/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-09 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
*
* $Id$
*/
package org.exist.xquery.modules.cache;
import org.apache.log4j.Logger;
import org.exist.dom.QName;
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.FunctionParameterSequenceType;
import org.exist.xquery.value.Item;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.SequenceType;
import org.exist.xquery.value.Type;
import org.xml.sax.SAXException;
/**
* Global cache. Put function
*
* @author Evgeny Gazdovsky <gazdovsky@gmail.com>
* @version 1.0
*/
public class PutFunction extends CacheBasicFunction {
private final static Logger logger = Logger.getLogger(PutFunction.class);
public final static FunctionSignature signatures[] = {
new FunctionSignature(
new QName("put", CacheModule.NAMESPACE_URI, CacheModule.PREFIX),
"Put data with a key into the identified cache. Returns the previous value associated with the key",
new SequenceType[] {
new FunctionParameterSequenceType("cache-value", Type.ITEM, Cardinality.ONE, "Either the Java cache object or the name of the cache"),
new FunctionParameterSequenceType("key", Type.ANY_TYPE, Cardinality.ONE_OR_MORE, "The key to the object within the cache"),
new FunctionParameterSequenceType("value", Type.ANY_TYPE, Cardinality.ZERO_OR_MORE, "The object to store within the cache")
},
new FunctionParameterSequenceType("previous-value", Type.ANY_TYPE, Cardinality.ZERO_OR_MORE, "the previous value associated with the key")
)
};
public PutFunction(XQueryContext context, FunctionSignature signature) {
super(context, signature);
}
public Sequence eval(Sequence[] args, Sequence contextSequence) throws XPathException {
Item item = args[0].itemAt(0);
Sequence value = args[2];
try {
String key = serialize(args[1]);
if (item.getType()==Type.STRING){
if( logger.isTraceEnabled() ) {
logger.trace("putting cache value [" + item.getStringValue() + ", " + key +"]");
}
return Cache.put(item.getStringValue(), key, value);
} else {
if( logger.isTraceEnabled() ) {
logger.trace("putting cache value [" + item.toJavaObject(Cache.class).toString() + ", " + key +"]");
}
return ((Cache)item.toJavaObject(Cache.class)).put(key, value);
}
} catch (SAXException e) {
logger.error("Error putting cache value", e);
}
return Sequence.EMPTY_SEQUENCE;
}
}