/*

   Derby - Class org.apache.derby.client.am.CloseFilterInputStream

   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 org.apache.derby.client.am;

import java.io.InputStream;
import java.io.FilterInputStream;
import java.io.IOException;
import org.apache.derby.shared.common.reference.MessageId;

class CloseFilterInputStream extends FilterInputStream {
    
    private static final String ALREADY_CLOSED_ERR_MESSAGE = 
            SqlException.getMessageUtil().getTextMessage(
                MessageId.OBJECT_CLOSED);
    
    private boolean closed;
    
    public CloseFilterInputStream(InputStream is){
        
        super(is);
        closed = false;
        
    }
    
    
    public int read() 
        throws IOException {

        if(closed){
            throw new IOException(ALREADY_CLOSED_ERR_MESSAGE);
        }
        
        return super.read();
        
    }
    

    public int read(byte[] b) 
        throws IOException {
        
        if(closed){
            throw new IOException(ALREADY_CLOSED_ERR_MESSAGE);
        }

        return super.read(b);

    }
    
    
    public int read(byte[] b,
            int off,
            int len) 
        throws IOException{
        
        if(closed){
            throw new IOException(ALREADY_CLOSED_ERR_MESSAGE);
        }

        return super.read(b, off, len);

    }

    
    public long skip(long n)
        throws IOException{

        if(closed){
            throw new IOException(ALREADY_CLOSED_ERR_MESSAGE);
        }
        
        return super.skip(n);
        
    }
    
    
    public int available()
        throws IOException{
        
        if(closed){
            throw new IOException(ALREADY_CLOSED_ERR_MESSAGE);
        }

        return super.available();
        
    }
    
    
    public void close()
        throws IOException{
        
        super.close();
        closed = true;
        
    }
    
    
}
