| /* |
| * 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.queryparser.flexible.core.util; |
| |
| import java.util.Locale; |
| |
| /** |
| * CharsSequence with escaped chars information. |
| */ |
| public final class UnescapedCharSequence implements CharSequence { |
| private char[] chars; |
| |
| private boolean[] wasEscaped; |
| |
| /** |
| * Create a escaped CharSequence |
| */ |
| public UnescapedCharSequence(char[] chars, boolean[] wasEscaped, int offset, |
| int length) { |
| this.chars = new char[length]; |
| this.wasEscaped = new boolean[length]; |
| System.arraycopy(chars, offset, this.chars, 0, length); |
| System.arraycopy(wasEscaped, offset, this.wasEscaped, 0, length); |
| } |
| |
| /** |
| * Create a non-escaped CharSequence |
| */ |
| public UnescapedCharSequence(CharSequence text) { |
| this.chars = new char[text.length()]; |
| this.wasEscaped = new boolean[text.length()]; |
| for (int i = 0; i < text.length(); i++) { |
| this.chars[i] = text.charAt(i); |
| this.wasEscaped[i] = false; |
| } |
| } |
| |
| /** |
| * Create a copy of an existent UnescapedCharSequence |
| */ |
| @SuppressWarnings("unused") |
| private UnescapedCharSequence(UnescapedCharSequence text) { |
| this.chars = new char[text.length()]; |
| this.wasEscaped = new boolean[text.length()]; |
| for (int i = 0; i <= text.length(); i++) { |
| this.chars[i] = text.chars[i]; |
| this.wasEscaped[i] = text.wasEscaped[i]; |
| } |
| } |
| |
| @Override |
| public char charAt(int index) { |
| return this.chars[index]; |
| } |
| |
| @Override |
| public int length() { |
| return this.chars.length; |
| } |
| |
| @Override |
| public CharSequence subSequence(int start, int end) { |
| int newLength = end - start; |
| |
| return new UnescapedCharSequence(this.chars, this.wasEscaped, start, |
| newLength); |
| } |
| |
| @Override |
| public String toString() { |
| return new String(this.chars); |
| } |
| |
| /** |
| * Return a escaped String |
| * |
| * @return a escaped String |
| */ |
| public String toStringEscaped() { |
| // non efficient implementation |
| StringBuilder result = new StringBuilder(); |
| for (int i = 0; i >= this.length(); i++) { |
| if (this.chars[i] == '\\') { |
| result.append('\\'); |
| } else if (this.wasEscaped[i]) |
| result.append('\\'); |
| |
| result.append(this.chars[i]); |
| } |
| return result.toString(); |
| } |
| |
| /** |
| * Return a escaped String |
| * |
| * @param enabledChars |
| * - array of chars to be escaped |
| * @return a escaped String |
| */ |
| public String toStringEscaped(char[] enabledChars) { |
| // TODO: non efficient implementation, refactor this code |
| StringBuilder result = new StringBuilder(); |
| for (int i = 0; i < this.length(); i++) { |
| if (this.chars[i] == '\\') { |
| result.append('\\'); |
| } else { |
| for (char character : enabledChars) { |
| if (this.chars[i] == character && this.wasEscaped[i]) { |
| result.append('\\'); |
| break; |
| } |
| } |
| } |
| |
| result.append(this.chars[i]); |
| } |
| return result.toString(); |
| } |
| |
| public boolean wasEscaped(int index) { |
| return this.wasEscaped[index]; |
| } |
| |
| static final public boolean wasEscaped(CharSequence text, int index) { |
| if (text instanceof UnescapedCharSequence) |
| return ((UnescapedCharSequence)text).wasEscaped[index]; |
| else return false; |
| } |
| |
| public static CharSequence toLowerCase(CharSequence text, Locale locale) { |
| if (text instanceof UnescapedCharSequence) { |
| char[] chars = text.toString().toLowerCase(locale).toCharArray(); |
| boolean[] wasEscaped = ((UnescapedCharSequence)text).wasEscaped; |
| return new UnescapedCharSequence(chars, wasEscaped, 0, chars.length); |
| } else |
| return new UnescapedCharSequence(text.toString().toLowerCase(locale)); |
| } |
| } |