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org.nuiton.eugene.FasterCachedResourceResolver Maven / Gradle / Ivy

package org.nuiton.eugene;

/*-
 * #%L
 * EUGene :: EUGene Core
 * %%
 * Copyright (C) 2004 - 2017 Code Lutin, Ultreia.io
 * %%
 * This program 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 3 of the
 * License, or (at your option) any later version.
 * 
 * This program 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 General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import io.ultreia.java4all.lang.Strings;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;
import java.net.URL;

/**
 * FasterCachedResourceResolver is a URIResolver using a optimized search time algorithm.
 * 

* For a given href, will try to search the exact path in classp-ath in the exact directory META-INF/cache. *

* The fact of using META-INF directory is optimized (special jvm directory). * * The other fact of using an exact directory makes also decrease dramaticly time search. * * Finally, we spend ten times less time in searching; moreover using the path of * searched resource resolve the probleme of name colision and this is also a good thing... * * Exemple : *
 * href = http://foo/bar/file.txt
 * search resource : /META-INF/cache/foo/bar/file.txt
 * 
* * @author chorlet */ public class FasterCachedResourceResolver extends ResourceResolver { /** log. */ private static final Log log = LogFactory.getLog(FasterCachedResourceResolver.class); protected boolean offline; public FasterCachedResourceResolver() { this(null); } public FasterCachedResourceResolver(String base) { super(base); } public void setOffline(boolean offline) { this.offline = offline; } @Override protected Source findHrefSource(String path) { long t0 = System.nanoTime(); String resource = "META-INF/cache/" + path; if (verbose) { log.info("will discover " + resource); } URL url = cl.getResource(resource); Source source = null; if (url != null) { if (verbose) { log.info(url.toString()); } source = new StreamSource(url.toString()); } if (source == null) { if (offline) { throw new IllegalStateException("offline - could not find extact resource at location " + resource); } log.warn("could not find extact resource at location " + resource); } if (verbose) { log.info("resolved in " + Strings.convertTime(System.nanoTime() - t0)); } return source; } }




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