DefaultMessageFactory.java

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/*
 * Copyright (C) 2011 Google Inc.
 * 
 * Licensed 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.ros.internal.message;

import com.google.common.annotations.VisibleForTesting;

import org.ros.message.MessageDeclaration;
import org.ros.message.MessageDefinitionProvider;
import org.ros.message.MessageFactory;

public class DefaultMessageFactory implements MessageFactory {

  private final MessageDefinitionProvider messageDefinitionProvider;
  private final DefaultMessageInterfaceClassProvider messageInterfaceClassProvider;
  private final MessageProxyFactory messageProxyFactory;

  public DefaultMessageFactory(MessageDefinitionProvider messageDefinitionProvider) {
    this.messageDefinitionProvider = messageDefinitionProvider;
    messageInterfaceClassProvider = new DefaultMessageInterfaceClassProvider();
    messageProxyFactory = new MessageProxyFactory(getMessageInterfaceClassProvider(), this);
  }

  @Override
  public <T> T newFromType(String messageType) {
    String messageDefinition = messageDefinitionProvider.get(messageType);
    MessageDeclaration messageDeclaration = MessageDeclaration.of(messageType, messageDefinition);
    return messageProxyFactory.newMessageProxy(messageDeclaration);
  }

  @VisibleForTesting
  DefaultMessageInterfaceClassProvider getMessageInterfaceClassProvider() {
    return messageInterfaceClassProvider;
  }
}