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/*******************************************************************************
* Copyright (c) 2000, 2005 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.ui.internal.texteditor;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.Platform;
import org.eclipse.ui.editors.text.EditorsUI;
/**
* Internal annotation super type hierarchy cache.
* TODO this cache is currently unbound, i.e. only limited by the number of annotation types
*
* @since 3.0
*/
public final class AnnotationTypeHierarchy {
private Map<String, String> fTypeMap;
private Map<String, AnnotationType> fTypesCache= new HashMap<>();
public AnnotationTypeHierarchy() {
}
public AnnotationType getAnnotationType(String typeName) {
AnnotationType type= fTypesCache.get(typeName);
if (type == null) {
String[] superTypes= computeSuperTypes(typeName);
type= new AnnotationType(typeName, superTypes);
fTypesCache.put(typeName, type);
}
return type;
}
public boolean isSubtype(String superType, String subtypeCandidate) {
AnnotationType type= getAnnotationType(subtypeCandidate);
return type.isSubtype(superType);
}
private String[] computeSuperTypes(String typeName) {
ArrayList<String> types= new ArrayList<>();
append(types, getDirectSuperType(typeName));
int index= 0;
while (index < types.size()) {
String type= types.get(index++);
append(types, getDirectSuperType(type));
}
String[] superTypes= new String[types.size()];
types.toArray(superTypes);
return superTypes;
}
private String getDirectSuperType(String typeName) {
return getTypeMap().get(typeName);
}
private void append(List<String> list, String string) {
if (string == null || string.trim().length() == 0)
return;
if (!list.contains(string))
list.add(string);
}
private Map<String, String> getTypeMap() {
if (fTypeMap == null)
fTypeMap= readTypes();
return fTypeMap;
}
private Map<String, String> readTypes() {
HashMap<String, String> allTypes= new HashMap<>();
IExtensionPoint extensionPoint= Platform.getExtensionRegistry().getExtensionPoint(EditorsUI.PLUGIN_ID, "annotationTypes"); //$NON-NLS-1$
if (extensionPoint != null) {
IConfigurationElement[] elements= extensionPoint.getConfigurationElements();
for (int i= 0; i < elements.length; i++) {
IConfigurationElement element= elements[i];
String name= element.getAttribute("name"); //$NON-NLS-1$
if (name == null || name.trim().length() == 0)
continue;
String parent= element.getAttribute("super"); //$NON-NLS-1$
if (parent == null || parent.trim().length() == 0)
parent= ""; //$NON-NLS-1$
allTypes.put(name, parent);
}
}
return allTypes;
}
}
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