/**
 * Copyright (C) 2010 Orbeon, Inc.
 *
 * 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
 * 2.1 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.
 *
 * The full text of the license is available at http://www.gnu.org/copyleft/lesser.html
 */
package org.orbeon.oxf.transformer.xupdate.statement;

import org.orbeon.dom4j.QName;
import org.orbeon.jaxen.NamespaceContext;
import org.orbeon.jaxen.UnresolvableException;
import org.orbeon.oxf.common.ValidationException;
import org.orbeon.oxf.transformer.xupdate.DocumentContext;
import org.orbeon.oxf.transformer.xupdate.Statement;
import org.orbeon.oxf.transformer.xupdate.VariableContextImpl;
import org.orbeon.oxf.xml.dom4j.LocationData;

import javax.xml.transform.URIResolver;
import java.util.Collections;

public class Assign extends Statement {

    private QName qname;
    private String select;
    private NamespaceContext namespaceContext;
    private Statement[] statements;

    public Assign(LocationData locationData, QName qname, String select, NamespaceContext namespaceContext, Statement[] statements) {
        super(locationData);
        this.qname = qname;
        this.select = select;
        this.namespaceContext = namespaceContext;
        this.statements = statements;
    }

    public Object execute(URIResolver uriResolver, Object context, VariableContextImpl variableContext, DocumentContext documentContext) {
        try {
            Object newValue = select != null
                ? Utils.evaluate(uriResolver, context, variableContext, documentContext, getLocationData(), select, namespaceContext)
                : Utils.execute(uriResolver, context, variableContext, documentContext, statements);
            variableContext.assign(qname, newValue);
            return Collections.EMPTY_LIST;
        } catch (UnresolvableException e) {
            throw new ValidationException(e, getLocationData());
        }
    }

    public QName getName() {
        return qname;
    }
}