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/*
* 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.struts2.tiles;
import com.opensymphony.xwork2.util.TextParseUtil;
import ognl.OgnlException;
import ognl.OgnlRuntime;
import ognl.PropertyAccessor;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.tiles.TilesContainer;
import org.apache.tiles.definition.DefinitionsFactory;
import org.apache.tiles.definition.pattern.DefinitionPatternMatcherFactory;
import org.apache.tiles.definition.pattern.PatternDefinitionResolver;
import org.apache.tiles.definition.pattern.PrefixedPatternDefinitionResolver;
import org.apache.tiles.definition.pattern.regexp.RegexpDefinitionPatternMatcherFactory;
import org.apache.tiles.definition.pattern.wildcard.WildcardDefinitionPatternMatcherFactory;
import org.apache.tiles.el.ELAttributeEvaluator;
import org.apache.tiles.el.JspExpressionFactoryFactory;
import org.apache.tiles.el.ScopeELResolver;
import org.apache.tiles.el.TilesContextBeanELResolver;
import org.apache.tiles.el.TilesContextELResolver;
import org.apache.tiles.evaluator.AttributeEvaluatorFactory;
import org.apache.tiles.evaluator.BasicAttributeEvaluatorFactory;
import org.apache.tiles.evaluator.impl.DirectAttributeEvaluator;
import org.apache.tiles.factory.BasicTilesContainerFactory;
import org.apache.tiles.factory.TilesContainerFactoryException;
import org.apache.tiles.impl.mgmt.CachingTilesContainer;
import org.apache.tiles.locale.LocaleResolver;
import org.apache.tiles.ognl.AnyScopePropertyAccessor;
import org.apache.tiles.ognl.DelegatePropertyAccessor;
import org.apache.tiles.ognl.NestedObjectDelegatePropertyAccessor;
import org.apache.tiles.ognl.OGNLAttributeEvaluator;
import org.apache.tiles.ognl.PropertyAccessorDelegateFactory;
import org.apache.tiles.ognl.ScopePropertyAccessor;
import org.apache.tiles.ognl.TilesApplicationContextNestedObjectExtractor;
import org.apache.tiles.ognl.TilesContextPropertyAccessorDelegateFactory;
import org.apache.tiles.preparer.factory.PreparerFactory;
import org.apache.tiles.request.ApplicationContext;
import org.apache.tiles.request.ApplicationResource;
import org.apache.tiles.request.Request;
import org.apache.tiles.request.render.BasicRendererFactory;
import org.apache.tiles.request.render.ChainedDelegateRenderer;
import org.apache.tiles.request.render.Renderer;
import javax.el.ArrayELResolver;
import javax.el.BeanELResolver;
import javax.el.CompositeELResolver;
import javax.el.ELResolver;
import javax.el.ListELResolver;
import javax.el.MapELResolver;
import javax.el.ResourceBundleELResolver;
import javax.servlet.jsp.JspFactory;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
/**
* Dedicated Struts factory to build Tiles container with support for:
* - Freemarker
* - I18N using Struts resource bundles
* - S2 ro access Struts' ValueStack
* - OGNL
* - EL
*
* If you need additional features create your own listener and factory,
* you can base on code from Tiles' CompleteAutoloadTilesContainerFactory
*/
public class StrutsTilesContainerFactory extends BasicTilesContainerFactory {
private static final Logger LOG = LogManager.getLogger(StrutsTilesContainerFactory.class);
/**
* The freemarker renderer name.
*/
public static final String FREEMARKER_RENDERER_NAME = "freemarker";
/**
* Supported pattern types
*/
public static final String PATTERN_WILDCARD = "WILDCARD";
public static final String PATTERN_REGEXP = "REGEXP";
/**
* Default pattern to be used to collect Tiles definitions if user didn't configure any
*/
public static final String TILES_DEFAULT_PATTERN = "tiles*.xml";
/**
* Supported expression languages
*/
public static final String OGNL = "OGNL";
public static final String EL = "EL";
public static final String S2 = "S2";
public static final String I18N = "I18N";
@Override
public TilesContainer createDecoratedContainer(TilesContainer originalContainer, ApplicationContext applicationContext) {
return new CachingTilesContainer(originalContainer);
}
@Override
protected void registerAttributeRenderers(
final BasicRendererFactory rendererFactory,
final ApplicationContext applicationContext,
final TilesContainer container,
final AttributeEvaluatorFactory attributeEvaluatorFactory) {
super.registerAttributeRenderers(rendererFactory, applicationContext, container, attributeEvaluatorFactory);
StrutsFreeMarkerAttributeRenderer freemarkerRenderer = new StrutsFreeMarkerAttributeRenderer();
rendererFactory.registerRenderer(FREEMARKER_RENDERER_NAME, freemarkerRenderer);
}
@Override
protected Renderer createDefaultAttributeRenderer(
BasicRendererFactory rendererFactory,
ApplicationContext applicationContext,
TilesContainer container,
AttributeEvaluatorFactory attributeEvaluatorFactory) {
ChainedDelegateRenderer retValue = new ChainedDelegateRenderer();
retValue.addAttributeRenderer(rendererFactory.getRenderer(DEFINITION_RENDERER_NAME));
