001/**
002 * Copyright 2013-2015 John Ericksen
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *    http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.asciidoctor.asciidoclet;
017
018import com.google.common.base.Optional;
019import com.google.common.io.ByteSink;
020import com.google.common.io.Files;
021import com.google.common.io.Resources;
022import com.sun.javadoc.DocErrorReporter;
023
024import java.io.File;
025import java.io.IOException;
026import java.net.URL;
027
028/**
029 * Sets up a temporary directory containing output templates for use by Asciidoctor.
030 */
031public class OutputTemplates {
032
033    private static final String[] TEMPLATE_NAMES = new String[] {
034            "section.html.haml",
035            "paragraph.html.haml"
036    };
037
038    private final File templateDir;
039
040    private OutputTemplates(File templateDir) {
041        this.templateDir = templateDir;
042    }
043
044    static Optional<OutputTemplates> create(DocErrorReporter errorReporter) {
045        File dir = prepareTemplateDir(errorReporter);
046        return dir == null ? Optional.<OutputTemplates>absent() : Optional.of(new OutputTemplates(dir));
047    }
048
049    File templateDir() {
050        return templateDir;
051    }
052
053    void delete() {
054        for (String templateName : TEMPLATE_NAMES) {
055            new File(templateDir, templateName).delete();
056        }
057        templateDir.delete();
058    }
059
060    private static File prepareTemplateDir(DocErrorReporter errorReporter) {
061        // copy our template resources to the templateDir so Asciidoctor can use them.
062        File templateDir = Files.createTempDir();
063        try {
064            for (String templateName : TEMPLATE_NAMES) {
065                prepareTemplate(templateDir, templateName);
066            }
067            return templateDir;
068        } catch (IOException e) {
069            errorReporter.printWarning("Failed to prepare templates: " + e.getLocalizedMessage());
070            return null;
071        }
072    }
073
074    private static void prepareTemplate(File templateDir, String template) throws IOException {
075        URL src = OutputTemplates.class.getClassLoader().getResource("templates/" + template);
076        if (src == null) {
077            throw new IOException("Could not find template " + template);
078        }
079        ByteSink dest = Files.asByteSink(new File(templateDir, template));
080        Resources.asByteSource(src).copyTo(dest);
081    }
082
083}