com.liferay.faces.alloy.reslib.application.internal.ExpressionUtil Maven / Gradle / Ivy
/**
* Copyright (c) 2000-2022 Liferay, Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 2.1 of the License, or (at your option)
* any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*/
package com.liferay.faces.alloy.reslib.application.internal;
import javax.faces.application.Resource;
import javax.faces.application.ResourceHandler;
import javax.faces.context.ExternalContext;
/**
* @author Kyle Stiemann
*/
/* package-private */ class ExpressionUtil {
// Private Constants
private static final String RESOURCE_TOKEN_BEGIN = "#{resource['";
private static final String RESOURCE_TOKEN_END = "']}";
// Prevent instantiation since this is a static utility class.
private ExpressionUtil() {
throw new AssertionError();
}
/* package-priavte */ static String filterResourceExpressions(String text, ResourceHandler resourceHandlerChain,
ExternalContext externalContext) {
int startPos = text.indexOf(RESOURCE_TOKEN_BEGIN);
while (startPos > 0) {
int finishPos = text.indexOf(RESOURCE_TOKEN_END, startPos);
if (finishPos > 0) {
String resourcePair = text.substring(startPos + RESOURCE_TOKEN_BEGIN.length(), finishPos);
if (resourcePair.indexOf(":") > 0) {
String[] resourceTokens = resourcePair.split(":");
String libraryName = resourceTokens[0];
String resourceName = resourceTokens[1];
Resource resource = resourceHandlerChain.createResource(resourceName, libraryName);
if (resource != null) {
String requestPath = resource.getRequestPath();
if (requestPath != null) {
String resourceURL = externalContext.encodeResourceURL(requestPath);
text = text.substring(0, startPos) + resourceURL +
text.substring(finishPos + RESOURCE_TOKEN_END.length());
}
}
}
}
startPos = text.indexOf(RESOURCE_TOKEN_BEGIN);
}
return text;
}
}