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/**
 * Copyright 2013 Huining (Thomas) Feng ([email protected])
 *
 * 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 com.bacoder.parser.java.adapter;

import java.util.Collections;
import java.util.List;

import com.bacoder.parser.core.Adapters;
import com.bacoder.parser.java.JavaParser.FormalParameterContext;
import com.bacoder.parser.java.JavaParser.FormalParameterListContext;
import com.bacoder.parser.java.JavaParser.FormalParametersContext;
import com.bacoder.parser.java.JavaParser.LastFormalParameterContext;
import com.bacoder.parser.java.api.FormalParameter;
import com.google.common.base.Function;

public class FormalParametersAdapter
    extends JavaAdapter> {

  public FormalParametersAdapter(Adapters adapters) {
    super(adapters);
  }

  @Override
  public List adapt(FormalParametersContext context) {
    FormalParameterListContext formalParameterListContext =
        getChild(context, FormalParameterListContext.class);
    if (formalParameterListContext != null) {
      List formalParameters =
          transform(formalParameterListContext, FormalParameterContext.class,
              new Function() {
                @Override
                public FormalParameter apply(FormalParameterContext context) {
                  return getAdapter(FormalParameterAdapter.class).adapt(context);
                }
              });

      LastFormalParameterContext lastFormalParameterContext =
          getChild(context, LastFormalParameterContext.class);
      if (lastFormalParameterContext != null) {
        FormalParameter lastFormalParameter =
            getAdapter(VariableFormalParameterAdapter.class).adapt(lastFormalParameterContext);
        if (lastFormalParameter != null) {
          formalParameters.add(lastFormalParameter);
        }
      }
      return formalParameters;
    }

    return Collections.emptyList();
  }
}