com.googlecode.mgwt.mvp.client.history.HTML5HistorianLegacyImpl.java Source code

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Here is the source code for com.googlecode.mgwt.mvp.client.history.HTML5HistorianLegacyImpl.java

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/*
 * Copyright 2011 Daniel Kurka
 * 
 * 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.googlecode.mgwt.mvp.client.history;

import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.http.client.UrlBuilder;
import com.google.gwt.place.shared.PlaceHistoryHandler.Historian;
import com.google.gwt.user.client.History;
import com.google.gwt.user.client.Window;
import com.google.web.bindery.event.shared.EventBus;
import com.google.web.bindery.event.shared.HandlerRegistration;
import com.google.web.bindery.event.shared.SimpleEventBus;

public class HTML5HistorianLegacyImpl implements Html5Historian, ValueChangeHandler<String> {

    public static class DefaultHistorian implements Historian {
        public com.google.gwt.event.shared.HandlerRegistration addValueChangeHandler(
                ValueChangeHandler<String> valueChangeHandler) {
            return History.addValueChangeHandler(valueChangeHandler);
        }

        public String getToken() {
            return History.getToken();
        }

        public void newItem(String token, boolean issueEvent) {
            History.newItem(token, issueEvent);
        }
    }

    private DefaultHistorian defaultHistorian;
    private EventBus eventBus = new SimpleEventBus();

    public HTML5HistorianLegacyImpl() {
        defaultHistorian = new DefaultHistorian();

        defaultHistorian.addValueChangeHandler(this);
    }

    @Override
    public void forward() {
        History.forward();

    }

    @Override
    public void back() {
        History.back();

    }

    @Override
    public void go(int number) {
        if (number > 0) {
            History.forward();
        } else {
            History.back();
        }

    }

    @Override
    public int length() {
        return -1;
    }

    @Override
    public void pushState(String data, String title, String url) {
        History.newItem(data, false);

    }

    @Override
    public void replaceState(String data, String title, String url) {
        UrlBuilder builder = Window.Location.createUrlBuilder();
        builder.setHash(data);
        Window.Location.replace(builder.buildString());

    }

    @Override
    public HandlerRegistration addPopStateHandler(PopStateHandler handler) {
        return eventBus.addHandler(PopStateEvent.getType(), handler);
    }

    @Override
    public void onValueChange(ValueChangeEvent<String> event) {
        eventBus.fireEvent(new PopStateEvent(event.getValue(), Window.getTitle(), Window.Location.getHref()));
    }

}