package org.clearsilver;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;
/** This class is a wrapper around the HDF C API. Many features of the C API
* are not yet exposed through this wrapper.
*/
public class HDF {
long hdfptr; // stores the C HDF* pointer
HDF root; // If this is a child HDF node, points at the root node of
// the tree. For root nodes this is null. A child node needs
// to hold a reference on the root to prevent the root from
// being GC-ed.
static {
JNI.loadLibrary();
}
/** Constructs an empty HDF dataset */
public HDF() {
hdfptr = _init();
root = null;
}
/** Constructs an HDF child node. Used by other methods in this class when
* a child node needs to be constructed.
*/
private HDF(long hdfptr, HDF parent) {
this.hdfptr = hdfptr;
this.root = (parent.root != null) ? parent.root : parent;
}
/** Clean up allocated memory if neccesary. close() allows application
* to force clean up.
*/
public void close() {
// Only root nodes have ownership of the C HDF pointer, so only a root
// node needs to dealloc hdfptr.dir
if ( root == null) {
if (hdfptr != 0) {
_dealloc(hdfptr);
hdfptr = 0;
}
}
}
/** Call close() just in case when deallocating Java object.
*/
// Should be protected access (like Object).
protected void finalize() throws Throwable {
close();
super.finalize();
}
/** Loads the contents of the specified HDF file from disk into the current
* HDF object. The loaded contents are merged with the existing contents.
*/
public boolean readFile(String filename) throws IOException,
FileNotFoundException {
if (hdfptr == 0) {
throw new NullPointerException("HDF is closed.");
}
return _readFile(hdfptr, filename, fileLoader != null);
}
protected String fileLoad(String filename) throws IOException,
FileNotFoundException {
if (hdfptr == 0) {
throw new NullPointerException("HDF is closed.");
}
CSFileLoader aFileLoader = fileLoader;
if (aFileLoader == null) {
throw new NullPointerException("No fileLoader specified.");
} else {
String result = aFileLoader.load(this, filename);
if (result == null) {
throw new NullPointerException("CSFileLoader.load() returned null");
}
return result;
}
}
// The optional CS file loader to use to read in files
private CSFileLoader fileLoader = null;
/**
* Get the file loader in use, if any.
* @return the file loader in use.
*/
public CSFileLoader getFileLoader() {
return fileLoader;
}
/**
* Set the CS file loader to use
* @param fileLoader the file loader that should be used.
*/
public void setFileLoader(CSFileLoader fileLoader) {
this.fileLoader = fileLoader;
}
/** Serializes HDF contents to a file (readable by readFile)
*/
public boolean writeFile(String filename) throws IOException {
if (hdfptr == 0) {
throw new NullPointerException("HDF is closed.");
}
return _writeFile(hdfptr, filename);
}
/** Serializes HDF contents to a file (readable by readFile), but
* writes the file atomically by writing to a temp file then doing a
* rename(2) on it.
*/
public boolean writeFileAtomic(String filename) throws IOException {
if (hdfptr == 0) {
throw new NullPointerException("HDF is closed.");
}
return _writeFileAtomic(hdfptr, filename);
}
/** Parses/loads the contents of the given string as HDF into the current
* HDF object. The loaded contents are merged with the existing contents.
*/
public boolean readString(String data) {
if (hdfptr == 0) {
throw new NullPointerException("HDF is closed.");
}
return _readString(hdfptr, data);
}
/** Serializes HDF contents to a string (readable by readString)
*/
public String writeString() {
if (hdfptr == 0) {
throw new NullPointerException("HDF is closed.");
}
return _writeString(hdfptr);
}
/** Retrieves the integer value at the specified path in this HDF node's
* subtree. If the value does not exist, or cannot be converted to an
* integer, default_value will be returned. */
public int getIntValue(String hdfname, int default_value) {
if (hdfptr == 0) {
throw new NullPointerException("HDF is closed.");
}
return _getIntValue(hdfptr,hdfname,default_value);
}
/** Retrieves the value at the specified path in this HDF node's subtree.
