| /* |
| * 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.netbeans.lib.editor.util; |
| |
| /** |
| * Abstract implementation of character sequence |
| * with {@link String}-like implementation |
| * of <CODE>hashCode()</CODE> and <CODE>equals()</CODE>. |
| * |
| * @author Miloslav Metelka |
| * @version 1.00 |
| */ |
| |
| public abstract class AbstractCharSequence implements CharSequence { |
| |
| /** |
| * Returns the length of this character sequence. The length is the number |
| * of 16-bit Unicode characters in the sequence. </p> |
| * |
| * @return the number of characters in this sequence |
| */ |
| public abstract int length(); |
| |
| /** |
| * Returns the character at the specified index. An index ranges from zero |
| * to <tt>length() - 1</tt>. The first character of the sequence is at |
| * index zero, the next at index one, and so on, as for array |
| * indexing. </p> |
| * |
| * @param index the index of the character to be returned |
| * |
| * @return the specified character |
| * |
| * @throws IndexOutOfBoundsException |
| * if the <tt>index</tt> argument is negative or not less than |
| * <tt>length()</tt> |
| */ |
| public abstract char charAt(int index); |
| |
| |
| private String toString(int start, int end) { |
| return CharSequenceUtilities.toString(this, start, end); |
| } |
| |
| /** |
| * Return subsequence of this character sequence. |
| * The returned character sequence is only as stable as is this character |
| * sequence. |
| * |
| * @param start >=0 starting index of the subsequence within this |
| * character sequence. |
| * @param end >=0 ending index of the subsequence within this |
| * character sequence. |
| */ |
| public CharSequence subSequence(int start, int end) { |
| return new CharSubSequence(this, start, end); |
| } |
| |
| public String toString() { |
| return toString(0, length()); |
| } |
| |
| /** |
| * Subclass providing string-like implementation |
| * of <code>hashCode()</code> and <code>equals()</code> |
| * method accepting strings with the same content |
| * like charsequence has. |
| * <br> |
| * This makes the class suitable for matching to strings |
| * e.g. in maps. |
| * <br> |
| * <b>NOTE</b>: Matching is just uni-directional |
| * i.e. charsequence.equals(string) works |
| * but string.equals(charsequence) does not. |
| */ |
| public abstract static class StringLike extends AbstractCharSequence { |
| |
| public int hashCode() { |
| return CharSequenceUtilities.stringLikeHashCode(this); |
| } |
| |
| public boolean equals(Object o) { |
| return CharSequenceUtilities.equals(this, o); |
| } |
| |
| public CharSequence subSequence(int start, int end) { |
| return new CharSubSequence.StringLike(this, start, end); |
| } |
| |
| } |
| |
| } |