Initial revision

From-SVN: r26263

libjava/java/io/Reader.java

@@ -0,0 +1,87 @@
+/* Copyright (C) 1998, 1999  Cygnus Solutions
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+ 
+package java.io;
+
+/**
+ * @author Per Bothner <bothner@cygnus.com>
+ * @date April 21, 1998.  
+ */
+/* Written using "Java Class Libraries", 2nd edition, plus online
+ * API docs for JDK 1.2 beta from http://www.javasoft.com.
+ * Status:  Believed complete and correct.
+ */
+
+public abstract class Reader
+{
+  protected Object lock;
+
+  protected Reader()
+  {
+    this.lock = this;
+  }
+
+  protected Reader(Object lock)
+  {
+    this.lock = lock;
+  }
+
+  abstract public int read(char buf[], int offset, int count)
+    throws IOException;
+
+  public int read(char buf[]) throws IOException
+  {
+    return read(buf, 0, buf.length);
+  }
+
+  public int read() throws IOException
+  {
+    char[] buf = new char[1];
+    int count = read(buf, 0, 1);
+    return count > 0 ? buf[0] : -1;
+  }
+
+  abstract public void close() throws IOException;
+
+  public boolean markSupported()
+  {
+    return false;
+  }
+
+  public void mark(int readLimit) throws IOException
+  {
+    throw new IOException("mark not supported");
+  }
+
+  public void reset() throws IOException
+  {
+    throw new IOException("reset not supported");
+  }
+
+  public boolean ready() throws IOException
+  {
+    return false;
+  }
+
+  public long skip(long count) throws IOException
+  {
+    if (count <= 0)
+      return 0;
+    int bsize = count > 1024 ? 1024 : (int) count;
+    char[] buffer = new char[bsize];
+    long todo = count;
+    while (todo > 0)
+      {
+	int skipped = read(buffer, 0, bsize > todo ? (int) todo : bsize);
+	if (skipped <= 0)
+	  break;
+	todo -= skipped;
+      }
+    return count - todo;
+  }
+}