CreateFile.java

package org.springframework.roo.file.undo;

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

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

/**
 * {@link UndoableOperation} to create a file.
 * 
 * @author Ben Alex
 * @since 1.0
 */
public class CreateFile implements UndoableOperation {

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

  private final File actual;
  private final FilenameResolver filenameResolver;

  public CreateFile(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;
    try {
      this.actual.createNewFile();
    } catch (final IOException ioe) {
      throw new IllegalStateException("Unable to create file '" + this.actual + "'", ioe);
    }
    undoManager.add(this);
  }

  public void reset() {}

  public boolean undo() {
    final boolean success = actual.delete();
    LOGGER.fine((success ? "Undo create " : "Undo failed ")
        + filenameResolver.getMeaningfulName(actual));
    return success;
  }
}