001/*
002 * (C) Copyright 2015 Nuxeo SA (http://nuxeo.com/) and contributors.
003 *
004 * All rights reserved. This program and the accompanying materials
005 * are made available under the terms of the GNU Lesser General Public License
006 * (LGPL) version 2.1 which accompanies this distribution, and is available at
007 * http://www.gnu.org/licenses/lgpl-2.1.html
008 *
009 * This library is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * Contributors:
015 *     <a href="mailto:grenard@nuxeo.com">Guillaume Renard</a>
016 *
017 */
018
019package org.nuxeo.ecm.web.resources.wro.processor;
020
021import java.io.IOException;
022import java.io.Reader;
023import java.io.Writer;
024import java.util.Map;
025
026import org.apache.commons.lang.StringUtils;
027import org.nuxeo.common.utils.URIUtils;
028import org.nuxeo.ecm.web.resources.wro.provider.NuxeoUriLocator;
029
030import ro.isdc.wro.config.Context;
031import ro.isdc.wro.config.ReadOnlyContext;
032import ro.isdc.wro.config.jmx.WroConfiguration;
033import ro.isdc.wro.model.group.Inject;
034import ro.isdc.wro.model.resource.Resource;
035import ro.isdc.wro.model.resource.processor.ResourcePreProcessor;
036
037/**
038 *
039 * Extends this class to implement a flavor-based processor.
040 *
041 * @since 7.4
042 */
043public abstract class AbstractFlavorProcessor implements ResourcePreProcessor {
044
045    @Inject
046    protected ReadOnlyContext context;
047
048    public abstract String getAlias();
049
050    @Override
051    public void process(Resource resource, Reader reader, Writer writer) throws IOException {
052        String flavor = getFlavor();
053        if (!StringUtils.isBlank(flavor) && isEnabled(resource)) {
054            process(resource, reader, writer, flavor);
055        } else {
056            process(resource, reader, writer, null);
057        }
058    }
059
060    protected abstract void process(final Resource resource, final Reader reader, final Writer writer,
061            String flavorName) throws IOException;
062
063    public String getEncoding() {
064        return Context.isContextSet() ? context.getConfig().getEncoding() : WroConfiguration.DEFAULT_ENCODING;
065    }
066
067    protected String getFlavor() {
068        String queryString = context.getRequest().getQueryString();
069        if (queryString != null) {
070            Map<String, String> params = URIUtils.getRequestParameters(queryString);
071            if (params != null && params.containsKey("flavor")) {
072                return params.get("flavor");
073            }
074        }
075        return null;
076    }
077
078    protected boolean isEnabled(final Resource resource) {
079        return NuxeoUriLocator.isProcessorEnabled(getAlias(), resource.getUri());
080    }
081}