retValue.addAttributeRenderer(rendererFactory.getRenderer(FREEMARKER_RENDERER_NAME));
retValue.addAttributeRenderer(rendererFactory.getRenderer(TEMPLATE_RENDERER_NAME));
retValue.addAttributeRenderer(rendererFactory.getRenderer(STRING_RENDERER_NAME));
return retValue;
}
@Override
protected AttributeEvaluatorFactory createAttributeEvaluatorFactory(
ApplicationContext applicationContext,
LocaleResolver resolver) {
BasicAttributeEvaluatorFactory attributeEvaluatorFactory = new BasicAttributeEvaluatorFactory(new DirectAttributeEvaluator());
attributeEvaluatorFactory.registerAttributeEvaluator(S2, createStrutsEvaluator());
attributeEvaluatorFactory.registerAttributeEvaluator(I18N, createI18NEvaluator());
attributeEvaluatorFactory.registerAttributeEvaluator(OGNL, createOGNLEvaluator());
ELAttributeEvaluator elEvaluator = createELEvaluator(applicationContext);
if (elEvaluator != null) {
attributeEvaluatorFactory.registerAttributeEvaluator(EL, elEvaluator);
}
return attributeEvaluatorFactory;
}
@Override
protected PatternDefinitionResolver createPatternDefinitionResolver(Class customizationKeyClass) {
DefinitionPatternMatcherFactory wildcardFactory = new WildcardDefinitionPatternMatcherFactory();
DefinitionPatternMatcherFactory regexpFactory = new RegexpDefinitionPatternMatcherFactory();
PrefixedPatternDefinitionResolver resolver = new PrefixedPatternDefinitionResolver<>();
resolver.registerDefinitionPatternMatcherFactory(PATTERN_WILDCARD, wildcardFactory);
resolver.registerDefinitionPatternMatcherFactory(PATTERN_REGEXP, regexpFactory);
return resolver;
}
protected LocaleResolver createLocaleResolver(ApplicationContext applicationContext) {
return new StrutsTilesLocaleResolver();
}
@Override
protected List getSources(ApplicationContext applicationContext) {
Collection resources = new ArrayList<>();
Set definitions = getTilesDefinitions(applicationContext.getInitParams());
for (String definition : definitions) {
resources.addAll(applicationContext.getResources(definition));
}
if (resources.contains(null)) {
LOG.warn("Some resources were not found. Definitions: {}. Found resources: {}", definitions, resources);
}
List filteredResources = new ArrayList<>();
for (ApplicationResource resource : resources) {
if (resource != null && Locale.ROOT.equals(resource.getLocale())) {
filteredResources.add(resource);
}
}
return filteredResources;
}
@Override
protected PreparerFactory createPreparerFactory(ApplicationContext applicationContext) {
return new StrutsPreparerFactory();
}
protected Set getTilesDefinitions(Map params) {
if (params.containsKey(DefinitionsFactory.DEFINITIONS_CONFIG)) {
return TextParseUtil.commaDelimitedStringToSet(params.get(DefinitionsFactory.DEFINITIONS_CONFIG));
}
return TextParseUtil.commaDelimitedStringToSet(TILES_DEFAULT_PATTERN);
}
protected ELAttributeEvaluator createELEvaluator(ApplicationContext applicationContext) {
if (JspFactory.getDefaultFactory() == null) {
LOG.warn("JspFactory.getDefaultFactory returned null, EL support will be disabled");
return null;
}
ELAttributeEvaluator evaluator = new ELAttributeEvaluator();
JspExpressionFactoryFactory efFactory = new JspExpressionFactoryFactory();
efFactory.setApplicationContext(applicationContext);
evaluator.setExpressionFactory(efFactory.getExpressionFactory());
ELResolver elResolver = new CompositeELResolver() {
{
BeanELResolver beanElResolver = new BeanELResolver(false);
add(new ScopeELResolver());
add(new TilesContextELResolver(beanElResolver));
add(new TilesContextBeanELResolver());
add(new ArrayELResolver(false));
add(new ListELResolver(false));
add(new MapELResolver(false));
add(new ResourceBundleELResolver());
add(beanElResolver);
}
};
evaluator.setResolver(elResolver);
return evaluator;
}
protected StrutsAttributeEvaluator createStrutsEvaluator() {
return new StrutsAttributeEvaluator();
}
protected I18NAttributeEvaluator createI18NEvaluator() {
return new I18NAttributeEvaluator();
}
protected OGNLAttributeEvaluator createOGNLEvaluator() {
try {
PropertyAccessor objectPropertyAccessor = OgnlRuntime.getPropertyAccessor(Object.class);
PropertyAccessor applicationContextPropertyAccessor = new NestedObjectDelegatePropertyAccessor<>(
new TilesApplicationContextNestedObjectExtractor(), objectPropertyAccessor);
PropertyAccessor anyScopePropertyAccessor = new AnyScopePropertyAccessor();
PropertyAccessor scopePropertyAccessor = new ScopePropertyAccessor();
PropertyAccessorDelegateFactory factory = new TilesContextPropertyAccessorDelegateFactory(
objectPropertyAccessor, applicationContextPropertyAccessor, anyScopePropertyAccessor,
scopePropertyAccessor);
PropertyAccessor tilesRequestAccessor = new DelegatePropertyAccessor<>(factory);
OgnlRuntime.setPropertyAccessor(Request.class, tilesRequestAccessor);
return new OGNLAttributeEvaluator();
} catch (OgnlException e) {
throw new TilesContainerFactoryException("Cannot initialize OGNL evaluator", e);
}
}
}
