/*
* 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.html.context;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.apache.log4j.Logger;
import org.apache.isis.core.commons.debug.DebugBuilder;
import org.apache.isis.core.commons.exceptions.IsisException;
import org.apache.isis.core.commons.exceptions.UnknownTypeException;
import org.apache.isis.core.metamodel.adapter.ObjectAdapter;
import org.apache.isis.core.runtime.system.context.IsisContext;
import org.apache.isis.viewer.html.component.Block;
import org.apache.isis.viewer.html.component.Component;
public class ObjectHistory implements Iterable<HistoryEntry> {
private static final Logger LOG = Logger.getLogger(ObjectHistory.class);
private static final int MAX = 8;
private final List<HistoryEntry> history = new ArrayList<HistoryEntry>();
private void add(final HistoryEntry entry) {
history.remove(entry);
history.add(entry);
LOG.debug("added to history: " + entry);
if (history.size() > MAX) {
LOG.debug("purging from history: " + history.get(0));
history.remove(0);
}
}
public void debug(final DebugBuilder debug) {
for (int i = history.size() - 1; i >= 0; i--) {
final HistoryEntry object = history.get(i);
debug.appendln(object.toString());
}
}
public void listObjects(final Context context, final Block navigation) {
final Block taskBar = context.getComponentFactory().createBlock("history", null);
taskBar.add(context.getComponentFactory().createHeading("History"));
for (int i = history.size() - 1; i >= 0; i--) {
try {
final HistoryEntry item = history.get(i);
Component icon;
if (item.type == HistoryEntry.OBJECT) {
final ObjectAdapter object = context.getMappedObject(item.id);
IsisContext.getPersistenceSession().resolveImmediately(object);
icon = context.getComponentFactory().createObjectIcon(object, item.id, "item");
} else if (item.type == HistoryEntry.COLLECTION) {
final ObjectAdapter object = context.getMappedCollection(item.id);
icon = context.getComponentFactory().createCollectionIcon(object, item.id);
} else {
throw new UnknownTypeException(item);
}
taskBar.add(icon);
} catch (final IsisException e) { // Catch resolveImmediately
// exception when object is
// deleted.
}
}
navigation.add(taskBar);
}
public void addObject(final String idString) {
add(new HistoryEntry(idString, HistoryEntry.OBJECT));
}
public void addCollection(final String idString) {
add(new HistoryEntry(idString, HistoryEntry.COLLECTION));
}
public Iterator<HistoryEntry> iterator() {
return history.iterator();
}
public void remove(final String existingId) {
for (final HistoryEntry entry : history) {
if (entry.id.equals(existingId)) {
history.remove(entry);
break;
}
}
}
}