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Find.java
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Find.java
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package org.basex.core.cmd;
import static org.basex.util.Token.*;
import org.basex.core.Context;
import org.basex.query.path.Axis;
import org.basex.util.Array;
import org.basex.util.TokenBuilder;
import org.basex.util.XMLToken;
import org.basex.util.list.BoolList;
import org.basex.util.list.StringList;
import org.basex.util.list.TokenList;
/**
* Evaluates the 'find' command and processes a simplified request as XQuery.
*
* @author BaseX Team 2005-12, BSD License
* @author Christian Gruen
*/
public final class Find extends AQuery {
/**
* Default constructor.
* @param query simplified query
*/
public Find(final String query) {
super(DATAREF, query);
}
@Override
protected boolean run() {
return query(find(args[0], context, false));
}
/**
* Creates an XQuery representation for the specified query.
* @param query query
* @param ctx database context
* @param root root flag
* @return query
*/
public static String find(final String query, final Context ctx,
final boolean root) {
// treat input as XQuery
if(query.startsWith("/")) return query;
final boolean r = root || ctx.root();
if(query.isEmpty()) return r ? "/" : ".";
// parse user input
final String qu = query.replaceAll(" \\+", " ");
final String[] terms = split(qu);
String pre = "";
String preds = "";
final String tag = "*";
for(String term : terms) {
if(term.startsWith("@=")) {
preds += "[@* = \"" + term.substring(2) + "\"]";
} else if(term.startsWith("=")) {
preds += "[text() = \"" + term.substring(1) + "\"]";
} else if(term.startsWith("~")) {
preds += "[text() contains text \"" + term.substring(1) +
"\" using fuzzy]";
} else if(term.startsWith("@")) {
if(term.length() == 1) continue;
preds += "[@* contains text \"" + term.substring(1) + "\"]";
term = term.substring(1);
// add valid name tests
if(XMLToken.isName(token(term))) {
pre += (r ? "" : ".") + "//@" + term + " | ";
}
} else {
preds += "[text() contains text \"" + term + "\"]";
// add valid name tests
if(XMLToken.isName(token(term))) {
pre += (r ? "/" : "") + Axis.DESC + "::*:" + term + " | ";
}
}
}
if(pre.isEmpty() && preds.isEmpty()) return root ? "/" : ".";
// create final string
final TokenBuilder tb = new TokenBuilder();
//if(opt.size() != 0) tb.add("declare ft-option" + opt + "; ");
tb.add(pre + (r ? "/" : "") + Axis.DESCORSELF + "::" + tag + preds);
return tb.toString();
}
/**
* Creates an XQuery representation for the specified table query.
* @param filter filter terms
* @param cols filter columns
* @param elem element flag
* @param tag root tag
* @param root root flag
* @return query
*/
public static String findTable(final StringList filter, final TokenList cols,
final BoolList elem, final byte[] tag, final boolean root) {
final TokenBuilder tb = new TokenBuilder();
final int is = filter.size();
for(int i = 0; i < is; ++i) {
final String[] spl = split(filter.get(i));
for(final String s : spl) {
byte[] term = token(s);
if(contains(term, '"')) term = replace(term, '\"', ' ');
term = trim(term);
if(term.length == 0) continue;
tb.add('[');
final boolean elm = elem.get(i);
tb.add(elm ? ".//" : "@");
tb.add("*:");
tb.add(cols.get(i));
if(term[0] == '<' || term[0] == '>') {
tb.add(term[0]);
tb.addLong(calcNum(substring(term, 1)));
} else {
tb.add(" contains text \"");
tb.add(term);
tb.add('"');
}
tb.add(']');
}
}
return tb.size() == 0 ? "/" : (root ? "/" : "") +
Axis.DESCORSELF + "::*:" + string(tag) + tb;
}
/**
* Returns an long value for the specified token. The suffixes "kb", "mb"
* and "gb" are considered in the calculation.
* @param tok token to be converted
* @return long
*/
private static long calcNum(final byte[] tok) {
int tl = tok.length;
final int s1 = tok.length < 1 ? 0 : lc(tok[tl - 1]);
final int s2 = tok.length < 2 ? 0 : lc(tok[tl - 2]);
int f = 0;
// evaluate suffixes
if(s1 == 'k') { tl -= 1; f = 10; }
if(s1 == 'm') { tl -= 1; f = 20; }
if(s1 == 'g') { tl -= 1; f = 30; }
if(s1 == 'b' && s2 == 'k') { tl -= 2; f = 10; }
if(s1 == 'b' && s2 == 'm') { tl -= 2; f = 20; }
if(s1 == 'b' && s2 == 'g') { tl -= 2; f = 30; }
final long i = toLong(tok, 0, tl) << f;
return i == Long.MIN_VALUE ? 0 : i;
}
/**
* Splits the string and returns an array.
* @param str string to be split
* @return array
*/
private static String[] split(final String str) {
final int l = str.length();
final String[] split = new String[l];
int s = 0;
char delim = 0;
final StringBuilder sb = new StringBuilder();
for(int i = 0; i < l; ++i) {
final char c = str.charAt(i);
if(delim == 0) {
if(c == '\'' || c == '"') {
delim = c;
} else if(!XMLToken.isChar(c) && c != '@' && c != '='
&& c != '<' && c != '>' && c != '~') {
if(sb.length() != 0) {
split[s++] = sb.toString();
sb.setLength(0);
}
} else {
sb.append(c);
}
} else {
if(c == delim) {
delim = 0;
if(sb.length() != 0) {
split[s++] = sb.toString();
sb.setLength(0);
}
} else {
if(c != '\'' && c != '"') sb.append(c);
}
}
}
if(sb.length() != 0) split[s++] = sb.toString();
return Array.copyOf(split, s);
}
}