| /* |
| * Copyright 2000-2013 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 org.jetbrains.annotations.NotNull; |
| |
| import java.io.Reader; |
| |
| /** |
| * @author max |
| */ |
| public class CharSequenceReader extends Reader { |
| private final CharSequence myText; |
| private int myCurPos; |
| |
| public CharSequenceReader(@NotNull CharSequence text) { |
| myText = text; |
| myCurPos = 0; |
| } |
| |
| @Override |
| public void close() {} |
| |
| @Override |
| public int read(@NotNull char[] cbuf, int off, int len) { |
| if (off < 0 || off > cbuf.length || len < 0 || off + len > cbuf.length || off + len < 0) { |
| throw new IndexOutOfBoundsException("cbuf.length="+cbuf.length+"; off="+off+"; len="+len); |
| } |
| if (len == 0) { |
| return 0; |
| } |
| |
| if (myText instanceof CharArrayCharSequence) { // Optimization |
| final int readChars = ((CharArrayCharSequence)myText).readCharsTo(myCurPos, cbuf, off, len); |
| if (readChars < 0) return -1; |
| myCurPos += readChars; |
| return readChars; |
| } |
| |
| int charsToCopy = Math.min(len, myText.length() - myCurPos); |
| if (charsToCopy <= 0) return -1; |
| |
| for (int n = 0; n < charsToCopy; n++) { |
| cbuf[n + off] = myText.charAt(n + myCurPos); |
| } |
| |
| myCurPos += charsToCopy; |
| return charsToCopy; |
| } |
| |
| @Override |
| public int read() { |
| if (myCurPos >= myText.length()) return -1; |
| return myText.charAt(myCurPos++); |
| } |
| } |