org.ocpsoft.rewrite.param.DefaultParameterStore Maven / Gradle / Ivy

Go to download
/*
 * Copyright 2013 Lincoln Baxter, III
 * 
 * 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.ocpsoft.rewrite.param;

import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import org.ocpsoft.common.services.ServiceLoader;
import org.ocpsoft.common.util.Assert;
import org.ocpsoft.common.util.Iterators;
import org.ocpsoft.logging.Logger;
import org.ocpsoft.rewrite.spi.GlobalParameterProvider;
import org.ocpsoft.rewrite.util.ServiceLogger;

/**
 * {@link Parameter} store which retains the order, bindings, and names of parameters contained within.
 */
public class DefaultParameterStore implements ParameterStore
{
   private final Map> parameters = new LinkedHashMap>();
   private static List providers;
   private static final Logger log = Logger.getLogger(DefaultParameterStore.class);

   @SuppressWarnings("unchecked")
   public DefaultParameterStore()
   {
      if (providers == null)
      {
         providers = Iterators.asList(ServiceLoader.load(GlobalParameterProvider.class));
         ServiceLogger.logLoadedServices(log, GlobalParameterProvider.class, providers);
      }

      for (GlobalParameterProvider provider : providers)
      {
         Set> params = provider.getParameters();
         if (params != null)
         {
            for (Parameter parameter : params)
               store(parameter);
         }
      }

   }

   @Override
   public Parameter get(final String name, Parameter deflt)
   {
      Parameter parameter = null;
      if (parameters.get(name) != null)
      {
         parameter = parameters.get(name);
      }
      else
      {
         parameter = deflt;
         parameters.put(name, parameter);
      }

      if (parameter == null)
         throw new IllegalArgumentException("No such parameter [" + name + "] exists in parameter store.");

      return parameter;
   }

   @Override
   public Parameter get(String name)
   {
      if (!parameters.containsKey(name))
         throw new IllegalArgumentException("No such parameter [" + name + "] exists in parameter store.");
      return parameters.get(name);
   }

   @Override
   public boolean isEmpty()
   {
      return parameters.isEmpty();
   }

   public Parameter store(Parameter value)
   {
      Assert.notNull(value, "Parameter to store must not be null.");
      return parameters.put(value.getName(), value);
   }

   @Override
   public int size()
   {
      return parameters.size() - 1;
   }

   @Override
   public Iterator>> iterator()
   {
      return parameters.entrySet().iterator();
   }

   @Override
   public boolean contains(String name)
   {
      return parameters.containsKey(name);
   }

   @Override
   public String toString()
   {
      return parameters.keySet().toString();
   }
}