1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/rt/vm/src/main/java/org/apidesign/vm4brwsr/ClassDataCache.java	Mon May 06 18:06:08 2013 +0200
     1.3 @@ -0,0 +1,55 @@
     1.4 +/**
     1.5 + * Back 2 Browser Bytecode Translator
     1.6 + * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
     1.7 + *
     1.8 + * This program is free software: you can redistribute it and/or modify
     1.9 + * it under the terms of the GNU General Public License as published by
    1.10 + * the Free Software Foundation, version 2 of the License.
    1.11 + *
    1.12 + * This program is distributed in the hope that it will be useful,
    1.13 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    1.14 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    1.15 + * GNU General Public License for more details.
    1.16 + *
    1.17 + * You should have received a copy of the GNU General Public License
    1.18 + * along with this program. Look for COPYING file in the top folder.
    1.19 + * If not, see http://opensource.org/licenses/GPL-2.0.
    1.20 + */
    1.21 +package org.apidesign.vm4brwsr;
    1.22 +
    1.23 +import java.io.IOException;
    1.24 +import java.io.InputStream;
    1.25 +import java.util.HashMap;
    1.26 +import java.util.Map;
    1.27 +import org.apidesign.bck2brwsr.core.ExtraJavaScript;
    1.28 +import org.apidesign.vm4brwsr.ByteCodeParser.ClassData;
    1.29 +
    1.30 +@ExtraJavaScript(processByteCode = false, resource="")
    1.31 +final class ClassDataCache {
    1.32 +    private static final Object MISSING_CLASS = new Object();
    1.33 +
    1.34 +    private final Bck2Brwsr.Resources resources;
    1.35 +    private final Map<String, Object> classDataMap;
    1.36 +
    1.37 +    ClassDataCache(final Bck2Brwsr.Resources resources) {
    1.38 +        this.resources = resources;
    1.39 +
    1.40 +        classDataMap = new HashMap<String, Object>();
    1.41 +    }
    1.42 +
    1.43 +    ClassData getClassData(final String className) throws IOException {
    1.44 +        Object cacheEntry = classDataMap.get(className);
    1.45 +        if (cacheEntry == null) {
    1.46 +            final InputStream is = loadClass(resources, className);
    1.47 +            cacheEntry = (is != null) ? new ClassData(is) : MISSING_CLASS;
    1.48 +            classDataMap.put(className, cacheEntry);
    1.49 +        }
    1.50 +
    1.51 +        return (cacheEntry != MISSING_CLASS) ? (ClassData) cacheEntry : null;
    1.52 +    }
    1.53 +
    1.54 +    private static InputStream loadClass(Bck2Brwsr.Resources l, String name)
    1.55 +            throws IOException {
    1.56 +        return l.get(name + ".class"); // NOI18N
    1.57 +    }
    1.58 +}