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Modern server-side Java template engine for both web and standalone environments

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/*
 * =============================================================================
 * 
 *   Copyright (c) 2011-2016, The THYMELEAF team (http://www.thymeleaf.org)
 * 
 *   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 org.thymeleaf.expression;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import org.thymeleaf.context.IExpressionContext;
import org.thymeleaf.util.Validate;


/**
 * 

* Base abstract class for {@link IExpressionObjects} implementations. *

* * @author Daniel Fernández * * @since 3.0.0 * */ public class ExpressionObjects implements IExpressionObjects { /* * Making room for 3 expression objects should be enough for most cases, given these maps will be * created for each IProcessingContext (i.e. for each template processing request) */ private static final int EXPRESSION_OBJECT_MAP_DEFAULT_SIZE = 3; private final IExpressionContext context; private final IExpressionObjectFactory expressionObjectFactory; private final Set expressionObjectNames; private Map objects; public ExpressionObjects( final IExpressionContext context, final IExpressionObjectFactory expressionObjectFactory) { super(); Validate.notNull(context, "Context cannot be null"); Validate.notNull(expressionObjectFactory, "Expression Object Factory cannot be null"); this.context = context; this.expressionObjectFactory = expressionObjectFactory; this.expressionObjectNames = this.expressionObjectFactory.getAllExpressionObjectNames(); } public int size() { return this.expressionObjectNames.size(); } public boolean containsObject(final String name) { return this.expressionObjectNames.contains(name); } public Set getObjectNames() { return this.expressionObjectNames; } public Object getObject(final String name) { /* * First, a quick attempt to resolve from the object cache */ if (this.objects != null && this.objects.containsKey(name)) { return this.objects.get(name); } /* * If the object is not provided by the factory, simply return null */ if (!this.expressionObjectNames.contains(name)) { return null; } /* * Have the factory build the object */ final Object object = this.expressionObjectFactory.buildObject(this.context, name); /* * If the object is not cacheable, we will just return it */ if (!this.expressionObjectFactory.isCacheable(name)) { return object; } /* * The object is cacheable, so we will need to use the objects map in order to perform such caching, and * first of all we must ensure it (the cache) exists */ if (this.objects == null) { this.objects = new HashMap(EXPRESSION_OBJECT_MAP_DEFAULT_SIZE); } /* * Put into cache and return */ this.objects.put(name, object); return object; } }




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