/*
* @(#)$Id: DocAvailable.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.doc;
import java.net.URI;
import java.net.URISyntaxException;
import xbird.util.xml.XMLUtils;
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.dm.value.xsi.BooleanValue;
import xbird.xquery.func.BuiltInFunction;
import xbird.xquery.func.FunctionSignature;
import xbird.xquery.meta.DynamicContext;
import xbird.xquery.misc.QNameTable.QualifiedName;
import xbird.xquery.type.Type;
import xbird.xquery.type.TypeRegistry;
import xbird.xquery.type.xs.BooleanType;
/**
* fn:doc-available($uri as xs:string?) as xs:boolean.
* <DIV lang="en"></DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
* @link http://www.w3.org/TR/xquery-operators/#func-doc-available
*/
public final class DocAvailable extends BuiltInFunction {
private static final long serialVersionUID = -5172353587233816241L;
public static final String SYMBOL = "fn:doc-available";
public static final QualifiedName FUNC_NAME = resolve(SYMBOL);
public DocAvailable() {
super(FUNC_NAME, BooleanType.BOOLEAN);
}
protected FunctionSignature[] signatures() {
final FunctionSignature[] s = new FunctionSignature[1];
s[0] = new FunctionSignature(getName(), new Type[] { TypeRegistry.safeGet("xs:string?") });
return s;
}
public BooleanValue eval(Sequence<? extends Item> contextSeq, ValueSequence argv, DynamicContext dynEnv)
throws XQueryException {
Item uriItem = argv.getItem(0);
if(uriItem.isEmpty()) {
return BooleanValue.FALSE;
}
String uriStr = uriItem.stringValue();
// If $uri is not a valid xs:anyURI, an error is raised [err:FODC0005].
final URI docuri;
try {
final String unescaped = XMLUtils.unescapeXML(uriStr);
docuri = new URI(unescaped);
} catch (URISyntaxException e) {
throw new DynamicError("err:FODC0005", "Invalid uri: " + uriStr, e);
}
if(dynEnv.getDocumentManager().isDocumentAvailable(docuri)) {
return BooleanValue.TRUE;
} else {
return BooleanValue.FALSE;
}
}
}