*/
public String getValue(String hdfname, String default_value) {
if (hdfptr == 0) {
throw new NullPointerException("HDF is closed.");
}
return _getValue(hdfptr,hdfname,default_value);
}
/** Sets the value at the specified path in this HDF node's subtree. */
public void setValue(String hdfname, String value) {
if (hdfptr == 0) {
throw new NullPointerException("HDF is closed.");
}
_setValue(hdfptr,hdfname,value);
}
/** Remove the specified subtree. */
public void removeTree(String hdfname) {
if (hdfptr == 0) {
throw new NullPointerException("HDF is closed.");
}
_removeTree(hdfptr,hdfname);
}
/** Links the src hdf name to the dest. */
public void setSymLink(String hdf_name_src, String hdf_name_dest) {
if (hdfptr == 0) {
throw new NullPointerException("HDF is closed.");
}
_setSymLink(hdfptr,hdf_name_src,hdf_name_dest);
}
/** Export a date to a clearsilver tree using a specified timezone */
public void exportDate(String hdfname, TimeZone timeZone, Date date) {
if (hdfptr == 0) {
throw new NullPointerException("HDF is closed.");
}
Calendar cal = Calendar.getInstance(timeZone);
cal.setTime(date);
String sec = Integer.toString(cal.get(Calendar.SECOND));
setValue(hdfname + ".sec", sec.length() == 1 ? "0" + sec : sec);
String min = Integer.toString(cal.get(Calendar.MINUTE));
setValue(hdfname + ".min", min.length() == 1 ? "0" + min : min);
setValue(hdfname + ".24hour",
Integer.toString(cal.get(Calendar.HOUR_OF_DAY)));
// java.util.Calendar uses represents 12 o'clock as 0
setValue(hdfname + ".hour",
Integer.toString(
cal.get(Calendar.HOUR) == 0 ? 12 : cal.get(Calendar.HOUR)));
setValue(hdfname + ".am",
cal.get(Calendar.AM_PM) == Calendar.AM ? "1" : "0");
setValue(hdfname + ".mday",
Integer.toString(cal.get(Calendar.DAY_OF_MONTH)));
setValue(hdfname + ".mon",
Integer.toString(cal.get(Calendar.MONTH)+1));
setValue(hdfname + ".year",
Integer.toString(cal.get(Calendar.YEAR)));
setValue(hdfname + ".2yr",
Integer.toString(cal.get(Calendar.YEAR)).substring(2));
setValue(hdfname + ".wday",
Integer.toString(cal.get(Calendar.DAY_OF_WEEK)));
boolean tzNegative = timeZone.getRawOffset() < 0;
int tzAbsolute = java.lang.Math.abs(timeZone.getRawOffset()/1000);
String tzHour = Integer.toString(tzAbsolute/3600);
String tzMin = Integer.toString(tzAbsolute/60 - (tzAbsolute/3600)*60);
String tzString = (tzNegative ? "-" : "+")
+ (tzHour.length() == 1 ? "0" + tzHour : tzHour)
+ (tzMin.length() == 1 ? "0" + tzMin : tzMin);
setValue(hdfname + ".tzoffset", tzString);
}
/** Export a date to a clearsilver tree using a specified timezone */
public void exportDate(String hdfname, String tz, int tt) {
if (hdfptr == 0) {
throw new NullPointerException("HDF is closed.");
}
TimeZone timeZone = TimeZone.getTimeZone(tz);
if (timeZone == null) {
throw new RuntimeException("Unknown timezone: " + tz);
}
Date date = new Date((long)tt * 1000);
exportDate(hdfname, timeZone, date);
}
/** Retrieves the HDF object that is the root of the subtree at hdfpath, or
* null if no object exists at that path. */
public HDF getObj(String hdfpath) {
if (hdfptr == 0) {
throw new NullPointerException("HDF is closed.");
}
long obj_ptr = _getObj(hdfptr, hdfpath);
if ( obj_ptr == 0 ) {
return null;
}
return new HDF(obj_ptr, this);
}
/** Retrieves the HDF for the first child of the root of the subtree
* at hdfpath, or null if no child exists of that path or if the
* path doesn't exist. */
public HDF getChild(String hdfpath) {
if (hdfptr == 0) {
throw new NullPointerException("HDF is closed.");
}
long obj_ptr = _getChild(hdfptr, hdfpath);
if ( obj_ptr == 0 ) {
return null;
}
return new HDF(obj_ptr, this);
}
/** Return the root of the tree where the current node lies. If the
