CreateDirectory.java

package org.springframework.roo.file.undo;

import java.io.File;
import java.io.IOException;
import java.util.logging.Logger;

import org.apache.commons.io.FileUtils;
import org.apache.commons.lang3.Validate;
import org.springframework.roo.support.logging.HandlerUtils;

/**
 * {@link UndoableOperation} to create a directory, including any parents.
 * <p>
 * Note that the created instance will internally track the uppermost directory
 * it created, and remove that directory during any undo operation.
 * 
 * @author Ben Alex
 * @since 1.0
 */
public class CreateDirectory implements UndoableOperation {

  private static final Logger LOGGER = HandlerUtils.getLogger(CreateDirectory.class);

  private final File actual;
  private File deleteFrom;
  private final FilenameResolver filenameResolver;

  public CreateDirectory(final UndoManager undoManager, final FilenameResolver filenameResolver,
      final File actual) {
    Validate.notNull(undoManager, "Undo manager required");
    Validate.notNull(actual, "Actual file required");
    Validate.notNull(filenameResolver, "Filename resolver required");
    Validate.isTrue(!actual.exists(), "Actual file '%s' cannot exist", actual);
    this.filenameResolver = filenameResolver;
    this.actual = actual;

    // Figure out the first directory we should delete from
    deleteFrom = actual;
    while (true) {
      final File parent = deleteFrom.getParentFile();
      if (!parent.exists()) {
        deleteFrom = parent;
      } else {
        break;
      }
    }

    Validate.validState(this.actual.mkdirs(), "Could not create directory '%s'", actual);
    undoManager.add(this);
    LOGGER.fine("Created " + filenameResolver.getMeaningfulName(actual));
  }

  public void reset() {}

  public boolean undo() {
    boolean success = true;
    try {
      FileUtils.deleteDirectory(deleteFrom);
    } catch (IOException e) {
      success = false;
    }
    LOGGER.fine((success ? "Undo create " : "Undo failed ")
        + filenameResolver.getMeaningfulName(actual));
    return success;
  }
}