/*
* @(#)$Id: OneOrMore.java 3619 2008-03-26 07:23:03Z yui $
*
* Copyright 2006-2008 Makoto YUI
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Contributors:
* Makoto YUI - initial implementation
*/
package xbird.xquery.func.seq;
import java.util.List;
import xbird.xquery.DynamicError;
import xbird.xquery.XQueryException;
import xbird.xquery.dm.value.Item;
import xbird.xquery.dm.value.Sequence;
import xbird.xquery.dm.value.sequence.ValueSequence;
import xbird.xquery.expr.XQExpression;
import xbird.xquery.func.*;
import xbird.xquery.meta.DynamicContext;
import xbird.xquery.meta.StaticContext;
import xbird.xquery.type.*;
import xbird.xquery.type.Type.Occurrence;
/**
* fn:one-or-more($arg as item()*) as item()+.
* <DIV lang="en"></DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
* @link http://www.w3.org/TR/xquery-operators/#func-one-or-more
*/
public final class OneOrMore extends BuiltInFunction {
private static final long serialVersionUID = -857693933671581928L;
public static final String SYMBOL = "fn:one-or-more";
public OneOrMore() {
super(SYMBOL, new SequenceType(ItemType.ANY_ITEM, Occurrence.OCC_ONE_OR_MORE));
}
protected FunctionSignature[] signatures() {
final FunctionSignature[] s = new FunctionSignature[1];
s[0] = new FunctionSignature(getName(), new Type[] { SequenceType.ANY_ITEMS });
return s;
}
@Override
public Function staticAnalysis(StaticContext context, List<? extends XQExpression> params)
throws XQueryException {
assert (params != null);
// infer return type from parameter types
assert (params.size() == 1);
XQExpression p = params.get(0);
Type prime = p.getType().prime();
assert (!(prime instanceof SequenceType));
assert (prime instanceof ItemType);
this._returnType = new SequenceType((ItemType) prime, Type.Occurrence.OCC_ONE_OR_MORE);
assert (Type.Occurrence.OCC_ONE_OR_MORE.accepts(_returnType.quantifier().getAlignment()));
return this;
}
public Sequence eval(Sequence<? extends Item> contextSeq, ValueSequence argv, DynamicContext dynEnv) throws XQueryException {
assert (argv != null && argv.size() == 1);
Item arg = argv.getItem(0);
final Type.Occurrence quantifier = arg.getType().quantifier();
if(!Type.Occurrence.OCC_ONE_OR_MORE.accepts(quantifier.getAlignment())) {
if(arg.isEmpty()) {
// Returns $arg if it contains one or more items. Otherwise, raises an error [err:FORG0004].
throw new DynamicError("err:FORG0004", "Invalid result sequence type was detected: "
+ arg.getType());
}
}
return arg;
}
}