//Copyright 2001 FreeHEP.
package org.freehep.graphicsio.font.encoding;

/**
 * Lookup class provides conversion between different encodings and character tables
 * using character name, encoding index, and unicode.
 * In order to add new tables original code should be modified.
 *
 * @author Sami Kama
 * @version $Id: Lookup.java,v 1.3 2003/05/09 20:31:03 duns Exp $
 */
public class Lookup {
	private static Lookup instance;
	private CharTable[] tables;

	public static Lookup getInstance() {
		if (instance ==null) {
			instance= new Lookup();
		}
		return (instance);
	}

	private int ntables=8;

	private Lookup() {
		tables = new CharTable[ntables];
		tables[0] = new Symbol();
		tables[1] = new Expert();
		tables[2] = new Zapfdingbats();
		tables[3] = new STDLatin();
		tables[4] = new MACLatin();
		tables[5] = new WINLatin();
		tables[6] = new PDFLatin();
		tables[7] = new ISOLatin();

    }

    /**
     * Converts a name to unicode.
     * This method takes name of the character and
     * returns character as a unicode character.
     *
     * @return requested unicode character.
     */
	public char toUnicode(String name) {
		for (int i=0; i<ntables; i++) {
			char uc = tables[i].toUnicode(name);
			if (uc != '\uffff') return(uc);
		}
		return('\uffff');
	}

    /**
     * Converts a unicode character to name.
     *
     * @return requested character name.
     */
	public String toName(char uc) {
		for (int i=0; i<ntables; i++) {
			String name = tables[i].toName(uc);
			if (name!=null) return(name);
		}
		return(null);
	}

    /**
     * Converts a unicode character to name.
     *
     * @return requested character name.
     */
	public String toName(Character uc) {
		for (int i=0; i<ntables; i++) {
			String name = tables[i].toName(uc);
			if (name!=null) return(name);
		}
		return(null);
	}

    /**
     * Gives the requested encoding table
     * Valid table names can be requested with a call to
     * @see #getTableNames().
     *
     * @return requested encoding.
     */
	public CharTable getTable(String tableName) {
		for (int i=0; i<ntables; i++) {
			String tblName = tables[i].getEncoding()+tables[i].getName();
			if(tblName.equalsIgnoreCase(tableName)) return(tables[i]);
		}
		return(null);
	}

    /**
     * Gives the total number of tables included in the file
     * @return number of tables
     */
	public int getNumberOfTables() {
		return(ntables);
	}

    /**
     * Gives the names of tables that can be used in a string array.
     *
     * @return An array of String[] containing the table names
     */
	public String[] getTableNames(){
		String[] tblnames = new String[ntables];
		for (int i=0;i<ntables;i++){
			tblnames[i]=tables[i].getEncoding()+tables[i].getName();
		}
		return tblnames;
	}
}