/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.isis.viewer.scimpi.dispatcher.view;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import org.apache.isis.core.metamodel.adapter.ObjectAdapter;
import org.apache.isis.viewer.scimpi.dispatcher.AbstractElementProcessor;
import org.apache.isis.viewer.scimpi.dispatcher.context.RequestContext;
import org.apache.isis.viewer.scimpi.dispatcher.context.RequestContext.Scope;
import org.apache.isis.viewer.scimpi.dispatcher.processor.Request;
import org.apache.isis.viewer.scimpi.dispatcher.util.MethodsUtils;
public class History extends AbstractElementProcessor {
private static final String _HISTORY = "_history";
static class Crumb {
String name;
String link;
}
static class Crumbs implements Serializable {
private static final long serialVersionUID = 1L;
private static final int MAXIMUM_SIZE = 10;
private final List<Crumb> crumbs = new ArrayList<Crumb>();
public void add(final String name, final String link) {
for (final Crumb crumb : crumbs) {
if (crumb.link.equals(link)) {
crumbs.remove(crumb);
crumbs.add(crumb);
return;
}
}
final Crumb crumb = new Crumb();
crumb.name = name;
crumb.link = link;
crumbs.add(crumb);
if (crumbs.size() > MAXIMUM_SIZE) {
crumbs.remove(0);
}
}
public void clear() {
crumbs.clear();
}
public boolean isEmpty() {
return crumbs.size() == 0;
}
public int size() {
return crumbs.size();
}
public Iterable<Crumb> iterator() {
return crumbs;
}
}
@Override
public String getName() {
return "history";
}
@Override
public void process(final Request request) {
final String action = request.getOptionalProperty("action", "display");
final Crumbs crumbs = getCrumbs(request);
if (action.equals("display") && crumbs != null) {
write(crumbs, request);
} else if (action.equals("link")) {
final String name = request.getRequiredProperty(NAME);
final String link = request.getRequiredProperty(LINK_VIEW);
crumbs.add(name, link);
} else if (action.equals("object")) {
final String id = request.getOptionalProperty(OBJECT);
final ObjectAdapter object = MethodsUtils.findObject(request.getContext(), id);
final String name = object.titleString();
String link = request.getRequiredProperty(LINK_VIEW);
link += "?_result=" + id;
crumbs.add(name, link);
} else if (action.equals("return")) {
} else if (action.equals("clear")) {
crumbs.clear();
}
}
public void write(final Crumbs crumbs, final Request request) {
if (crumbs.isEmpty()) {
return;
}
request.appendHtml("<div id=\"history\">");
int i = 0;
final int length = crumbs.size();
for (final Crumb crumb : crumbs.iterator()) {
final String link = crumb.link;
if (i > 0) {
request.appendHtml("<span class=\"separator\"> | </span>");
}
if (i == length - 1 || link == null) {
request.appendHtml("<span class=\"disabled\">");
request.appendHtml(crumb.name);
request.appendHtml("</span>");
} else {
request.appendHtml("<a class=\"linked\" href=\"" + link + "\">");
request.appendHtml(crumb.name);
request.appendHtml("</a>");
}
i++;
}
request.appendHtml("</div>");
}
private Crumbs getCrumbs(final Request request) {
final RequestContext context = request.getContext();
Crumbs crumbs = (Crumbs) context.getVariable(_HISTORY);
if (crumbs == null) {
crumbs = new Crumbs();
context.addVariable(_HISTORY, crumbs, Scope.SESSION);
}
return crumbs;
}
}