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/*
* Copyright © 2017-2018 AT&T Intellectual Property.
*
* 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.onap.ccsdk.apps.controllerblueprints.core.service
import com.fasterxml.jackson.core.io.CharTypes
import com.fasterxml.jackson.databind.JsonNode
import com.fasterxml.jackson.databind.ObjectMapper
import com.fasterxml.jackson.databind.node.JsonNodeFactory
import com.fasterxml.jackson.databind.node.TextNode
import org.apache.commons.lang3.BooleanUtils
import org.apache.commons.lang3.StringUtils
import org.apache.velocity.VelocityContext
import org.apache.velocity.app.Velocity
import org.onap.ccsdk.apps.controllerblueprints.core.BluePrintProcessorException
import org.onap.ccsdk.apps.controllerblueprints.core.utils.JacksonUtils
import java.io.StringWriter
open class BluePrintTemplateService {
companion object {
/**
* Generate Content from Velocity Template and JSON Content or property map.
*/
fun generateContent(template: String, json: String = "",
ignoreJsonNull: Boolean = false,
additionalContext: Map<String, Any> = hashMapOf()): String {
Velocity.init()
val mapper = ObjectMapper()
val nodeFactory = BluePrintJsonNodeFactory()
mapper.nodeFactory = nodeFactory
val velocityContext = VelocityContext()
velocityContext.put("StringUtils", StringUtils::class.java)
velocityContext.put("BooleanUtils", BooleanUtils::class.java)
// Add the Custom Velocity Context API
additionalContext.forEach { name, value -> velocityContext.put(name, value) }
// Add the JSON Data to the context
if (json.isNotEmpty()) {
val jsonNode = mapper.readValue<JsonNode>(json, JsonNode::class.java)
?: throw BluePrintProcessorException("couldn't get json node from json")
if (ignoreJsonNull)
JacksonUtils.removeJsonNullNode(jsonNode)
jsonNode.fields().forEach { entry ->
velocityContext.put(entry.key, entry.value)
}
}
val stringWriter = StringWriter()
Velocity.evaluate(velocityContext, stringWriter, "TemplateData", template)
stringWriter.flush()
return stringWriter.toString()
}
}
}
/**
* Customise JsonNodeFactory adn TextNode, Since it introduces quotes for string data.
*/
open class BluePrintJsonNodeFactory : JsonNodeFactory() {
override fun textNode(text: String): TextNode {
return BluePrintTextNode(text)
}
}
open class BluePrintTextNode(v: String) : TextNode(v) {
override fun toString(): String {
var len = this._value.length
len = len + 2 + (len shr 4)
val sb = StringBuilder(len)
CharTypes.appendQuoted(sb, this._value)
return sb.toString()
}
}
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