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/*
* $Id$
* Copyright (C) 2001 The Apache Software Foundation. All rights reserved.
* For details on use and redistribution please refer to the
* LICENSE file included with these sources.
*/
// Seshadri
/*
* This package is to be used for all Oeprating System related activities.
* This file manages system buffers
*/
package org.apache.fop.system;
// FOP
import org.apache.fop.fo.FONode;
// Java
import java.io.*;
import java.util.Hashtable;
public class BufferManager {
protected FileWriter fw;
protected FileReader fr;
protected char cache[]; // Cache
protected long csize; // Cache size
protected File buff = null;
protected long fp = 0;
protected long markStart =
0; // used to set the current point in the stream while reading
protected long markEnd = 0;
protected long curMark = 0;
// Hash of objects and their offsets within
Hashtable offSetTable = new Hashtable();
private class Offset {
long fp = 0; // File Pointer
int length;
char[] data; // when no buffer is specified
Offset(long fp, int length, char data[]) {
this.fp = fp;
this.length = length;
this.data = data;
}
}
public void addBufferFile(File buff) {
if (buff != null)
try {
fw = new FileWriter(buff);
fr = new FileReader(buff);
csize = 100000;
this.buff = buff;
} catch (Exception e) {
System.out.println(e);
}
}
public void writeBuffer(Object obj, char arr[]) {
int length = arr.length;
if (buff != null) {
offSetTable.put(obj, new Offset(this.fp, length, null));
try {
fw.write(arr);
this.fp += length;
} catch (Exception e) {
System.out.println(e);
}
} else {
// Store the data in memory
offSetTable.put(obj, new Offset(this.fp, length, arr));
}
}
public void readComplete() {
// An indication that manager can close the writable buffers and prepare
// for reading..
if (buff != null)
try {
fw.close();
cache = new char[(int)csize];
setupCache(curMark);
} catch (Exception e) {
System.out.println(e);
}
}
public char[] readBuffer(Object obj) {
Offset values = (Offset)offSetTable.get(obj);
// Was buffering used?
if (buff != null) {
char ca[] = new char[values.length];
// Check if csize is too small
if (csize < values.length) {
System.out.println("Cache size too small");
System.exit(0);
}
// Is the data outside the cache?
if (!(values.fp >= markStart
&& values.fp + values.length <= markEnd)) {
setupCache(values.fp);
}
for (long i = values.fp - markStart, j = 0; j < values.length;
++i, ++j) {
ca[(int)j] = cache[(int)i];
}
return ca;
} else {
return values.data;
}
}
protected void setupCache(long curMark) {
try {
FileReader fr = new FileReader(buff);
fr.skip(curMark);
long rem = buff.length() - curMark;
if (rem > csize) {
rem = csize;
}
fr.read(cache, 0, (int)rem);
markStart = curMark;
markEnd = rem - 1;
} catch (Exception e) {
System.out.println(e);
}
}
}
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