| /* |
| * 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 java.io; |
| |
| import org.apache.harmony.luni.util.Msg; |
| |
| /** |
| * A specialized {@link InputStream} that reads bytes from a {@code String} in |
| * a sequential manner. |
| * |
| * @deprecated Use {@link StringReader} |
| */ |
| @Deprecated |
| public class StringBufferInputStream extends InputStream { |
| /** |
| * The source string containing the data to read. |
| */ |
| protected String buffer; |
| |
| /** |
| * The total number of characters in the source string. |
| */ |
| protected int count; |
| |
| /** |
| * The current position within the source string. |
| */ |
| protected int pos; |
| |
| /** |
| * Construct a new {@code StringBufferInputStream} with {@code str} as |
| * source. The size of the stream is set to the {@code length()} of the |
| * string. |
| * |
| * @param str |
| * the source string for this stream. |
| * @throws NullPointerException |
| * if {@code str} is {@code null}. |
| */ |
| public StringBufferInputStream(String str) { |
| if (str == null) { |
| throw new NullPointerException(); |
| } |
| buffer = str; |
| count = str.length(); |
| } |
| |
| /** |
| * Returns the number of bytes that are available before this stream will |
| * block. |
| * |
| * @return the number of bytes available before blocking. |
| */ |
| @Override |
| public synchronized int available() { |
| return count - pos; |
| } |
| |
| /** |
| * Reads a single byte from the source string and returns it as an integer |
| * in the range from 0 to 255. Returns -1 if the end of the source string |
| * has been reached. |
| * |
| * @return the byte read or -1 if the end of the source string has been |
| * reached. |
| */ |
| @Override |
| public synchronized int read() { |
| return pos < count ? buffer.charAt(pos++) & 0xFF : -1; |
| } |
| |
| /** |
| * Reads at most {@code length} bytes from the source string and stores them |
| * in the byte array {@code b} starting at {@code offset}. |
| * |
| * @param b |
| * the byte array in which to store the bytes read. |
| * @param offset |
| * the initial position in {@code b} to store the bytes read from |
| * this stream. |
| * @param length |
| * the maximum number of bytes to store in {@code b}. |
| * @return the number of bytes actually read or -1 if the end of the source |
| * string has been reached. |
| * @throws IndexOutOfBoundsException |
| * if {@code offset < 0} or {@code length < 0}, or if |
| * {@code offset + length} is greater than the length of |
| * {@code b}. |
| * @throws NullPointerException |
| * if {@code b} is {@code null}. |
| */ |
| @Override |
| public synchronized int read(byte b[], int offset, int length) { |
| // According to 22.7.6 should return -1 before checking other |
| // parameters. |
| if (pos >= count) { |
| return -1; |
| } |
| if (b == null) { |
| // K0047=buffer is null |
| throw new NullPointerException(Msg.getString("K0047")); //$NON-NLS-1$ |
| } |
| // avoid int overflow |
| if (offset < 0 || offset > b.length) { |
| // K002e=Offset out of bounds \: {0} |
| throw new ArrayIndexOutOfBoundsException(Msg.getString("K002e", offset)); //$NON-NLS-1$ |
| } |
| if (length < 0 || length > b.length - offset) { |
| // K0031=Length out of bounds \: {0} |
| throw new ArrayIndexOutOfBoundsException(Msg.getString("K0031", length)); //$NON-NLS-1$ |
| } |
| |
| if (length == 0) { |
| return 0; |
| } |
| |
| int copylen = count - pos < length ? count - pos : length; |
| for (int i = 0; i < copylen; i++) { |
| b[offset + i] = (byte) buffer.charAt(pos + i); |
| } |
| pos += copylen; |
| return copylen; |
| } |
| |
| /** |
| * Resets this stream to the beginning of the source string. |
| */ |
| @Override |
| public synchronized void reset() { |
| pos = 0; |
| } |
| |
| /** |
| * Skips {@code n} characters in the source string. It does nothing and |
| * returns 0 if {@code n} is negative. Less than {@code n} characters are |
| * skipped if the end of the source string is reached before the operation |
| * completes. |
| * |
| * @param n |
| * the number of characters to skip. |
| * @return the number of characters actually skipped. |
| */ |
| @Override |
| public synchronized long skip(long n) { |
| if (n <= 0) { |
| return 0; |
| } |
| |
| int numskipped; |
| if (this.count - pos < n) { |
| numskipped = this.count - pos; |
| pos = this.count; |
| } else { |
| numskipped = (int) n; |
| pos += n; |
| } |
| return numskipped; |
| } |
| } |