debugbyteteeoutputstream.java

derby database source code.good for you.

/*

   Derby - Class org.apache.derby.iapi.services.io.DebugByteTeeOutputStream

   Copyright 2001, 2004 The Apache Software Foundation or its licensors, as applicable.

   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.

 */
package org.apache.derby.iapi.services.io;

import java.io.*;
import org.apache.derby.iapi.services.io.AccessibleByteArrayOutputStream;


class DebugByteTeeOutputStream extends FilterOutputStream {
	private AccessibleByteArrayOutputStream tee = new AccessibleByteArrayOutputStream(256);

	DebugByteTeeOutputStream(OutputStream out) {
		super(out);
	}
	
	public void write(int b) throws IOException {
		out.write(b);
		tee.write(b);
	}

	public void write(byte[] b, int off, int len) throws IOException {

		out.write(b,off,len);
		tee.write(b,off,len);
	}


	void checkObject(Formatable f) {

		ByteArrayInputStream in = new ByteArrayInputStream(tee.getInternalByteArray(), 0, tee.size());

		FormatIdInputStream fin = new FormatIdInputStream(in);

		// now get an empty object given the format identification
		// read it in
		// then compare it???

		Formatable f1 = null;
		try {

			f1 = (Formatable) fin.readObject();

			if (f1.equals(f)) {
				return;
			}

			// If the two objects are not equal and it looks
			// like they don't implement their own equals()
			// (which requires a matching hashCode() then
			// just return. The object was read sucessfully.

			if ((f1.hashCode() == System.identityHashCode(f1)) &&
				(f.hashCode() == System.identityHashCode(f)))
				return;
		} catch (Throwable t) {
			System.out.println("FormatableError:read error    : " + t.toString());
			System.out.println("FormatableError:class written : " + f.getClass());
            if( null == f1)
                System.out.println("FormatableError:read back as null");
            else
                System.out.println("FormatableError:class read    : " + f1.getClass());
			System.out.println("FormatableError:write id      : " + FormatIdUtil.formatIdToString(f.getTypeFormatId()));
            if( null != f1)
                System.out.println("FormatableError:read id       : " + FormatIdUtil.formatIdToString(f1.getTypeFormatId()));
			t.printStackTrace(System.out);
		}

		//System.out.println("FormatableError:Class written " + f.getClass() + " format id " + f.getTypeFormatId());
		//if (f1 != null)
			//System.out.println("FormatableError:Class read    " + f1.getClass() + " format id " + f1.getTypeFormatId());
	}

}