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/*
* Copyright (c) 2014 CEA and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Christian W. Damus (CEA) - Initial API and implementation
*
*/
package org.eclipse.papyrus.infra.properties.ui.runtime;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.eclipse.papyrus.infra.properties.contexts.Section;
/**
* An encapsulation of the hierarchical tab structure of the property sheets managed by a {@link DisplayEngine}.
* It supports distinction of repeated {@code Section}s via proxies that combine section instances with
* arbitrary {@linkplain SectionDiscriminator discriminators}.
*/
class TabModel<V> {
private final Map<Path, V> model = new HashMap<Path, V>();
TabModel() {
super();
}
public Set<String> tabIDs() {
Set<String> result = new HashSet<String>();
for (Path next : model.keySet()) {
result.add(next.tabID);
}
return Collections.unmodifiableSet(result);
}
public V get(Section section) {
return model.get(new Path(section));
}
public V get(String tabID, String sectionID) {
return model.get(new Path(tabID, sectionID));
}
public Collection<V> get(String tabID) {
List<V> result = new ArrayList<V>(4);
Path key = new Path(tabID);
for (Map.Entry<Path, V> next : model.entrySet()) {
if (next.getKey().equals(key)) {
result.add(next.getValue());
}
}
return Collections.unmodifiableList(result);
}
public V put(Section section, V value) {
return model.put(new Path(section), value);
}
public V put(String tabID, String sectionID, V value) {
return model.put(new Path(tabID, sectionID), value);
}
public V remove(Section section) {
return model.remove(new Path(section));
}
public V remove(String tabID, String sectionID) {
return model.remove(new Path(tabID, sectionID));
}
public Collection<V> remove(String tabID) {
List<V> result = new ArrayList<V>(4);
Path key = new Path(tabID);
for (V next = model.remove(key); next != null; next = model.remove(key)) {
result.add(next);
}
return Collections.unmodifiableList(result);
}
public Collection<V> clear() {
List<V> result = new ArrayList<V>(model.values());
model.clear();
return Collections.unmodifiableList(result);
}
@Override
public String toString() {
return String.format("TabModel%s", model.toString()); //$NON-NLS-1$
}
//
// Nested types
//
final static class Path {
// Do not intern this string! Deliberately constructing a new String instance
private static final String WILDCARD = new String("*"); //$NON-NLS-1$
final String tabID;
final String sectionID;
final Object discriminator;
Path(String tabID, String sectionID, Object discriminator) {
checkWildcard(tabID);
checkWildcard(sectionID);
this.tabID = tabID;
this.sectionID = sectionID;
this.discriminator = (discriminator == null) ? WILDCARD : discriminator;
}
Path(String tabID, String sectionID) {
this(tabID, sectionID, WILDCARD);
}
/**
* Create a wildcard path for all sections in a tab.
*/
Path(String tabID) {
checkWildcard(tabID);
this.tabID = tabID;
this.sectionID = WILDCARD;
this.discriminator = WILDCARD;
}
/**
* Create a path for a specific section.
*/
Path(Section section) {
this(section.getTab().getId(), section.getName(), SectionDiscriminator.getDiscriminator(section));
}
static void checkWildcard(String id) {
// Deliberately testing for identity of non-interned string
if ((id == null) || (id == WILDCARD)) {
throw new IllegalArgumentException("Attempt to create a wildcard path explicitly"); //$NON-NLS-1$
}
}
@Override
public String toString() {
return String.format("(%s, %s)", tabID, sectionID); //$NON-NLS-1$
}
@Override
public int hashCode() {
// This isn't great for hash-map performance, but wildcards have to have the same hash as the keys they
// match, otherwise using them to access the map won't work
return tabID.hashCode();
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof Path)) {
return false;
}
Path other = (Path) obj;
return equals(tabID, other.tabID) && equals(sectionID, other.sectionID) && equals(discriminator, other.discriminator);
}
private static boolean equals(Object anID, Object anotherID) {
// Deliberately testing for identity of non-interned string
return (anID == WILDCARD) || (anotherID == WILDCARD) || anID.equals(anotherID);
}
}
}
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