* current node is the root, return this. */
public HDF getRootObj() {
return root != null ? root : this;
}
/** Retrieves the HDF object that is the root of the subtree at
* hdfpath, create the subtree if it doesn't exist */
public HDF getOrCreateObj(String hdfpath) {
if (hdfptr == 0) {
throw new NullPointerException("HDF is closed.");
}
long obj_ptr = _getObj(hdfptr, hdfpath);
if ( obj_ptr == 0 ) {
// Create a node
_setValue(hdfptr, hdfpath, "");
obj_ptr = _getObj( hdfptr, hdfpath );
if ( obj_ptr == 0 ) {
return null;
}
}
return new HDF(obj_ptr, this);
}
/** Returns the name of this HDF node. The root node has no name, so
* calling this on the root node will return null. */
public String objName() {
if (hdfptr == 0) {
throw new NullPointerException("HDF is closed.");
}
return _objName(hdfptr);
}
/** Returns the value of this HDF node, or null if this node has no value.
* Every node in the tree can have a value, a child, and a next peer. */
public String objValue() {
if (hdfptr == 0) {
throw new NullPointerException("HDF is closed.");
}
return _objValue(hdfptr);
}
/** Returns the child of this HDF node, or null if there is no child.
* Use this in conjunction with objNext to walk the HDF tree. Every node
* in the tree can have a value, a child, and a next peer. */
public HDF objChild() {
if (hdfptr == 0) {
throw new NullPointerException("HDF is closed.");
}
long child_ptr = _objChild(hdfptr);
if ( child_ptr == 0 ) {
return null;
}
return new HDF(child_ptr, this);
}
/** Returns the next sibling of this HDF node, or null if there is no next
* sibling. Use this in conjunction with objChild to walk the HDF tree.
* Every node in the tree can have a value, a child, and a next peer. */
public HDF objNext() {
if (hdfptr == 0) {
throw new NullPointerException("HDF is closed.");
}
long next_ptr = _objNext(hdfptr);
if ( next_ptr == 0 ) {
return null;
}
return new HDF(next_ptr, this);
}
public void copy(String hdfpath, HDF src) {
if (hdfptr == 0 || src.hdfptr == 0) {
throw new NullPointerException("HDF is closed.");
}
_copy(hdfptr, hdfpath, src.hdfptr);
}
/**
* Generates a string representing the content of the HDF tree rooted at
* this node.
*/
public String dump() {
if (hdfptr == 0) {
throw new NullPointerException("HDF is closed.");
}
return _dump(hdfptr);
}
private static native long _init();
private static native void _dealloc(long ptr);
private native boolean _readFile(long ptr, String filename, boolean use_cb);
private static native boolean _writeFile(long ptr, String filename);
private static native boolean _writeFileAtomic(long ptr, String filename);
private static native boolean _readString(long ptr, String data);
private static native String _writeString(long ptr);
private static native int _getIntValue(long ptr, String hdfname,
int default_value);
private static native String _getValue(long ptr, String hdfname,
String default_value);
private static native void _setValue(long ptr, String hdfname,
String hdf_value);
private static native void _removeTree(long ptr, String hdfname);
private static native void _setSymLink(long ptr, String hdf_name_src,
String hdf_name_dest);
private static native long _getObj(long ptr, String hdfpath);
private static native long _getChild(long ptr, String hdfpath);
private static native long _objChild(long ptr);
private static native long _objNext(long ptr);
private static native String _objName(long ptr);
private static native String _objValue(long ptr);
private static native void _copy(long destptr, String hdfpath, long srcptr);
private static native String _dump(long ptr);
}
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