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GroovyTemplateUtils.java
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GroovyTemplateUtils.java
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/**
* 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.pinot.spi.utils;
import groovy.text.SimpleTemplateEngine;
import java.io.IOException;
import java.time.Instant;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class GroovyTemplateUtils {
private GroovyTemplateUtils() {
}
private static final SimpleTemplateEngine GROOVY_TEMPLATE_ENGINE = new SimpleTemplateEngine();
private static final DateTimeFormatter DATE_FORMAT =
DateTimeFormatter.ofPattern("yyyy-MM-dd").withZone(ZoneOffset.UTC);
public static String renderTemplate(String template, Map<String, Object> newContext)
throws IOException, ClassNotFoundException {
Map<String, Object> contextMap = getDefaultContextMap();
contextMap.putAll(newContext);
return GROOVY_TEMPLATE_ENGINE.createTemplate(template).make(contextMap).toString();
}
/**
Construct default template context:
today : today's date in format `yyyy-MM-dd`, example value: '2020-05-06'
yesterday : yesterday's date in format `yyyy-MM-dd`, example value: '2020-05-06'
*/
public static Map<String, Object> getDefaultContextMap() {
Map<String, Object> defaultContextMap = new HashMap<>();
Instant now = Instant.now();
defaultContextMap.put("today", DATE_FORMAT.format(now));
defaultContextMap.put("yesterday", DATE_FORMAT.format(now.minus(1, ChronoUnit.DAYS)));
return defaultContextMap;
}
public static Map<String, Object> getTemplateContext(List<String> values) {
if (values == null) {
return Collections.emptyMap();
}
Map<String, Object> context = new HashMap<>();
for (String value : values) {
String[] splits = value.split("=", 2);
if (splits.length > 1) {
context.put(splits[0], splits[1]);
}
}
return context;
}
public static String renderTemplate(String template)
throws IOException, ClassNotFoundException {
return renderTemplate(template, Collections.emptyMap());
}
static {
GROOVY_TEMPLATE_ENGINE.setEscapeBackslash(true);
}
}