| /* |
| * 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 com.alibaba.dubbo.common.io; |
| |
| import java.io.IOException; |
| import java.io.Reader; |
| |
| /** |
| * Thread-unsafe StringReader. |
| */ |
| public class UnsafeStringReader extends Reader { |
| private String mString; |
| |
| private int mPosition, mLimit, mMark; |
| |
| public UnsafeStringReader(String str) { |
| mString = str; |
| mLimit = str.length(); |
| mPosition = mMark = 0; |
| } |
| |
| @Override |
| public int read() throws IOException { |
| ensureOpen(); |
| if (mPosition >= mLimit) |
| return -1; |
| |
| return mString.charAt(mPosition++); |
| } |
| |
| @Override |
| public int read(char[] cs, int off, int len) throws IOException { |
| ensureOpen(); |
| if ((off < 0) || (off > cs.length) || (len < 0) || |
| ((off + len) > cs.length) || ((off + len) < 0)) |
| throw new IndexOutOfBoundsException(); |
| |
| if (len == 0) |
| return 0; |
| |
| if (mPosition >= mLimit) |
| return -1; |
| |
| int n = Math.min(mLimit - mPosition, len); |
| mString.getChars(mPosition, mPosition + n, cs, off); |
| mPosition += n; |
| return n; |
| } |
| |
| @Override |
| public long skip(long ns) throws IOException { |
| ensureOpen(); |
| if (mPosition >= mLimit) |
| return 0; |
| |
| long n = Math.min(mLimit - mPosition, ns); |
| n = Math.max(-mPosition, n); |
| mPosition += n; |
| return n; |
| } |
| |
| @Override |
| public boolean ready() throws IOException { |
| ensureOpen(); |
| return true; |
| } |
| |
| @Override |
| public boolean markSupported() { |
| return true; |
| } |
| |
| @Override |
| public void mark(int readAheadLimit) throws IOException { |
| if (readAheadLimit < 0) |
| throw new IllegalArgumentException("Read-ahead limit < 0"); |
| |
| ensureOpen(); |
| mMark = mPosition; |
| } |
| |
| @Override |
| public void reset() throws IOException { |
| ensureOpen(); |
| mPosition = mMark; |
| } |
| |
| @Override |
| public void close() throws IOException { |
| mString = null; |
| } |
| |
| private void ensureOpen() throws IOException { |
| if (mString == null) |
| throw new IOException("Stream closed"); |
| } |
| } |