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/*
 * Copyright (c) 2001-2017, Zoltan Farkas All Rights Reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * Additionally licensed with:
 *
 * 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 org.spf4j.base;

import java.io.IOException;
import java.io.UncheckedIOException;
import javax.annotation.ParametersAreNonnullByDefault;

/**
 * Encoder that encodes an arbitrary string to an ID.
 *
 * @author Zoltan Farkas
 */
@ParametersAreNonnullByDefault
public final class LangIdEncDec {

  private LangIdEncDec() {
  }

  public static void lossyEncode(final CharSequence what, final Appendable to) throws IOException {
    int length = what.length();
    if (length == 0) {
      return;
    }
    char first = what.charAt(0);
    if (Character.isLetter(first) || first == '_') {
      to.append(first);
    } else {
      to.append('_');
    }
    for (int i = 1; i < length; i++) {
      char c = what.charAt(i);
      if (Character.isLetterOrDigit(c) || c == '_') {
        to.append(c);
      } else {
        to.append('_');
      }

    }
  }

  public static String lossyEncode(final String what) {
    if (CharSequences.isValidJavaId(what)) {
      return what;
    } else {
      int length = what.length();
      if (length == 0) {
        throw new IllegalArgumentException("Invalid id: '" + what + '\'');
      }
      StringBuilder sb = new StringBuilder(length);
      try {
        lossyEncode(what, sb);
      } catch (IOException ex) {
        throw new UncheckedIOException(ex);
      }
      return sb.toString();
    }
  }

}