org.springframework.boot.groovy.GroovyTemplate Maven / Gradle / Ivy
/*
* Copyright 2012-2018 the original author or authors.
*
* 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 org.springframework.boot.groovy;
import java.io.File;
import java.io.IOException;
import java.io.StringWriter;
import java.net.URL;
import java.util.Collections;
import java.util.Map;
import groovy.lang.Writable;
import groovy.text.GStringTemplateEngine;
import groovy.text.Template;
import groovy.text.TemplateEngine;
import org.codehaus.groovy.control.CompilationFailedException;
/**
* Helpful utilities for working with Groovy {@link Template}s.
*
* @author Dave Syer
*/
public abstract class GroovyTemplate {
public static String template(String name)
throws IOException, CompilationFailedException, ClassNotFoundException {
return template(name, Collections.emptyMap());
}
public static String template(String name, Map model)
throws IOException, CompilationFailedException, ClassNotFoundException {
return template(new GStringTemplateEngine(), name, model);
}
public static String template(TemplateEngine engine, String name,
Map model)
throws IOException, CompilationFailedException, ClassNotFoundException {
Writable writable = getTemplate(engine, name).make(model);
StringWriter result = new StringWriter();
writable.writeTo(result);
return result.toString();
}
private static Template getTemplate(TemplateEngine engine, String name)
throws CompilationFailedException, ClassNotFoundException, IOException {
File file = new File("templates", name);
if (file.exists()) {
return engine.createTemplate(file);
}
ClassLoader classLoader = GroovyTemplate.class.getClassLoader();
URL resource = classLoader.getResource("templates/" + name);
if (resource != null) {
return engine.createTemplate(resource);
}
return engine.createTemplate(name);
}
}