package com.ctc.wstx.dtd;
import com.ctc.wstx.util.PrefixedName;
/**
* PrefixedNameSet implementation suitable for storing small set of PrefixedName
* values (generally 8 or less). Uses linear search, and is thus the
* most compact presentation for a set
*<p>
* Notes about usage:
* <ul>
* <li>All Strings contained in {@link PrefixedName} instances are assumed
* interned, so that equality comparison can be done (both for values
* stored and keys used)
* </li>
* <li>It is assumed that sets are never empty, ie. always contain at
* least one entry.
* </li>
* <li>It is assumed that caller has ensured that there are no duplicates
* in the set -- this data structure does no further validation.
* </li>
* </ul>
*/
public final class SmallPrefixedNameSet
extends PrefixedNameSet
{
final boolean mNsAware;
final String[] mStrings;
public SmallPrefixedNameSet(boolean nsAware, PrefixedName[] names)
{
mNsAware = nsAware;
int len = names.length;
if (len == 0) { // sanity check
throw new IllegalStateException("Trying to construct empty PrefixedNameSet");
}
mStrings = new String[nsAware ? (len+len) : len];
for (int out = 0, in = 0; in < len; ++in) {
PrefixedName nk = names[in];
if (nsAware) {
mStrings[out++] = nk.getPrefix();
}
mStrings[out++] = nk.getLocalName();
}
}
public boolean hasMultiple() {
return mStrings.length > 1;
}
/**
* @return True if the set contains specified name; false if not.
*/
public boolean contains(PrefixedName name)
{
int len = mStrings.length;
String ln = name.getLocalName();
String[] strs = mStrings;
if (mNsAware) {
String prefix = name.getPrefix();
if (strs[1] == ln && strs[0] == prefix) {
return true;
}
for (int i = 2; i < len; i += 2) {
if (strs[i+1] == ln && strs[i] == prefix) {
return true;
}
}
} else {
if (strs[0] == ln) {
return true;
}
for (int i = 1; i < len; ++i) {
if (strs[i] == ln) {
return true;
}
}
}
return false;
}
public void appendNames(StringBuilder sb, String sep)
{
for (int i = 0; i < mStrings.length; ) {
if (i > 0) {
sb.append(sep);
}
if (mNsAware) {
String prefix = mStrings[i++];
if (prefix != null) {
sb.append(prefix);
sb.append(':');
}
}
sb.append(mStrings[i++]);
}
}
}