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.component.xslt.extensions;
  
  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.SequenceTool;
  import net.sf.saxon.om.StructuredQName;
  import net.sf.saxon.trans.XPathException;
  import net.sf.saxon.tree.iter.SingletonIterator;
  import net.sf.saxon.value.Int64Value;
  import net.sf.saxon.value.SequenceType;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class MyExtensionFunction1 extends ExtensionFunctionDefinition {
  
      private static final long serialVersionUID = 1L;
  
      private static final Logger LOG = LoggerFactory.getLogger(MyExtensionFunction1.class);
  
      @Override
      public StructuredQName getFunctionQName() {
          return new StructuredQName("", "http://mytest/", "myExtensionFunction1");
      }
  
      @Override
      public int getMinimumNumberOfArguments() {
          return 2;
      }
  
      @Override
      public int getMaximumNumberOfArguments() {
          return 2;
      }
  
      @Override
      public SequenceType[] getArgumentTypes() {
          return new SequenceType[] { SequenceType.SINGLE_INTEGER, SequenceType.SINGLE_INTEGER };
      }
  
      @Override
      public SequenceType getResultType(SequenceType[] suppliedArgumentTypes) {
          int resultCardinality = 1;
          return SequenceType.makeSequenceType(SequenceType.SINGLE_INTEGER.getPrimaryType(), resultCardinality);
      }
  
      @Override
      public ExtensionFunctionCall makeCallExpression() {
          return new ExtensionFunctionCall() {
              private static final long serialVersionUID = 1L;
  
              @Override
              public Sequence call(XPathContext xPathContext, Sequence[] arguments) throws XPathException {
                  // 1st argument (mandatory, index 0)
                  Int64Value arg1 = (Int64Value) arguments[0].iterate().next();
                  int arg1Int = arg1.getDecimalValue().toBigInteger().intValue();
  
                  // 2nd argument (mandatory, index 1)
                  Int64Value arg2 = (Int64Value) arguments[1].iterate().next();
                  int arg2Int = arg2.getDecimalValue().toBigInteger().intValue();
  
                  // Functionality goes here
                  int resultInt = arg1Int + arg2Int;
  
                  Item result = new Int64Value(resultInt);
                  return SequenceTool.toLazySequence(SingletonIterator.makeIterator(result));
              }
          };
      }
  
  }
  