/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.lucene.analysis.compound.hyphenation;

import java.io.Serializable;

/**
 * This class represents a hyphen. A 'full' hyphen is made of 3 parts: the
 * pre-break text, post-break text and no-break. If no line-break is generated
 * at this position, the no-break text is used, otherwise, pre-break and
 * post-break are used. Typically, pre-break is equal to the hyphen character
 * and the others are empty. However, this general scheme allows support for
 * cases in some languages where words change spelling if they're split across
 * lines, like german's 'backen' which hyphenates 'bak-ken'. BTW, this comes
 * from TeX.
 * 
 * This class has been taken from the Apache FOP project (http://xmlgraphics.apache.org/fop/). They have been slightly modified. 
 */

public class Hyphen implements Serializable {
  public String preBreak;

  public String noBreak;

  public String postBreak;

  Hyphen(String pre, String no, String post) {
    preBreak = pre;
    noBreak = no;
    postBreak = post;
  }

  Hyphen(String pre) {
    preBreak = pre;
    noBreak = null;
    postBreak = null;
  }

  @Override
  public String toString() {
    if (noBreak == null && postBreak == null && preBreak != null
        && preBreak.equals("-")) {
      return "-";
    }
    StringBuilder res = new StringBuilder("{");
    res.append(preBreak);
    res.append("}{");
    res.append(postBreak);
    res.append("}{");
    res.append(noBreak);
    res.append('}');
    return res.toString();
  }

}
