| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.freemarker.generator.cli.task; |
| |
| import freemarker.template.Configuration; |
| import freemarker.template.Template; |
| import freemarker.template.TemplateException; |
| import org.apache.commons.io.FileUtils; |
| import org.apache.freemarker.generator.base.datasource.DataSource; |
| import org.apache.freemarker.generator.base.datasource.DataSources; |
| import org.apache.freemarker.generator.base.output.OutputGenerator; |
| import org.apache.freemarker.generator.base.template.TemplateOutput; |
| import org.apache.freemarker.generator.base.template.TemplateSource; |
| |
| import java.io.BufferedWriter; |
| import java.io.File; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStreamWriter; |
| import java.io.Writer; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.concurrent.Callable; |
| import java.util.function.Supplier; |
| import java.util.stream.Collectors; |
| import java.util.stream.Stream; |
| |
| import static java.util.Objects.requireNonNull; |
| import static org.apache.freemarker.generator.base.FreeMarkerConstants.Model; |
| |
| /** |
| * Renders a FreeMarker template. |
| */ |
| public class FreeMarkerTask implements Callable<Integer> { |
| |
| private static final int SUCCESS = 0; |
| |
| private final Supplier<Configuration> configurationSupplier; |
| private final Supplier<List<OutputGenerator>> outputGeneratorsSupplier; |
| private final Supplier<Map<String, Object>> sharedDataModelSupplier; |
| private final Supplier<List<DataSource>> sharedDataSourcesSupplier; |
| private final Supplier<Map<String, Object>> sharedParametersSupplier; |
| |
| public FreeMarkerTask(Supplier<Configuration> configurationSupplier, |
| Supplier<List<OutputGenerator>> outputGeneratorsSupplier, |
| Supplier<Map<String, Object>> sharedDataModelSupplier, |
| Supplier<List<DataSource>> sharedDataSourcesSupplier, |
| Supplier<Map<String, Object>> sharedParametersSupplier) { |
| this.configurationSupplier = requireNonNull(configurationSupplier, "configurationSupplier"); |
| this.outputGeneratorsSupplier = requireNonNull(outputGeneratorsSupplier, "outputGeneratorsSupplier"); |
| this.sharedDataModelSupplier = requireNonNull(sharedDataModelSupplier, "sharedDataModelSupplier"); |
| this.sharedDataSourcesSupplier = requireNonNull(sharedDataSourcesSupplier, "sharedDataSourcesSupplier"); |
| this.sharedParametersSupplier = requireNonNull(sharedParametersSupplier, "parametersSupplier"); |
| } |
| |
| @Override |
| public Integer call() { |
| final Configuration configuration = configurationSupplier.get(); |
| final List<OutputGenerator> outputGenerators = outputGeneratorsSupplier.get(); |
| final Map<String, Object> sharedDataModel = sharedDataModelSupplier.get(); |
| final List<DataSource> sharedDataSources = sharedDataSourcesSupplier.get(); |
| final Map<String, Object> sharedParameters = sharedParametersSupplier.get(); |
| |
| outputGenerators.forEach(outputGenerator -> process( |
| configuration, |
| outputGenerator, |
| sharedDataModel, |
| sharedDataSources, |
| sharedParameters)); |
| |
| return SUCCESS; |
| } |
| |
| private void process(Configuration configuration, |
| OutputGenerator outputGenerator, |
| Map<String, Object> sharedDataModelMap, |
| List<DataSource> sharedDataSources, |
| Map<String, Object> sharedParameters) { |
| final TemplateSource templateSource = outputGenerator.getTemplateSource(); |
| final TemplateOutput templateOutput = outputGenerator.getTemplateOutput(); |
| final DataSources dataSources = toDataSources(outputGenerator, sharedDataSources); |
| final Map<String, Object> variables = outputGenerator.getVariables(); |
| final Map<String, Object> templateDataModel = toTemplateDataModel(dataSources, variables, sharedDataModelMap, sharedParameters); |
| |
| try (Writer writer = writer(templateOutput)) { |
| final Template template = template(configuration, templateSource); |
| template.process(templateDataModel, writer); |
| } catch (TemplateException | IOException e) { |
| throw new RuntimeException("Failed to process template: " + templateSource.getName(), e); |
| } |
| } |
| |
| private static DataSources toDataSources(OutputGenerator outputGenerator, List<DataSource> sharedDataSources) { |
| return new DataSources(Stream.of(outputGenerator.getDataSources(), sharedDataSources) |
| .flatMap(Collection::stream).collect(Collectors.toList())); |
| } |
| |
| @SafeVarargs |
| private static Map<String, Object> toTemplateDataModel(DataSources dataSources, Map<String, Object>... maps) { |
| final Map<String, Object> result = new HashMap<>(); |
| Arrays.stream(maps).forEach(result::putAll); |
| result.put(Model.DATASOURCES, dataSources); |
| return result; |
| } |
| |
| private static Writer writer(TemplateOutput templateOutput) throws IOException { |
| if (templateOutput.hasWriter()) { |
| return templateOutput.getWriter(); |
| } else { |
| final File file = templateOutput.getFile(); |
| FileUtils.forceMkdirParent(file); |
| // We need to explicitly set our output encoding here - see https://freemarker.apache.org/docs/pgui_misc_charset.html |
| return new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file), templateOutput.getCharset())); |
| } |
| } |
| |
| /** |
| * Loading FreeMarker templates from absolute paths is not encouraged due to security |
| * concern (see https://freemarker.apache.org/docs/pgui_config_templateloading.html#autoid_42) |
| * which are mostly irrelevant when running on the command line. So we resolve the absolute file |
| * instead of relying on existing template loaders. |
| * |
| * @param configuration FreeMarker configuration |
| * @param templateSource source template to load |
| * @return FreeMarker template |
| */ |
| private static Template template(Configuration configuration, TemplateSource templateSource) { |
| switch (templateSource.getOrigin()) { |
| case TEMPLATE_LOADER: |
| return fromTemplatePath(configuration, templateSource); |
| case TEMPLATE_CODE: |
| return fromTemplateCode(configuration, templateSource); |
| default: |
| throw new IllegalArgumentException("Don't know how to create a template: " + templateSource.getOrigin()); |
| } |
| } |
| |
| private static Template fromTemplatePath(Configuration configuration, TemplateSource templateSource) { |
| final String path = templateSource.getPath(); |
| try { |
| return configuration.getTemplate(path); |
| } catch (IOException e) { |
| throw new RuntimeException("Failed to load template from path: " + path, e); |
| } |
| } |
| |
| private static Template fromTemplateCode(Configuration configuration, TemplateSource templateSource) { |
| final String name = templateSource.getName(); |
| try { |
| return new Template(name, templateSource.getCode(), configuration); |
| } catch (IOException e) { |
| throw new RuntimeException("Failed to load template code: " + name, e); |
| } |
| } |
| } |