> existing.addViewElementPostProcessor( mode, pp ) )
		);

		existing.clearCache();
	}

	@Override
	@SuppressWarnings("all")
	public ViewElementLookupRegistryImpl clone() {
		ViewElementLookupRegistryImpl clone = new ViewElementLookupRegistryImpl();
		clone.cacheableStatus.putAll( this.cacheableStatus );
		clone.viewElementTypes.putAll( this.viewElementTypes );
		clone.fixedViewElementBuilders.putAll( this.fixedViewElementBuilders );
		clone.postProcessors.putAll( this.postProcessors );
		clone.defaultCacheable = this.defaultCacheable;
		return clone;
	}
}