/*
* @(#)$Id: CodepointEqual.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.string;
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.dm.value.xsi.BooleanValue;
import xbird.xquery.func.BuiltInFunction;
import xbird.xquery.func.FunctionSignature;
import xbird.xquery.meta.DynamicContext;
import xbird.xquery.type.Type;
import xbird.xquery.type.TypeRegistry;
/**
* fn:codepoint-equal($comparand1 as xs:string?, $comparand2 as xs:string?) as xs:boolean?.
* <DIV lang="en">
* Returns true or false depending on whether the value of $comparand1 is equal
* to the value of $comparand2, according to the Unicode code point collation
* (http://www.w3.org/2005/xpath-functions/collation/codepoint).
* </DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
*/
public final class CodepointEqual extends BuiltInFunction {
private static final long serialVersionUID = 6044505376395565347L;
public static final String SYMBOL = "fn:codepoint-equal";
public CodepointEqual() {
super(SYMBOL, TypeRegistry.safeGet("xs:boolean?"));
}
protected FunctionSignature[] signatures() {
final FunctionSignature[] s = new FunctionSignature[1];
Type str = TypeRegistry.safeGet("xs:string?");
s[0] = new FunctionSignature(getName(), new Type[] { str, str });
return s;
}
public Sequence eval(Sequence<? extends Item> contextSeq, ValueSequence argv, DynamicContext dynEnv) throws XQueryException {
assert (argv != null && argv.size() == 2);
// If either argument is the empty sequence, the result is the empty sequence.
Item firstItem = argv.getItem(0);
if(firstItem.isEmpty()) {
return ValueSequence.EMPTY_SEQUENCE;
}
Item secondItem = argv.getItem(1);
if(secondItem.isEmpty()) {
return ValueSequence.EMPTY_SEQUENCE;
}
String comparand1 = firstItem.stringValue();
String comparand2 = secondItem.stringValue();
final boolean b = comparand1.equals(comparand2);
return b ? BooleanValue.TRUE : BooleanValue.FALSE;
}
}