| /* |
| * Sun Public License Notice |
| * |
| * The contents of this file are subject to the Sun Public License |
| * Version 1.0 (the "License"). You may not use this file except in |
| * compliance with the License. A copy of the License is available at |
| * http://www.sun.com/ |
| * |
| * The Original Code is NetBeans. The Initial Developer of the Original |
| * Code is Sun Microsystems, Inc. Portions Copyright 1997-2000 Sun |
| * Microsystems, Inc. All Rights Reserved. |
| */ |
| package org.netbeans.lib.cvsclient.io; |
| |
| import org.netbeans.lib.cvsclient.util.BugLog; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.Reader; |
| |
| /** |
| * @author Thomas Singer |
| */ |
| public abstract class AbstractInputStreamReader extends Reader { |
| |
| // Abstract =============================================================== |
| |
| protected abstract int readChar(InputStream inputStream) throws IOException; |
| |
| // Fields ================================================================= |
| |
| private InputStream inputStream; |
| |
| // Setup ================================================================== |
| |
| protected AbstractInputStreamReader(InputStream inputStream) { |
| BugLog.getInstance().assertNotNull(inputStream); |
| |
| this.inputStream = inputStream; |
| } |
| |
| // Implemented ============================================================ |
| |
| public final int read() throws IOException { |
| ensureOpen(); |
| |
| return readChar(inputStream); |
| } |
| |
| public final int read(char buffer[], int startOffset, int length) throws IOException { |
| if (startOffset < 0 |
| || startOffset > buffer.length |
| || length < 0 |
| || startOffset + length > buffer.length |
| || startOffset + length < 0) { |
| throw new IndexOutOfBoundsException(); |
| } |
| |
| ensureOpen(); |
| |
| int charsRead = 0; |
| for (int offset = startOffset; length > 0; offset++, charsRead++, length--) { |
| final int value = readChar(inputStream); |
| if (value < 0) { |
| break; |
| } |
| |
| buffer[offset] = (char)value; |
| } |
| |
| return charsRead > 0 ? charsRead : -1; |
| } |
| |
| public final boolean ready() throws IOException { |
| ensureOpen(); |
| try { |
| return inputStream.available() > 0; |
| } |
| catch (IOException ex) { |
| return false; |
| } |
| } |
| |
| public final void close() throws IOException { |
| if (inputStream == null) { |
| return; |
| } |
| inputStream.close(); |
| inputStream = null; |
| } |
| |
| // Utils ================================================================== |
| |
| private void ensureOpen() throws IOException { |
| if (inputStream == null) { |
| throw new IOException("Stream closed"); |
| } |
| } |
| } |