/*
 * Copyright 2015-2020 Alexandr Evstigneev
 *
 * 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.perl5.lang.perl.util.processors;

import com.perl5.lang.perl.extensions.packageprocessor.PerlExportDescriptor;
import org.jetbrains.annotations.NotNull;

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


public abstract class PerlImportsCollector implements PerlNamespaceEntityProcessor<PerlExportDescriptor> {
  protected final List<PerlExportDescriptor> myResult;

  public PerlImportsCollector() {
    myResult = new ArrayList<>();
  }

  protected abstract boolean meetsCondition(@NotNull PerlExportDescriptor descriptor);

  @Override
  public boolean process(String namespaceName, PerlExportDescriptor entity) {
    if (entity != null && meetsCondition(entity) && !myResult.contains(entity)) {
      myResult.add(entity);
    }
    return true;
  }

  public @NotNull List<PerlExportDescriptor> getResult() {
    return myResult.isEmpty() ? Collections.emptyList() : myResult;
  }
}
