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.activemq.karaf.commands;
  
  import java.lang.reflect.Field;
  import java.lang.reflect.Type;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.felix.gogo.commands.Action;
  import org.apache.felix.gogo.commands.Argument;
  import org.apache.felix.gogo.commands.basic.AbstractCommand;
  import org.apache.felix.gogo.commands.basic.ActionPreparator;
  import org.apache.felix.gogo.commands.basic.DefaultActionPreparator;
  import org.apache.felix.service.command.CommandSession;
  import org.apache.karaf.shell.console.BlueprintContainerAware;
  import org.apache.karaf.shell.console.BundleContextAware;
  import org.apache.karaf.shell.console.CompletableFunction;
  import org.apache.karaf.shell.console.Completer;
  import org.apache.karaf.shell.console.commands.GenericType;
  import org.osgi.framework.BundleContext;
  import org.osgi.service.blueprint.container.BlueprintContainer;
  import org.osgi.service.blueprint.container.Converter;
  
  /**
   * Base command to process options and wrap native ActiveMQ console commands.
   */
  public class ActiveMQCommand extends AbstractCommand implements CompletableFunction
  {
      protected BlueprintContainer blueprintContainer;
      protected Converter blueprintConverter;
      protected String actionId;
      protected List<Completer> completers;
  
      public void setBlueprintContainer(BlueprintContainer blueprintContainer) {
          this.blueprintContainer = blueprintContainer;
      }
  
      public void setBlueprintConverter(Converter blueprintConverter) {
          this.blueprintConverter = blueprintConverter;
      }
  
      public void setActionId(String actionId) {
          this.actionId = actionId;
      }
  
      @Override
      public List<Completer> getCompleters() {
          return completers;
      }
  
      public void setCompleters(List<Completer> completers) {
          this.completers = completers;
      }
  
      @Override
      protected ActionPreparator getPreparator() throws Exception {
          return new ActiveMQActionPreparator();
      }
  
      class ActiveMQActionPreparator extends DefaultActionPreparator {
          @Override
          public boolean prepare(Action action, CommandSession session, List<Object> params) throws Exception
          {
              Map<Argument, Field> arguments = new HashMap<Argument, Field>();
              List<Argument> orderedArguments = new ArrayList<Argument>();
              // Introspect
              for (Class type = action.getClass(); type != null; type = type.getSuperclass()) {
                  for (Field field : type.getDeclaredFields()) {
                      Argument argument = field.getAnnotation(Argument.class);
                      if (argument != null) {
                          arguments.put(argument, field);
                          int index = argument.index();
                          while (orderedArguments.size() <= index) {
                              orderedArguments.add(null);
                          }
                          if (orderedArguments.get(index) != null) {
                              throw new IllegalArgumentException("Duplicate argument index: " + index);
                          }
                          orderedArguments.set(index, argument);
                      }
                  }
              }
              // Check indexes are correct
              for (int i = 0; i < orderedArguments.size(); i++) {
                  if (orderedArguments.get(i) == null) {
                      throw new IllegalArgumentException("Missing argument for index: " + i);
                  }
              }
              // Populate
              Map<Argument, Object> argumentValues = new HashMap<Argument, Object>();
              int argIndex = 0;
              for (Iterator<Object> it = params.iterator(); it.hasNext();) {
                  Object param = it.next();
                  if (argIndex >= orderedArguments.size()) {
                      throw new IllegalArgumentException("Too many arguments specified");
                  }
                  Argument argument = orderedArguments.get(argIndex);
                  if (!argument.multiValued()) {
                      argIndex++;
                  }
                  if (argument.multiValued()) {
                      List<Object> l = (List<Object>) argumentValues.get(argument);
                      if (l == null) {
                          l = new ArrayList<Object>();
                          argumentValues.put(argument, l);
                      }
                      l.add(param);
                  } else {
                      argumentValues.put(argument, param);
                  }
              }
  
              if (argumentValues.size() == 1 && arguments.size() == 1) {
                  Object val = argumentValues.values().iterator().next();
                  // short circut convert via blueprint... cause all our commands match this
                  // bluepring was failing to convert the last long param to a string for browse
                  // where dest is a numeric value - activemq-karaf-itests
                  // see: org.apache.activemq.karaf.itest.ActiveMQBrokerFeatureTest.test()
                  if (val instanceof List) {
                      Field field = arguments.values().iterator().next();
                      List<Object> values = (List<Object>) val;
                      ArrayList<String> convertedValues = new ArrayList<String>(values.size());
                      for (Object o : values) {
                          convertedValues.add(String.valueOf(o));
                      }
                      field.setAccessible(true);
                      field.set(action, convertedValues);
                      return true;
                  }
              }
  
              for (Map.Entry<Argument, Object> entry : argumentValues.entrySet()) {
                  Field field = arguments.get(entry.getKey());
                  Object value = convert(action, session, entry.getValue(), field.getGenericType());
                  field.setAccessible(true);
                  field.set(action, value);
              }
              return true;
          }
  
          @Override
          protected Object convert(Action action, CommandSession commandSession, Object o, Type type) throws Exception {
              return blueprintConverter.convert(o, new GenericType(type));
          }
      }
  
      @Override
      public Action createNewAction() {
          Action action = (Action) blueprintContainer.getComponentInstance(actionId);
          if (action instanceof BlueprintContainerAware) {
              ((BlueprintContainerAware) action).setBlueprintContainer(blueprintContainer);
          }
          if (action instanceof BundleContextAware) {
              BundleContext context = (BundleContext) blueprintContainer.getComponentInstance("blueprintBundleContext");
              ((BundleContextAware) action).setBundleContext(context);
          }
          return action;
      }
  
      @Override
      public Map<String, Completer> getOptionalCompleters() {
          //TODO implement completers
          return null;
      }
  }
  