/*
* Copyright 2011 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.impl;
/**
* An implementation of {@code EditorContext} that is used as a starting point
* by EditorDrivers.
*
* @param <T> the type of data being edited
*/
public class RootEditorContext<T> extends AbstractEditorContext<T> {
private final Class<T> editedType;
private final T value;
public RootEditorContext(AbstractEditorDelegate<T, ?> editorDelegate,
Class<T> editedType, T value) {
super(editorDelegate.getEditor(), editorDelegate.getPath());
setEditorDelegate(editorDelegate);
this.editedType = editedType;
this.value = value;
}
@Override
public boolean canSetInModel() {
return true;
}
/**
* Returns {@code value}. There's no way to actually implement this check in
* GWT client-side code. In order to prevent users from having to check for
* the root context in a visitor to avoid a special case, we'll just return
* the object. If the value really isn't assignable to T, a call to
* {@link #setInModel(Object)} will fail in the generated code, which has an
* explicit cast.
*/
@Override
@SuppressWarnings("unchecked")
public T checkAssignment(Object value) {
return (T) value;
}
@Override
public Class<T> getEditedType() {
return editedType;
}
@Override
public T getFromModel() {
return value;
}
@Override
@SuppressWarnings("unchecked")
public void setInModel(T data) {
((AbstractEditorDelegate<T, ?>) getEditorDelegate()).setObject(data);
}
}