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/* 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.activiti.cdi;

import java.util.Map;

import javax.enterprise.inject.Produces;
import javax.enterprise.inject.spi.InjectionPoint;
import javax.inject.Inject;
import javax.inject.Named;

import org.activiti.cdi.annotation.ProcessVariable;
import org.activiti.cdi.impl.ProcessVariableMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Allows to access the process variables of a managed process instance.
 * A process instance can be managed, using the {@link BusinessProcess}-bean.
 * 
 * @author Daniel Meyer
 */
public class ProcessVariables {

  private Logger logger = LoggerFactory.getLogger(ProcessVariables.class);

  @Inject private BusinessProcess businessProcess;
  @Inject private ProcessVariableMap processVariableMap;

  protected String getVariableName(InjectionPoint ip) {
    String variableName = ip.getAnnotated().getAnnotation(ProcessVariable.class).value();
    if (variableName.length() == 0) {
      variableName = ip.getMember().getName();
    }
    return variableName;
  }

  @Produces
  @ProcessVariable
  protected Object getProcessVariable(InjectionPoint ip) {
    String processVariableName = getVariableName(ip);

    if (logger.isDebugEnabled()) {
      logger.debug("Getting process variable '{}' from ProcessInstance[{}].", processVariableName, businessProcess.getProcessInstanceId());
    }

    return businessProcess.getVariable(processVariableName);
  }

  @Produces
  @Named
  protected Map processVariables() {
    return processVariableMap;     
  }
  

}