/*
* Copyright 2015 Igor Maznitsa.
*
* 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.igormaznitsa.sciareto.ui.editors.mmeditors;
import com.igormaznitsa.mindmap.model.MindMap;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.annotation.Nonnull;
import javax.swing.event.TreeModelEvent;
import javax.swing.event.TreeModelListener;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;
import com.igormaznitsa.meta.annotation.MustNotContainNull;
import com.igormaznitsa.meta.common.utils.Assertions;
public final class SortedTreeModelWrapper implements TreeModel, TreeModelListener {
private final MindMap model;
private final Map<Object,List<Object>> sortedCache = new HashMap<>();
private final Comparator<Object> comparator;
public SortedTreeModelWrapper(@Nonnull final MindMap model, @Nonnull final Comparator<Object> comparator){
this.model = model;
this.comparator = comparator;
this.model.addTreeModelListener(this);
}
@Override
@Nonnull
public Object getRoot() {
return Assertions.assertNotNull(this.model.getRoot());
}
@Override
@Nonnull
public Object getChild(@Nonnull final Object parent, final int index) {
return this.getChildrenFromCache(parent).get(index);
}
@Override
public int getChildCount(@Nonnull final Object parent) {
return this.model.getChildCount(parent);
}
@Override
public boolean isLeaf(@Nonnull final Object node) {
return this.model.isLeaf(node);
}
@Override
public void valueForPathChanged(@Nonnull final TreePath path, @Nonnull final Object newValue) {
this.model.valueForPathChanged(path, newValue);
this.sortedCache.clear();
}
@Override
public int getIndexOfChild(@Nonnull final Object parent, @Nonnull final Object child) {
return getChildrenFromCache(parent).indexOf(child);
}
@Override
public void addTreeModelListener(@Nonnull final TreeModelListener l) {
this.model.addTreeModelListener(l);
}
@Override
public void removeTreeModelListener(@Nonnull final TreeModelListener l) {
this.model.removeTreeModelListener(l);
}
private void clear(){
this.sortedCache.clear();
}
@Nonnull
@MustNotContainNull
private List<Object> getChildrenFromCache(@Nonnull final Object parent){
List<Object> result = this.sortedCache.get(parent);
if (result == null){
result = new ArrayList<>();
final int childCount = model.getChildCount(parent);
for(int i=0;i<childCount;i++){
result.add(model.getChild(parent, i));
}
if (this.comparator!=null){
Collections.sort(result, this.comparator);
}
this.sortedCache.put(parent, result);
}
return result;
}
@Override
public void treeNodesChanged(@Nonnull final TreeModelEvent e) {
}
@Override
public void treeNodesInserted(@Nonnull final TreeModelEvent e) {
clear();
}
@Override
public void treeNodesRemoved(@Nonnull final TreeModelEvent e) {
clear();
}
@Override
public void treeStructureChanged(@Nonnull final TreeModelEvent e) {
clear();
}
public void dispose(){
clear();
this.model.removeTreeModelListener(this);
}
}