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/*
 * Licensed to Laurent Broudoux (the "Author") under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Author 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 io.github.microcks.util.soapui;

import io.github.microcks.util.WritableNamespaceContext;

import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;

/**
 * Builder from creating XPathExpression matcher from SoapUI rules.
 * @author laurent
 */
public class SoapUIXPathBuilder {

   /**
    * Build a XPath expressions matcher from SoapUI Rules.
    * @param rules The string representing the rules.
    * @return An XPathExpression following the given rules
    * @throws XPathExpressionException if something wrong occurs.
    */
   public static XPathExpression buildXPathMatcherFromRules(String rules) throws XPathExpressionException {
      XPath xpath = XPathFactory.newInstance().newXPath();
      WritableNamespaceContext nsContext = new WritableNamespaceContext();

      // Parse SoapUI rules for getting namespaces and expression to evaluate.
      // declare namespace ser='http://www.example.com/test/service';
      // //ser:sayHello/name
      String xpathExpression = null;
      String lines[] = rules.split("\\r?\\n");
      for (String line : lines){
         line = line.trim();
         if (line.startsWith("declare namespace ")){
            String prefix = line.substring(18, line.indexOf("="));
            String namespace = line.substring(line.indexOf("=") + 2, line.lastIndexOf("'"));
            nsContext.addNamespaceURI(prefix, namespace);
         }
         else if (line.startsWith("/")){
            xpathExpression = line;
         }
      }

      // Set namespace context and compile expression.
      xpath.setNamespaceContext(nsContext);
      return xpath.compile(xpathExpression);
   }
}