/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-2015 The eXist Project
* http://exist-db.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.exist.storage.md.xquery;
import org.exist.dom.persistent.DocumentImpl;
import org.exist.dom.persistent.NodeProxy;
import org.exist.dom.QName;
import org.exist.storage.md.Meta;
import org.exist.storage.md.MetaData;
import org.exist.storage.md.Metas;
import org.exist.xmldb.XmldbURI;
import org.exist.xquery.BasicFunction;
import org.exist.xquery.Cardinality;
import org.exist.xquery.FunctionSignature;
import org.exist.xquery.XPathException;
import org.exist.xquery.XQueryContext;
import org.exist.xquery.value.*;
import org.exist.xquery.value.StringValue;
import static org.exist.storage.md.MDStorageManager.*;
/**
*
* @author <a href="mailto:shabanovd@gmail.com">Dmitriy Shabanov</a>
*/
public class PairGet extends BasicFunction {
private static final QName NAME = new QName("get-value", NAMESPACE_URI, PREFIX);
private static final QName NAME_URL = new QName("get-value-by-url", NAMESPACE_URI, PREFIX);
private static final String DESCRIPTION = "Get document value by key.";
private static final String DESCRIPTION_UUID = "Get document value by UUID.";
private static final FunctionReturnSequenceType RETURN = new FunctionReturnSequenceType(Type.ITEM, Cardinality.ZERO_OR_ONE, "Value.");
public final static FunctionSignature signatures[] = {
new FunctionSignature(
NAME,
DESCRIPTION,
new SequenceType[] {
new FunctionParameterSequenceType("document", Type.ITEM, Cardinality.EXACTLY_ONE, "The document."),
new FunctionParameterSequenceType("key", Type.STRING, Cardinality.EXACTLY_ONE, "The key."),
},
RETURN
),
new FunctionSignature(
NAME,
DESCRIPTION_UUID,
new SequenceType[] {
new FunctionParameterSequenceType("uuid", Type.STRING, Cardinality.EXACTLY_ONE, "The key/value pair uuid."),
},
RETURN
),
new FunctionSignature(
NAME_URL,
DESCRIPTION,
new SequenceType[] {
new FunctionParameterSequenceType("document", Type.STRING, Cardinality.EXACTLY_ONE, "The document's URL."),
new FunctionParameterSequenceType("key", Type.STRING, Cardinality.EXACTLY_ONE, "The key."),
},
RETURN
)
};
/**
* @param context
*/
public PairGet(XQueryContext context, FunctionSignature signature) {
super(context, signature);
}
/* (non-Javadoc)
* @see org.exist.xquery.BasicFunction#eval(org.exist.xquery.value.Sequence[], org.exist.xquery.value.Sequence)
*/
public Sequence eval(Sequence[] args, Sequence contextSequence) throws XPathException {
Metas metas = null;
Meta meta = null;
if (getSignature().getName().equals(NAME))
if (args.length == 1) {
meta = MetaData.get().getMeta(args[0].getStringValue());
} else {
if (args[0] instanceof DocumentImpl) {
metas = MetaData.get().getMetas(((DocumentImpl)args[0]));
} else
throw new XPathException(this, "Unsupported type "+args[0].getItemType());
}
else if (getSignature().getName().equals(NAME_URL))
metas = MetaData.get().getMetas(XmldbURI.create(args[0].getStringValue()));
if (metas == null && meta == null)
throw new XPathException(this, "No metadata found.");
if (meta == null)
meta = metas.get(args[1].getStringValue());
if (meta == null)
return Sequence.EMPTY_SEQUENCE;
ValueSequence returnSeq = new ValueSequence();
if (meta.getValue() instanceof DocumentImpl) {
returnSeq.add( new NodeProxy( (DocumentImpl) meta.getValue() ) );
} else {
returnSeq.add(new StringValue(meta.getValue().toString()));
}
return returnSeq;
}
}