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/*
* The MIT License
*
* Copyright (c) 2009-2023 PrimeTek Informatics
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.primefaces.component.importconstants;
import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.Collections;
import java.util.Map;
import javax.faces.FacesException;
import javax.faces.application.ProjectStage;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.view.facelets.FaceletContext;
import javax.faces.view.facelets.TagAttribute;
import javax.faces.view.facelets.TagConfig;
import javax.faces.view.facelets.TagHandler;
import org.primefaces.context.PrimeApplicationContext;
import org.primefaces.util.LangUtils;
/**
* {@link TagHandler} for the ImportConstants component.
*/
public class ImportConstantsTagHandler extends TagHandler {
private final TagAttribute typeTagAttribute;
private final TagAttribute varTagAttribute;
public ImportConstantsTagHandler(TagConfig config) {
super(config);
typeTagAttribute = super.getRequiredAttribute("type");
varTagAttribute = super.getAttribute("var");
}
@Override
public void apply(FaceletContext ctx, UIComponent parent) throws IOException {
FacesContext facesContext = FacesContext.getCurrentInstance();
Class type = getClassFromAttribute(typeTagAttribute, ctx);
Map constants = getConstants(facesContext, type);
// Create alias/var expression
String var;
if (varTagAttribute == null) {
var = type.getSimpleName(); // fall back to class name
}
else {
var = varTagAttribute.getValue(ctx);
}
ctx.setAttribute(var, constants);
}
/**
* Gets the {@link Class} from the {@link TagAttribute}.
*
* @param attribute The {@link TagAttribute}.
* @param ctx The {@link FaceletContext}.
* @return The {@link Class}.
*/
protected Class getClassFromAttribute(TagAttribute attribute, FaceletContext ctx) {
String type = attribute.getValue(ctx);
try {
return LangUtils.loadClassForName(type);
}
catch (ClassNotFoundException e) {
throw new FacesException("Class " + type + " not found.", e);
}
}
/**
* Get all constants of the given {@link Class}.
*
* @param facesContext The {@link FacesContext}.
* @param type The class which includes the constants.
* @return A {@link Map} with the constants.
*/
protected Map getConstants(FacesContext facesContext, Class type) {
boolean cacheEnabled = facesContext.isProjectStage(ProjectStage.Production);
Map, Map> cache
= PrimeApplicationContext.getCurrentInstance(FacesContext.getCurrentInstance()).getConstantsCacheMap();
Map constants;
if (cacheEnabled && cache.containsKey(type)) {
constants = cache.get(type);
}
else {
constants = Collections.unmodifiableMap(collectConstants(type));
if (cacheEnabled) {
cache.put(type, constants);
}
}
return constants;
}
/**
* Collects all constants of the given {@link Class}.
*
* @param type The class which includes the constants.
* @return A {@link Map} with the found constants.
*/
protected static Map collectConstants(Class type) {
Map constants = new ConstantsHashMap<>(type);
// Go through all the fields, and put static ones in a map.
Field[] fields = type.getFields();
for (Field field : fields) {
// already collected in a class with higher prio
if (constants.containsKey(field.getName())) {
continue;
}
// Check to see if this is public static final. If not, it's not a constant.
int modifiers = field.getModifiers();
if (!Modifier.isFinal(modifiers) || !Modifier.isStatic(modifiers) || !Modifier.isPublic(modifiers)) {
continue;
}
try {
Object value = field.get(null); // null for static fields.
constants.put(field.getName(), value);
}
catch (Exception e) {
throw new FacesException("Could not get value of " + field.getName() + " in " + type.getName() + ".", e);
}
}
return constants;
}
}