/**************************************************************
 * 
 * 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.
 * 
 *************************************************************/


/*
 * StorageAccess.java
 *
 * Created on 17. August 2004, 13:32
 */

package com.sun.star.sdbcx.comp.hsqldb;

/**
 *
 * @author  oj93728
 */

public class StorageAccess implements org.hsqldb.lib.Storage {
    String key;
    String name;
    boolean readonly;
    NativeStorageAccess access;
//	public SimpleLog appLog;
    /** Creates a new instance of StorageAccess */
    public StorageAccess(String name,Boolean readonly,Object key) throws java.io.IOException{
        this.key = (String)key;
        this.name = name;
        this.readonly = readonly.booleanValue();
        try {
            access = new NativeStorageAccess(name,
                    this.readonly ? "r" : "rw"
                    ,key);
        } catch(Exception e){
            throw new java.io.IOException();
        }
	//	appLog = new SimpleLog(name +".app3.log", true);
    }
    public void close() throws java.io.IOException{
		//appLog.sendLine("NIOScaledRAFile.close() ");
		//appLog.close();
        access.close(name,key);
    }

    public long getFilePointer() throws java.io.IOException{
		//appLog.sendLine("NIOScaledRAFile.getFilePointer() ");
        return access.getFilePointer(name,key);
    }

    public long length() throws java.io.IOException{
		//appLog.sendLine("NIOScaledRAFile.length() ");
        return access.length(name,key);
    }

    public int read() throws java.io.IOException{
		//appLog.sendLine("NIOScaledRAFile.read() ");
        return access.read(name,key);
    }

    public void read(byte[] b, int off, int len) throws java.io.IOException{
		//appLog.sendLine("NIOScaledRAFile.read(" + b + ","+ off +","+len + ") ");
        access.read(name,key,b,off,len);
    }

    // fredt - this is based on the same code that reads an int from the .data file in HSQLDB
    public int readInt() throws java.io.IOException{
		//appLog.sendLine("NIOScaledRAFile.readInt() ");
        byte [] tmp = new byte [4];

        int count = access.read(name,key,tmp,0, 4);

        if (count != 4){
            throw new java.io.IOException();
        }

        count = 0;
        int ch0 = tmp[count++] & 0xff;
        int ch1 = tmp[count++] & 0xff;
        int ch2 = tmp[count++] & 0xff;
        int ch3 = tmp[count] & 0xff;

        return ((ch0 << 24) + (ch1 << 16) + (ch2 << 8) + (ch3));

/*
        int ch [] = new int[4];
        for(int i = 0;i < 4; ++i){
            ch[i] = tmp[i];
            if (ch[i] < 0 ){
                ch[i] = 256 + ch[i];
            }
        }

	if ((ch[0] | ch[1] | ch[2] | ch[3]) < 0)
	    throw new java.io.IOException();
	return ((ch[0] << 24) + (ch[1] << 16) + (ch[2] << 8) + (ch[3] << 0));
        //return access.readInt(name,key);
*/
    }

    public void seek(long position) throws java.io.IOException{
		//appLog.sendLine("NIOScaledRAFile.seek("+position +") ");
        access.seek(name,key,position);
    }

    public void write(byte[] b, int offset, int length) throws java.io.IOException{
		//appLog.sendLine("NIOScaledRAFile.write(" + b + "," + offset +","+length+") ");
        access.write(name,key,b,offset,length);
    }

    public void writeInt(int v) throws java.io.IOException{
		//appLog.sendLine("NIOScaledRAFile.writeInt(" +v+") ");
        byte [] oneByte = new byte [4];
        oneByte[0] = (byte) ((v >>> 24) & 0xFF);
        oneByte[1] = (byte) ((v >>> 16) & 0xFF);
        oneByte[2] = (byte) ((v >>>  8) & 0xFF);
        oneByte[3] = (byte) ((v >>>  0) & 0xFF);

        write(oneByte,0,4);
    }

    public boolean isReadOnly() {
        return readonly;
    }

    // fredt - minor change of brackets
    public long readLong() throws java.io.IOException {
        // return ((long)(readInt()) << 32) + (readInt() & 0xFFFFFFFFL);
        return (((long) readInt()) << 32) + (((long) readInt()) & 0xFFFFFFFFL);
    }

    public boolean wasNio() {
        return false;
    }

    public void writeLong(long v) throws java.io.IOException {
		//appLog.sendLine("NIOScaledRAFile.writeLong(" +v+") ");
        byte [] oneByte = new byte [8];

        oneByte[0] = (byte) ((v >>> 56) & 0xFF);
        oneByte[1] = (byte) ((v >>> 48) & 0xFF);
        oneByte[2] = (byte) ((v >>> 40) & 0xFF);
        oneByte[3] = (byte) ((v >>> 32) & 0xFF);
        oneByte[4] = (byte) ((v >>> 24) & 0xFF);
        oneByte[5] = (byte) ((v >>> 16) & 0xFF);
        oneByte[6] = (byte) ((v >>>  8) & 0xFF);
        oneByte[7] = (byte) ((v >>>  0) & 0xFF);

        write(oneByte,0,8);
    }
}