package org.basex.query.item;
import static org.basex.data.DataText.*;
import org.basex.query.QueryException;
import org.basex.query.expr.Expr;
import org.basex.util.InputInfo;
import org.basex.util.Token;
import org.basex.util.list.ByteList;
/**
* String item.
*
* @author BaseX Team 2005-12, BSD License
* @author Christian Gruen
*/
public class Str extends Item {
/** Zero-length string. */
public static final Str ZERO = new Str(Token.EMPTY);
/** String data. */
final byte[] val;
/**
* Constructor.
* @param v value
*/
private Str(final byte[] v) {
this(v, AtomType.STR);
}
/**
* Constructor.
* @param v value
* @param t data type
*/
Str(final byte[] v, final Type t) {
super(t);
val = v;
}
/**
* Returns an instance of this class.
* @param v value
* @return instance
*/
public static Str get(final byte[] v) {
return v.length == 0 ? ZERO : new Str(v);
}
/**
* Returns an instance of this class.
* @param v object (will be converted to token)
* @return instance
*/
public static Str get(final Object v) {
return get(Token.token(v.toString()));
}
@Override
public final byte[] string(final InputInfo ii) {
return val;
}
/**
* Returns the string value.
* @return string value
*/
public final byte[] string() {
return val;
}
@Override
public final boolean bool(final InputInfo ii) {
return string().length != 0;
}
@Override
public boolean eq(final InputInfo ii, final Item it) throws QueryException {
return Token.eq(val, it.string(ii));
}
@Override
public int diff(final InputInfo ii, final Item it) throws QueryException {
return Token.diff(val, it.string(ii));
}
@Override
public final boolean sameAs(final Expr cmp) {
if(!(cmp instanceof Str)) return false;
final Str i = (Str) cmp;
return type == i.type && Token.eq(val, i.val);
}
@Override
public final String toJava() {
return Token.string(val);
}
@Override
public final String toString() {
final ByteList tb = new ByteList();
tb.add('"');
for(final byte v : val) {
if(v == '&') tb.add(E_AMP);
else tb.add(v);
if(v == '"') tb.add(v);
}
return tb.add('"').toString();
}
}