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/*
* Copyright 2010 Google Inc.
*
* 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.google.gwt.editor.client.adapters;
import com.google.gwt.editor.client.Editor;
import java.util.ArrayList;
import java.util.List;
/**
* An entity capable of creating and destroying instances of Editors. This type
* is used by Editors which operate on ordered data, such as {@link ListEditor}.
*
* @param the type of Editor required
* @see com.google.gwt.editor.client.testing.FakeEditorSource
*/
public abstract class EditorSource> {
/**
* Create a new Editor.
*
* @param index the position at which the new Editor should be displayed
* @return an {@link Editor} of type E
*/
public abstract E create(int index);
/**
* Create multiple Editors. This method may be optionally overridden to
* provide a more efficient means of creating Editors in bulk.
*
* @param count the number of Editors desired
* @param index the position at which the new Editors should be displayed
* @return a List of {@link Editor}s of type E
*/
public List create(int count, int index) {
assert index >= 0;
List toReturn = new ArrayList(count);
for (int i = 0; i < count; i++) {
toReturn.add(create(index + i));
}
return toReturn;
}
/**
* Creates a temporary sub-Editor to use for traversal.
*
* For backwards compatibility with GWT 2.5.0 and earlier, the default implementation calls
* {@code create(0)} and {@link #dispose(Editor) disposes} the editor right away.
*
* @return an {@link Editor} of type E
* @see ListEditor#createEditorForTraversal()
* @see com.google.gwt.editor.client.EditorContext#traverseSyntheticCompositeEditor
*/
public E createEditorForTraversal() {
E toReturn = create(0);
dispose(toReturn);
return toReturn;
}
/**
* Called when an Editor no longer requires a sub-Editor. The default
* implementation is a no-op.
*
* @param subEditor an {@link Editor} of type E
*/
public void dispose(E subEditor) {
}
/**
* Re-order a sub-Editor. The default implementation is a no-op.
*
* @param editor an {@link Editor} of type E
* @param index the index of the Editor
*/
public void setIndex(E editor, int index) {
assert index >= 0;
}
}