/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
package org.apache.jackrabbit.webdav.version.report;

import org.apache.jackrabbit.webdav.property.AbstractDavProperty;
import org.apache.jackrabbit.webdav.version.DeltaVConstants;
import org.apache.jackrabbit.webdav.xml.DomUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

import java.util.HashSet;
import java.util.Set;

/**
 * <code>SupportedReportSetProperty</code> represents the DAV:supported-report-set
 * property defined by RFC 3253. It identifies the reports that are supported by
 * the given resource.
 * <pre>
 * <!ELEMENT supported-report-set (supported-report*)>
 * <!ELEMENT supported-report report>
 * <!ELEMENT report ANY>
 * ANY value: a report element type
 * </pre>
 */
public class SupportedReportSetProperty extends AbstractDavProperty<Set<ReportType>> {

    private static Logger log = LoggerFactory.getLogger(SupportedReportSetProperty.class);

    private final Set<ReportType> reportTypes = new HashSet<ReportType>();

    /**
     * Create a new empty <code>SupportedReportSetProperty</code>.
     */
    public SupportedReportSetProperty() {
        super(DeltaVConstants.SUPPORTED_REPORT_SET, true);
    }

    /**
     * Create a new <code>SupportedReportSetProperty</code> property.
     *
     * @param reportTypes that are supported by the resource having this property.
     */
    public SupportedReportSetProperty(ReportType[] reportTypes) {
        super(DeltaVConstants.SUPPORTED_REPORT_SET, true);
        for (ReportType reportType : reportTypes) {
            addReportType(reportType);
        }
    }

    /**
     * Add an additional report type to this property's value.
     *
     * @param reportType
     */
    public void addReportType(ReportType reportType) {
        reportTypes.add(reportType);
    }

    /**
     * Returns true if the report type indicated in the specified <code>RequestInfo</code>
     * object is included in the supported reports.
     *
     * @param reqInfo
     * @return true if the requested report is supported.
     */
    public boolean isSupportedReport(ReportInfo reqInfo) {
        for (ReportType reportType : reportTypes) {
            if (reportType.isRequestedReportType(reqInfo)) {
                return true;
            }
        }
        return false;
    }

    /**
     * Returns a set of report types.
     *
     * @return set of {@link ReportType}.
     * @see org.apache.jackrabbit.webdav.property.DavProperty#getValue()
     */
    public Set<ReportType> getValue() {
        return reportTypes;
    }

    /**
     * Returns the Xml representation of this property.
     *
     * @return Xml representation listing all supported reports
     * @see org.apache.jackrabbit.webdav.xml.XmlSerializable#toXml(Document)
     * @param document
     */
    @Override
    public Element toXml(Document document) {
        Element elem = getName().toXml(document);
        for (ReportType rt : reportTypes) {
            Element sr = DomUtil.addChildElement(elem, DeltaVConstants.XML_SUPPORTED_REPORT, DeltaVConstants.NAMESPACE);
            Element r = DomUtil.addChildElement(sr, DeltaVConstants.XML_REPORT, DeltaVConstants.NAMESPACE);
            r.appendChild(rt.toXml(document));
        }
        return elem;
    }

}