io.soabase.web.assets.WebZipTemplateLoader Maven / Gradle / Ivy

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/**
 * Copyright 2016 Jordan Zimmerman
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.soabase.web.assets;

import com.github.jknack.handlebars.io.TemplateSource;
import com.github.jknack.handlebars.io.URLTemplateLoader;
import com.google.common.collect.Maps;
import io.soabase.web.config.WebConfiguration;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.concurrent.ConcurrentMap;

class WebZipTemplateLoader extends URLTemplateLoader implements WebTemplateLoader
{
    private final WebConfiguration configuration;
    private final ConcurrentMap sourceCache = Maps.newConcurrentMap();
    private final URLClassLoader classLoader;

    WebZipTemplateLoader(WebConfiguration configuration, File zipFile)
    {
        this.configuration = configuration;
        URLClassLoader classLoader;
        try
        {
            classLoader = new URLClassLoader(new URL[]{zipFile.toURI().toURL()});
        }
        catch ( MalformedURLException e )
        {
            throw new RuntimeException(e);
        }
        this.classLoader = classLoader;

        setSuffix("");
        setPrefix("");
    }

    @Override
    public URL getResourceUrl(String absoluteRequestedResourcePath)
    {
        try
        {
            return getResource(absoluteRequestedResourcePath);
        }
        catch ( IOException e )
        {
            throw new RuntimeException(e);
        }
    }

    @Override
    protected URL getResource(String location) throws IOException
    {
        if ( location.startsWith("/") )
        {
            location = (location.length() > 1) ? location.substring(1) : "";
        }
        return classLoader.getResource(location);
    }

    @Override
    public TemplateSource sourceAt(String uri) throws IOException
    {
        if ( configuration.debug )
        {
            return super.sourceAt(uri);
        }
        return sourceCache.computeIfAbsent(uri, this::getTemplateSource);
    }

    private TemplateSource getTemplateSource(String key)
    {
        try
        {
            return super.sourceAt(key);
        }
        catch ( IOException e )
        {
            throw new RuntimeException(e);
        }
    }
}