| /* |
| * 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.place.impl; |
| |
| import com.google.gwt.place.shared.Place; |
| import com.google.gwt.place.shared.PlaceHistoryMapperWithFactory; |
| import com.google.gwt.place.shared.PlaceTokenizer; |
| |
| /** |
| * Abstract implementation of {@link PlaceHistoryMapper}. |
| * |
| * @param <F> factory type |
| */ |
| public abstract class AbstractPlaceHistoryMapper<F> implements |
| PlaceHistoryMapperWithFactory<F> { |
| |
| /** |
| * Return value for |
| * {@link AbstractPlaceHistoryMapper#getPrefixAndToken(Place)}. |
| */ |
| public static class PrefixAndToken { |
| public final String prefix; |
| public final String token; |
| |
| public PrefixAndToken(String prefix, String token) { |
| assert prefix != null && !prefix.contains(":"); |
| this.prefix = prefix; |
| this.token = token; |
| } |
| |
| @Override |
| public String toString() { |
| return (prefix.length() == 0) ? token : prefix + ":" + token; |
| } |
| } |
| |
| protected F factory; |
| |
| public Place getPlace(String token) { |
| int colonAt = token.indexOf(':'); |
| String initial; |
| String rest; |
| if (colonAt >= 0) { |
| initial = token.substring(0, colonAt); |
| rest = token.substring(colonAt + 1); |
| } else { |
| initial = ""; |
| rest = token; |
| } |
| PlaceTokenizer<?> tokenizer = getTokenizer(initial); |
| if (tokenizer != null) { |
| return tokenizer.getPlace(rest); |
| } |
| return null; |
| } |
| |
| public String getToken(Place place) { |
| PrefixAndToken token = getPrefixAndToken(place); |
| if (token != null) { |
| return token.toString(); |
| } |
| return null; |
| } |
| |
| public void setFactory(F factory) { |
| this.factory = factory; |
| } |
| |
| /** |
| * @param newPlace what needs tokenizing |
| * @return the token, or null |
| */ |
| protected abstract PrefixAndToken getPrefixAndToken(Place newPlace); |
| |
| /** |
| * @param prefix the prefix found on the history token |
| * @return the PlaceTokenizer registered with that token, or null |
| */ |
| protected abstract PlaceTokenizer<?> getTokenizer(String prefix); |
| } |