/* Copyright (c) 2009 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.wave.api;
import java.io.Serializable;
/**
* An abstract class that models a blip content.
*
* @see Element
* @see Plaintext
*/
public abstract class BlipContent implements Serializable {
/**
* Returns the textual representation of of this blip content, for example,
* if it's an element, it returns a space.
*
* @return the textual representation.
*/
public abstract String getText();
/**
* Returns this blip content as an element.
*
* @return an instance of {@link Element}, or {@code null} if it is not an
* {@link Element}.
*/
public Element asElement() {
if (!(this instanceof Element)) {
return null;
}
return Element.class.cast(this);
}
/**
* Returns this blip content as a plain-text.
*
* @return an instance of {@link Plaintext}, or {@code null} if it is not a
* {@link Plaintext}.
*/
public Plaintext asPlaintext() {
if (!(this instanceof Plaintext)) {
return null;
}
return Plaintext.class.cast(this);
}
}