content: /*
   * 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.camel.quarkus.component.saxon.it;
  
  import net.sf.saxon.expr.XPathContext;
  import net.sf.saxon.lib.ExtensionFunctionCall;
  import net.sf.saxon.lib.ExtensionFunctionDefinition;
  import net.sf.saxon.om.Item;
  import net.sf.saxon.om.Sequence;
  import net.sf.saxon.om.StructuredQName;
  import net.sf.saxon.trans.XPathException;
  import net.sf.saxon.value.SequenceType;
  import net.sf.saxon.value.StringValue;
  
  /**
   * This is a very simple example of a saxon extension function.
   * <p/>
   * Example: <code>efx:simple('some text')</code> will be rendered to
   * <code>arg1[some text]</code> and returned in the XQuery response.
   */
  public final class SimpleExtension extends ExtensionFunctionDefinition {
  
      private static final long serialVersionUID = 1L;
  
      @Override
      public SequenceType[] getArgumentTypes() {
          return new SequenceType[] { SequenceType.SINGLE_STRING };
      }
  
      @Override
      public SequenceType getResultType(SequenceType[] suppliedArgumentTypes) {
          return SequenceType.SINGLE_STRING;
      }
  
      @Override
      public StructuredQName getFunctionQName() {
          return new StructuredQName("efx", "http://test/saxon/ext", "simple");
      }
  
      @Override
      public ExtensionFunctionCall makeCallExpression() {
          return new ExtensionFunctionCall() {
  
              private static final long serialVersionUID = 1L;
  
              @Override
              public Sequence call(XPathContext xPathContext, Sequence[] sequences) throws XPathException {
                  // get value of first arg passed to the function
                  Item arg1 = sequences[0].head();
                  String arg1Val = arg1.getStringValue();
  
                  // return a altered version of the first arg
                  return new StringValue("arg1[" + arg1Val + "]");
              }
          };
      }
  }
  