| /* |
| * Copyright 2000-2009 JetBrains s.r.o. |
| * |
| * 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 com.intellij.util.text; |
| |
| import com.intellij.openapi.util.text.StringUtil; |
| import org.jetbrains.annotations.NotNull; |
| |
| public class CharArrayCharSequence implements CharSequenceBackedByArray { |
| private final char[] myChars; |
| private final int myStart; |
| private final int myEnd; |
| |
| public CharArrayCharSequence(@NotNull char... chars) { |
| this(chars, 0, chars.length); |
| } |
| |
| public CharArrayCharSequence(@NotNull char[] chars, int start, int end) { |
| if (start < 0 || end > chars.length || start > end) { |
| throw new IndexOutOfBoundsException("chars.length:" + chars.length + |
| ", start:" + start + |
| ", end:" + end); |
| } |
| myChars = chars; |
| myStart = start; |
| myEnd = end; |
| } |
| |
| @Override |
| public final int length() { |
| return myEnd - myStart; |
| } |
| |
| @Override |
| public final char charAt(int index) { |
| return myChars[index + myStart]; |
| } |
| |
| @Override |
| public CharSequence subSequence(int start, int end) { |
| return start == 0 && end == length() ? this : new CharArrayCharSequence(myChars, myStart + start, myStart + end); |
| } |
| |
| @Override |
| @NotNull |
| public String toString() { |
| return new String(myChars, myStart, myEnd - myStart); //TODO StringFactory |
| } |
| |
| @Override |
| @NotNull |
| public char[] getChars() { |
| if (myStart == 0 /*&& myEnd == myChars.length*/) return myChars; |
| char[] chars = new char[length()]; |
| System.arraycopy(myChars, myStart, chars, 0, length()); |
| return chars; |
| } |
| |
| @Override |
| public int hashCode() { |
| return StringUtil.stringHashCode(myChars, myStart, myEnd); |
| } |
| |
| @Override |
| public void getChars(@NotNull char[] dst, int dstOffset) { |
| System.arraycopy(myChars, myStart, dst, dstOffset, length()); |
| } |
| |
| @Override |
| public boolean equals(Object anObject) { |
| if (this == anObject) { |
| return true; |
| } |
| if (anObject instanceof CharSequence) { |
| CharSequence anotherString = (CharSequence)anObject; |
| int n = myEnd - myStart; |
| if (n == anotherString.length()) { |
| for (int i = 0; i < n; i++) { |
| if (myChars[myStart + i] != anotherString.charAt(i)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * See {@link java.io.Reader#read(char[], int, int)}; |
| */ |
| public int readCharsTo(int start, char[] cbuf, int off, int len) { |
| final int readChars = Math.min(len, length() - start); |
| if (readChars <= 0) return -1; |
| |
| System.arraycopy(myChars, myStart + start, cbuf, off, readChars); |
| return readChars; |
| } |
| } |