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.cayenne.exp.parser;
  
  import java.io.IOException;
  
  import org.apache.cayenne.exp.Expression;
  
  /**
   * @since 4.2
   */
  public class ASTCustomOperator extends SimpleNode {
  
      private String operator;
  
      public ASTCustomOperator(int id) {
          super(id);
      }
  
      public ASTCustomOperator(String operator) {
          super(ExpressionParser.JJTCUSTOMOPERATOR);
          this.operator = operator;
      }
  
      public ASTCustomOperator(String operator, Object[] nodes) {
          super(ExpressionParser.JJTCUSTOMOPERATOR);
          this.operator = operator;
          int len = nodes.length;
          for (int i = 0; i < len; i++) {
              jjtAddChild(wrapChild(nodes[i]), i);
          }
  
          connectChildren();
      }
  
      @Override
      public void jjtAddChild(Node n, int i) {
          // First argument should be used as an operator when created by the expression parser
          if(operator == null && i == 0) {
              if(!(n instanceof ASTScalar)) {
                  throw new IllegalArgumentException("ASTScalar expected, got " + n);
              }
              this.operator = ((ASTScalar) n).getValue().toString();
              return;
          }
          super.jjtAddChild(n, operator != null ? i : --i);
      }
  
      @Override
      protected Object evaluateNode(Object o) throws Exception {
          throw new UnsupportedOperationException("Can't evaluate custom operator in memory");
      }
  
      public void setOperator(String operator) {
          this.operator = operator;
      }
  
      @Override
      public void appendAsString(Appendable out) throws IOException {
          out.append("op(\"").append(operator).append("\"");
          if ((children != null) && (children.length > 0)) {
              for (Node child : children) {
                  out.append(", ");
                  if (child == null) {
                      out.append("null");
                  } else {
                      ((SimpleNode) child).appendAsString(out);
                  }
              }
          }
          out.append(")");
      }
  
      @Override
      public int getType() {
          return Expression.CUSTOM_OP;
      }
  
      public String getOperator() {
          return operator;
      }
  
      @Override
      protected String getExpressionOperator(int index) {
          return operator;
      }
  
      @Override
      public Expression shallowCopy() {
          return new ASTCustomOperator(operator);
      }
  }
  