| /* |
| * 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.search.matchhighlight; |
| |
| import java.text.CharacterIterator; |
| |
| /** A {@link CharacterIterator} over a {@link CharSequence}. */ |
| final class CharSequenceIterator implements CharacterIterator { |
| private final CharSequence text; |
| |
| private int begin; |
| private int end; |
| private int pos; |
| |
| public CharSequenceIterator(CharSequence text) { |
| this.text = text; |
| this.begin = 0; |
| this.end = text.length(); |
| } |
| |
| public char first() { |
| pos = begin; |
| return current(); |
| } |
| |
| public char last() { |
| if (end != begin) { |
| pos = end - 1; |
| } else { |
| pos = end; |
| } |
| return current(); |
| } |
| |
| public char setIndex(int p) { |
| if (p < begin || p > end) throw new IllegalArgumentException("Invalid index"); |
| pos = p; |
| return current(); |
| } |
| |
| public char current() { |
| if (pos >= begin && pos < end) { |
| return text.charAt(pos); |
| } else { |
| return DONE; |
| } |
| } |
| |
| public char next() { |
| if (pos < end - 1) { |
| pos++; |
| return text.charAt(pos); |
| } else { |
| pos = end; |
| return DONE; |
| } |
| } |
| |
| public char previous() { |
| if (pos > begin) { |
| pos--; |
| return text.charAt(pos); |
| } else { |
| return DONE; |
| } |
| } |
| |
| public int getBeginIndex() { |
| return begin; |
| } |
| |
| public int getEndIndex() { |
| return end; |
| } |
| |
| public int getIndex() { |
| return pos; |
| } |
| |
| @Override |
| public Object clone() { |
| try { |
| return super.clone(); |
| } catch (CloneNotSupportedException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| } |