gwen.eval.support.JsonPathSupport.scala Maven / Gradle / Ivy

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A Given-When-Then interpreter and automation platform

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/*
 * Copyright 2016 Branko Juric, Brady Wood
 * 
 * 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 gwen.eval.support

import gwen.errors._
import com.jayway.jsonpath.JsonPath
import com.jayway.jsonpath.Configuration
import com.jayway.jsonpath.PathNotFoundException

/** Can be mixed into evaluation engines to provide Json path support. */
trait JsonPathSupport {

  /**
    * Evaluates an json path expression against a JSON source string and returns 
    * the result.
    * 
    * @param jsonpath the json path expression
    * @param source the json source string
    * @return the result of evaluating the json path expression
    */
  def evaluateJsonPath(jsonpath: String, source: String): String = {
    if (source.trim().length() == 0) {
      jsonPathError("Cannot evaluate Json path on empty source")
    }
    try {
      println(JsonPath.parse(source).read(jsonpath))
      JsonPath.parse(source).read(jsonpath).toString
    } catch {
      case e: PathNotFoundException => ""
    }
  }

}