/*
 * Copyright 2000-2009 JetBrains s.r.o.
 *
 * 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.intellij.packaging.elements;

import com.intellij.compiler.ant.Generator;
import com.intellij.packaging.artifacts.ArtifactType;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

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

/**
 * @author nik
 */
public abstract class ComplexPackagingElement<S> extends PackagingElement<S> {
  protected ComplexPackagingElement(PackagingElementType type) {
    super(type);
  }

  @Override
  public List<? extends Generator> computeAntInstructions(@NotNull PackagingElementResolvingContext resolvingContext, @NotNull AntCopyInstructionCreator creator,
                                                          @NotNull ArtifactAntGenerationContext generationContext,
                                                          @NotNull ArtifactType artifactType) {
    final List<? extends PackagingElement<?>> substitution = getSubstitution(resolvingContext, artifactType);
    if (substitution == null) {
      return Collections.emptyList();
    }

    final List<Generator> fileSets = new ArrayList<>();
    for (PackagingElement<?> element : substitution) {
      fileSets.addAll(element.computeAntInstructions(resolvingContext, creator, generationContext, artifactType));
    }
    return fileSets;
  }


  @Nullable
  public abstract List<? extends PackagingElement<?>> getSubstitution(@NotNull PackagingElementResolvingContext context, @NotNull ArtifactType artifactType);

}