MultipleUndo.java

package com.revolsys.swing.undo;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import javax.swing.undo.UndoableEdit;

public class MultipleUndo extends AbstractUndoableEdit {
  private static final long serialVersionUID = 1L;

  private final List<UndoableEdit> edits;

  public MultipleUndo() {
    this(new ArrayList<UndoableEdit>());
  }

  public MultipleUndo(final List<UndoableEdit> edits) {
    this.edits = new ArrayList<>(edits);
  }

  public MultipleUndo(final UndoableEdit... edits) {
    this(Arrays.asList(edits));
  }

  @Override
  public boolean addEdit(final UndoableEdit edit) {
    if (edit == null || isHasBeenDone()) {
      return false;
    } else {
      this.edits.add(edit);
      return true;
    }
  }

  @Override
  public boolean canRedo() {
    for (final UndoableEdit edit : this.edits) {
      if (!edit.canRedo()) {
        return false;
      }
    }
    return true;
  }

  @Override
  public boolean canUndo() {
    for (int i = this.edits.size() - 1; i >= 0; i--) {
      final UndoableEdit edit = this.edits.get(i);
      if (!edit.canUndo()) {
        return false;
      }
    }
    return true;
  }

  public boolean isEmpty() {
    return this.edits.isEmpty();
  }

  @Override
  protected void redoDo() {
    for (final UndoableEdit edit : this.edits) {
      edit.redo();
    }
  }

  @Override
  protected void undoDo() {
    for (int i = this.edits.size() - 1; i >= 0; i--) {
      final UndoableEdit edit = this.edits.get(i);
      edit.undo();
    }
  }
}