java/idea-ui/src/com/intellij/ide/util/projectWizard/importSources/JavaSourceRootDetector.java

/*
 * Copyright 2000-2011 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.ide.util.projectWizard.importSources;

import com.intellij.ide.util.projectWizard.importSources.util.CommonSourceRootDetectionUtil;
import com.intellij.openapi.util.Pair;
import com.intellij.openapi.util.io.FileUtil;
import com.intellij.openapi.util.io.FileUtilRt;
import com.intellij.util.NullableFunction;
import org.jetbrains.annotations.NotNull;

import java.io.File;
import java.util.List;

/**
 * @author nik
 */
public abstract class JavaSourceRootDetector extends ProjectStructureDetector {
  @NotNull
  @Override
  public DirectoryProcessingResult detectRoots(@NotNull File dir, @NotNull File[] children, @NotNull File base,
                                               @NotNull List<DetectedProjectRoot> result) {
    final String fileExtension = getFileExtension();
    for (File child : children) {
      if (child.isFile()) {
        if (FileUtilRt.extensionEquals(child.getName(), fileExtension)) {
          Pair<File, String> root = CommonSourceRootDetectionUtil.IO_FILE.suggestRootForFileWithPackageStatement(child, base,
                                                                                                                 getPackageNameFetcher(),
                                                                                                                 true);
          if (root != null) {
            result.add(new JavaModuleSourceRoot(root.getFirst(), root.getSecond(), getLanguageName()));
            return DirectoryProcessingResult.skipChildrenAndParentsUpTo(root.getFirst());
          }
          else {
            return DirectoryProcessingResult.SKIP_CHILDREN;
          }
        }
      }
    }
    return DirectoryProcessingResult.PROCESS_CHILDREN;
  }

  @Override
  public String getDetectorId() {
    return "Java";
  }

  @NotNull
  protected abstract String getLanguageName();

  @NotNull
  protected abstract String getFileExtension();

  @NotNull
  protected abstract NullableFunction<CharSequence, String> getPackageNameFetcher();
}