private static String byteArrayToHex(byte[] bytes) {
// final StringBuilder sb = new StringBuilder(bytes.length * 2);
final FastStringBuffer sb = new FastStringBuffer(bytes.length * 2);
for (int i = 0; i < bytes.length; i++) {
sb.append(HEXADECIMAL_DIGITS[(bytes[i] >> 4) & 0xf]);
sb.append(HEXADECIMAL_DIGITS[bytes[i] & 0xf]);
}
return sb.toString();
}
/**
* Convert a double to a BigDecimal. In general there will be several BigDecimal values that are
* equal to the supplied value, and the one we want to choose is the one with fewest non-zero
* digits. The algorithm used is rather pragmatic: look for a string of zeroes or nines, try
* rounding the number down or up as approriate, then convert the adjusted value to a double to
* see if it's equal to the original: if not, use the original value unchanged.
*
* @param value the double to be converted
* @param precision 2 for a double, 1 for a float
* @return the result of conversion to a double
*/
public static BigDecimal adjustToDecimal(double value, int precision) {
final String zeros = (precision == 1 ? "00000" : "000000000");
final String nines = (precision == 1 ? "99999" : "999999999");
BigDecimal initial = new BigDecimal(value);
BigDecimal trial = null;
FastStringBuffer fsb = new FastStringBuffer(20);
DecimalValue.decimalToString(initial, fsb);
String s = fsb.toString();
int start = (s.charAt(0) == '-' ? 1 : 0);
int p = s.indexOf(".");
int i = s.lastIndexOf(zeros);
if (i > 0) {
if (p < 0 || i < p) {
// we're in the integer part
// try replacing all following digits with zeros and seeing if we get the same double back
FastStringBuffer sb = new FastStringBuffer(s.length());
sb.append(s.substring(0, i));
for (int n = i; n < s.length(); n++) {
sb.append(s.charAt(n) == '.' ? '.' : '0');
}
trial = new BigDecimal(sb.toString());
} else {
// we're in the fractional part
// try truncating the number before the zeros and seeing if we get the same double back
trial = new BigDecimal(s.substring(0, i));
}
} else {
i = s.indexOf(nines);
if (i >= 0) {
if (i == start) {
// number starts with 99999... or -99999. Try rounding up to 100000.. or -100000...
FastStringBuffer sb = new FastStringBuffer(s.length() + 1);
if (start == 1) {
sb.append('-');
}
sb.append('1');
for (int n = start; n < s.length(); n++) {
sb.append(s.charAt(n) == '.' ? '.' : '0');
}
trial = new BigDecimal(sb.toString());
} else {
// try rounding up
while (i >= 0 && (s.charAt(i) == '9' || s.charAt(i) == '.')) {
i--;
}
if (i < 0 || s.charAt(i) == '-') {
return initial; // can't happen: we've already handled numbers starting 99999..
} else if (p < 0 || i < p) {
// we're in the integer part
FastStringBuffer sb = new FastStringBuffer(s.length());
sb.append(s.substring(0, i));
sb.append((char) ((int) s.charAt(i) + 1));
for (int n = i; n < s.length(); n++) {
sb.append(s.charAt(n) == '.' ? '.' : '0');
}
trial = new BigDecimal(sb.toString());
} else {
// we're in the fractional part - can ignore following digits
String s2 = s.substring(0, i) + (char) ((int) s.charAt(i) + 1);
trial = new BigDecimal(s2);
}
}
}
}
if (trial != null
&& (precision == 1 ? trial.floatValue() == value : trial.doubleValue() == value)) {
return trial;
} else {
return initial;
}
}
public static PooledXPathExpression getXPathExpression(
PropertyContext propertyContext,
List<Item> contextItems,
int contextPosition,
String xpathString,
Map<String, String> prefixToURIMap,
Map<String, ValueRepresentation> variableToValueMap,
FunctionLibrary functionLibrary,
String baseURI,
boolean isAvt,
boolean testNoCache,
LocationData locationData) {
try {
// Find pool from cache
final Long validity = (long) 0;
final Cache cache = ObjectCache.instance(XPATH_CACHE_NAME, XPATH_CACHE_DEFAULT_SIZE);
final FastStringBuffer cacheKeyString = new FastStringBuffer(xpathString);
{
if (functionLibrary != null) { // This is ok
cacheKeyString.append('|');
cacheKeyString.append(Integer.toString(functionLibrary.hashCode()));
}
}
{
// NOTE: Mike Kay confirms on 2007-07-04 that compilation depends on the namespace context,
// so we need
// to use it as part of the cache key.
// TODO: PERF: It turns out that this takes a lot of time. Now that the namespace
// information is computed statically, we can do better.
if (DEBUG_TEST_KEY_OPTIMIZATION) {
// PERF TEST ONLY
cacheKeyString.append("|DUMMYNSVAR|");
} else {
if (prefixToURIMap != null) {
final Map<String, String> sortedMap =
(prefixToURIMap instanceof TreeMap)
? prefixToURIMap
: new TreeMap<String, String>(
prefixToURIMap); // this should make sure we always get the keys in the same
// order
for (Map.Entry<String, String> currentEntry : sortedMap.entrySet()) {
cacheKeyString.append('|');
cacheKeyString.append(currentEntry.getKey());
cacheKeyString.append('=');
cacheKeyString.append(currentEntry.getValue());
}
}
}
}
if (DEBUG_TEST_KEY_OPTIMIZATION) {
// PERF TEST ONLY
// NOP
} else {
if (variableToValueMap != null && variableToValueMap.size() > 0) {
// There are some variables in scope. They must be part of the key
// TODO: Put this in static state as this can be determined statically once and for all
for (final String variableName : variableToValueMap.keySet()) {
cacheKeyString.append('|');
cacheKeyString.append(variableName);
}
}
}
{
// Add this to the key as evaluating "name" as XPath or as AVT is very different!
cacheKeyString.append('|');
cacheKeyString.append(Boolean.toString(isAvt));
}
// TODO: Add baseURI to cache key (currently, baseURI is pretty much unused)
final Set<String> variableNames =
(variableToValueMap != null) ? variableToValueMap.keySet() : null;
final PooledXPathExpression expr;
if (testNoCache) {
// For testing only: don't get expression from cache
final Object o =
new XFormsCachePoolableObjetFactory(
null,
xpathString,
prefixToURIMap,
variableNames,
functionLibrary,
baseURI,
isAvt,
false,
locationData)
.makeObject();
expr = (PooledXPathExpression) o;
} else {
// Get or create pool
final InternalCacheKey cacheKey =
new InternalCacheKey("XPath Expression2", cacheKeyString.toString());
ObjectPool pool = (ObjectPool) cache.findValid(propertyContext, cacheKey, validity);
if (pool == null) {
pool =
createXPathPool(
xpathString,
prefixToURIMap,
variableNames,
functionLibrary,
baseURI,
isAvt,
locationData);
cache.add(propertyContext, cacheKey, validity, pool);
}
// Get object from pool
final Object o = pool.borrowObject();
expr = (PooledXPathExpression) o;
}
// Set context items and position
expr.setContextItems(contextItems, contextPosition);
// Set variables
expr.setVariables(variableToValueMap);
return expr;
} catch (Exception e) {
throw handleXPathException(e, xpathString, "preparing XPath expression", locationData);
}
}
