io.wcm.devops.conga.tooling.maven.plugin.validation.TemplateValidator.java Source code

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Here is the source code for io.wcm.devops.conga.tooling.maven.plugin.validation.TemplateValidator.java

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/*
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 * wcm.io
 * %%
 * Copyright (C) 2015 wcm.io
 * %%
 * 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.
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package io.wcm.devops.conga.tooling.maven.plugin.validation;

import org.apache.commons.lang3.CharEncoding;
import org.apache.commons.lang3.StringUtils;
import org.apache.maven.plugin.MojoFailureException;

import com.github.jknack.handlebars.Handlebars;

import io.wcm.devops.conga.generator.handlebars.HandlebarsManager;
import io.wcm.devops.conga.generator.plugins.handlebars.escaping.NoneEscapingStrategy;
import io.wcm.devops.conga.resource.Resource;
import io.wcm.devops.conga.resource.ResourceCollection;
import io.wcm.devops.conga.tooling.maven.plugin.util.PathUtil;

/**
 * Validates Handlebars templates by compiling it.
 */
public final class TemplateValidator implements DefinitionValidator {

    private static final String FILE_EXTENSION = "hbs";

    private final ResourceCollection templateDir;
    private final HandlebarsManager handlebarsManager;

    /**
     * @param templateDir Template directory
     * @param handlebarsManager Handlebars Manager
     */
    public TemplateValidator(ResourceCollection templateDir, HandlebarsManager handlebarsManager) {
        this.templateDir = templateDir;
        this.handlebarsManager = handlebarsManager;
    }

    @Override
    public void validate(Resource resource, String pathForLog) throws MojoFailureException {
        if (StringUtils.equalsIgnoreCase(resource.getFileExtension(), FILE_EXTENSION)) {
            String templatePath = StringUtils.substringAfter(PathUtil.unifySlashes(resource.getCanonicalPath()),
                    PathUtil.unifySlashes(templateDir.getCanonicalPath()) + "/");
            Handlebars handlebars = handlebarsManager.get(NoneEscapingStrategy.NAME, CharEncoding.UTF_8);
            try {
                handlebars.compile(templatePath);
            } catch (Throwable ex) {
                throw new MojoFailureException("Template " + pathForLog + " is invalid:\n" + ex.getMessage());
            }
        }
    }

}