You are viewing a plain text version of this content. The canonical link for it is here.
Posted to ojb-dev@db.apache.org by ar...@apache.org on 2006/05/02 01:12:22 UTC
svn commit: r398727 -
/db/ojb/branches/OJB_1_0_RELEASE/src/java/org/apache/ojb/broker/util/ReaderInputStream.java
Author: arminw
Date: Mon May 1 16:12:20 2006
New Revision: 398727
URL: http://svn.apache.org/viewcvs?rev=398727&view=rev
Log:
helper class for LOB support
Added:
db/ojb/branches/OJB_1_0_RELEASE/src/java/org/apache/ojb/broker/util/ReaderInputStream.java
Added: db/ojb/branches/OJB_1_0_RELEASE/src/java/org/apache/ojb/broker/util/ReaderInputStream.java
URL: http://svn.apache.org/viewcvs/db/ojb/branches/OJB_1_0_RELEASE/src/java/org/apache/ojb/broker/util/ReaderInputStream.java?rev=398727&view=auto
==============================================================================
--- db/ojb/branches/OJB_1_0_RELEASE/src/java/org/apache/ojb/broker/util/ReaderInputStream.java (added)
+++ db/ojb/branches/OJB_1_0_RELEASE/src/java/org/apache/ojb/broker/util/ReaderInputStream.java Mon May 1 16:12:20 2006
@@ -0,0 +1,234 @@
+package org.apache.ojb.broker.util;
+
+/* Copyright 2002-2006 The Apache Software Foundation
+ *
+ * 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.
+ */
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.Reader;
+
+/**
+ * This class is a copy of {@link org.apache.tools.ant.util.ReaderInputStream}.
+ *
+ * @version $Id: $
+ */
+public class ReaderInputStream extends InputStream
+{
+
+ /** Source Reader */
+ private Reader in;
+
+ private String encoding = System.getProperty("file.encoding");
+
+ private byte[] slack;
+
+ private int begin;
+
+ /**
+ * Construct a <CODE>ReaderInputStream</CODE>
+ * for the specified <CODE>Reader</CODE>.
+ *
+ * @param reader <CODE>Reader</CODE>. Must not be <code>null</code>.
+ */
+ public ReaderInputStream(Reader reader)
+ {
+ in = reader;
+ }
+
+ /**
+ * Construct a <CODE>ReaderInputStream</CODE>
+ * for the specified <CODE>Reader</CODE>,
+ * with the specified encoding.
+ *
+ * @param reader non-null <CODE>Reader</CODE>.
+ * @param encoding non-null <CODE>String</CODE> encoding.
+ */
+ public ReaderInputStream(Reader reader, String encoding)
+ {
+ this(reader);
+ if(encoding == null)
+ {
+ throw new IllegalArgumentException("encoding must not be null");
+ }
+ else
+ {
+ this.encoding = encoding;
+ }
+ }
+
+ /**
+ * Reads from the <CODE>Reader</CODE>, returning the same value.
+ *
+ * @return the value of the next character in the <CODE>Reader</CODE>.
+ * @throws IOException if the original <code>Reader</code> fails to be read
+ */
+ public synchronized int read() throws IOException
+ {
+ if(in == null)
+ {
+ throw new IOException("Stream Closed");
+ }
+
+ byte result;
+ if(slack != null && begin < slack.length)
+ {
+ result = slack[begin];
+ if(++begin == slack.length)
+ {
+ slack = null;
+ }
+ }
+ else
+ {
+ byte[] buf = new byte[1];
+ if(read(buf, 0, 1) <= 0)
+ {
+ result = -1;
+ }
+ result = buf[0];
+ }
+
+ if(result < -1)
+ {
+ result += 256;
+ }
+
+ return result;
+ }
+
+ /**
+ * Reads from the <code>Reader</code> into a byte array
+ *
+ * @param b the byte array to read into
+ * @param off the offset in the byte array
+ * @param len the length in the byte array to fill
+ * @return the actual number read into the byte array, -1 at
+ * the end of the stream
+ * @throws IOException if an error occurs
+ */
+ public synchronized int read(byte[] b, int off, int len)
+ throws IOException
+ {
+ if(in == null)
+ {
+ throw new IOException("Stream Closed");
+ }
+
+ while(slack == null)
+ {
+ char[] buf = new char[len]; // might read too much
+ int n = in.read(buf);
+ if(n == -1)
+ {
+ return -1;
+ }
+ if(n > 0)
+ {
+ slack = new String(buf, 0, n).getBytes(encoding);
+ begin = 0;
+ }
+ }
+
+ if(len > slack.length - begin)
+ {
+ len = slack.length - begin;
+ }
+
+ System.arraycopy(slack, begin, b, off, len);
+
+ if((begin += len) >= slack.length)
+ {
+ slack = null;
+ }
+
+ return len;
+ }
+
+ /**
+ * Marks the read limit of the StringReader.
+ *
+ * @param limit the maximum limit of bytes that can be read before the
+ * mark position becomes invalid
+ */
+ public synchronized void mark(final int limit)
+ {
+ try
+ {
+ in.mark(limit);
+ }
+ catch(IOException ioe)
+ {
+ throw new RuntimeException(ioe.getMessage());
+ }
+ }
+
+
+ /**
+ * @return the current number of bytes ready for reading
+ * @throws IOException if an error occurs
+ */
+ public synchronized int available() throws IOException
+ {
+ if(in == null)
+ {
+ throw new IOException("Stream Closed");
+ }
+ if(slack != null)
+ {
+ return slack.length - begin;
+ }
+ if(in.ready())
+ {
+ return 1;
+ }
+ else
+ {
+ return 0;
+ }
+ }
+
+ /** @return false - mark is not supported */
+ public boolean markSupported()
+ {
+ return false; // would be imprecise
+ }
+
+ /**
+ * Resets the StringReader.
+ *
+ * @throws IOException if the StringReader fails to be reset
+ */
+ public synchronized void reset() throws IOException
+ {
+ if(in == null)
+ {
+ throw new IOException("Stream Closed");
+ }
+ slack = null;
+ in.reset();
+ }
+
+ /**
+ * Closes the Stringreader.
+ *
+ * @throws IOException if the original StringReader fails to be closed
+ */
+ public synchronized void close() throws IOException
+ {
+ in.close();
+ slack = null;
+ in = null;
+ }
+}
---------------------------------------------------------------------
To unsubscribe, e-mail: ojb-dev-unsubscribe@db.apache.org
For additional commands, e-mail: ojb-dev-help@db.apache.org