ltk/org.eclipse.statet.ltk.ui/src/org/eclipse/statet/ecommons/text/ui/presentation/BasicTextStyleManager.java

/*=============================================================================#
 # Copyright (c) 2021 Stephan Wahlbrink and others.
 # 
 # This program and the accompanying materials are made available under the
 # terms of the Eclipse Public License 2.0 which is available at
 # https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
 # which is available at https://www.apache.org/licenses/LICENSE-2.0.
 # 
 # SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
 # 
 # Contributors:
 #     Stephan Wahlbrink <sw@wahlbrink.eu> - initial API and implementation
 #=============================================================================*/

package org.eclipse.statet.ecommons.text.ui.presentation;

import java.util.HashMap;
import java.util.Map;

import org.eclipse.jface.text.rules.IToken;
import org.eclipse.jface.text.rules.Token;

import org.eclipse.statet.jcommons.lang.NonNullByDefault;


@NonNullByDefault
public abstract class BasicTextStyleManager<TAttributes> implements TextStyleManager {
	
	
	private final Map<String, Token> tokenMap= new HashMap<>();
	
	
	public BasicTextStyleManager() {
	}
	
	
	/**
	 * Token access for styles.
	 * 
	 * @param key id and prefix for preference keys
	 * @return token with text style attribute
	 */
	@Override
	public IToken getToken(final String key) {
		Token token= this.tokenMap.get(key);
		if (token == null) {
			token= new Token(createTextAttributes(key));
			this.tokenMap.put(key, token);
		}
		return token;
	}
	
	protected abstract TAttributes createTextAttributes(String key);
	
	
	protected void updateTextStyles() {
		for (final Map.Entry<String, Token> token : this.tokenMap.entrySet()) {
			token.getValue().setData(createTextAttributes(token.getKey()));
		}
	}
	
}