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
   * <p>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p>
   * 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.atlas.groovy;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.Iterator;
  import java.util.List;
  
  /**
   * Groovy expression that calls a method on an object.
   */
  public class FunctionCallExpression extends AbstractFunctionExpression {
      private final String                 functionName;
      private final List<GroovyExpression> arguments = new ArrayList<>();
  
      public FunctionCallExpression(TraversalStepType type, String functionName, GroovyExpression... arguments) {
          super(type, null);
  
          this.functionName = functionName;
  
          this.arguments.addAll(Arrays.asList(arguments));
      }
  
      public FunctionCallExpression(String functionName, GroovyExpression... arguments) {
          super(null);
  
          this.functionName = functionName;
  
          this.arguments.addAll(Arrays.asList(arguments));
      }
  
      public FunctionCallExpression(TraversalStepType type, String functionName, List<GroovyExpression> arguments) {
          super(type, null);
  
          this.functionName = functionName;
  
          this.arguments.addAll(arguments);
      }
  
      public FunctionCallExpression(GroovyExpression target, String functionName, GroovyExpression... arguments) {
          super(target);
  
          this.functionName = functionName;
  
          this.arguments.addAll(Arrays.asList(arguments));
      }
  
      public FunctionCallExpression(TraversalStepType type, GroovyExpression target, String functionName, List<? extends GroovyExpression> arguments) {
          super(type, target);
  
          this.functionName = functionName;
  
          this.arguments.addAll(arguments);
      }
  
      public FunctionCallExpression(TraversalStepType type, GroovyExpression target, String functionName, GroovyExpression... arguments) {
          super(type, target);
  
          this.functionName = functionName;
  
          this.arguments.addAll(Arrays.asList(arguments));
      }
  
      public void addArgument(GroovyExpression expr) {
          arguments.add(expr);
      }
  
      public List<GroovyExpression> getArguments() {
          return Collections.unmodifiableList(arguments);
      }
  
      public String getFunctionName() {
          return functionName;
      }
  
      @Override
      public void generateGroovy(GroovyGenerationContext context) {
          if (getCaller() != null) {
              getCaller().generateGroovy(context);
              context.append(".");
          }
  
          context.append(functionName);
          context.append("(");
  
          for (Iterator<GroovyExpression> it = arguments.iterator(); it.hasNext(); ) {
              GroovyExpression expr = it.next();
  
              expr.generateGroovy(context);
  
              if (it.hasNext()) {
                  context.append(",");
              }
          }
  
          context.append(")");
      }
  
      @Override
      public List<GroovyExpression> getChildren() {
          List<GroovyExpression> result = new ArrayList<>(arguments.size() + 1);
  
          if (getCaller() != null) {
              result.add(getCaller());
          }
  
          result.addAll(arguments);
  
          return result;
      }
  
      @Override
      public GroovyExpression copy(List<GroovyExpression> newChildren) {
          if (getCaller() == null) {
              return new FunctionCallExpression(getType(), functionName, newChildren);
          }
  
          GroovyExpression       newTarget = newChildren.get(0);
          List<GroovyExpression> args;
  
          if (newChildren.size() > 1) {
              args = newChildren.subList(1, newChildren.size());
          } else {
              args = Collections.emptyList();
          }
  
          return new FunctionCallExpression(getType(), newTarget, functionName, args);
      }
  
      public void setArgument(int index, GroovyExpression value) {
          if (index < 0 || index >= arguments.size()) {
              throw new IllegalArgumentException("Invalid argIndex " + index);
          }
  
          arguments.set(index, value);
      }
  }
  