001/*
002 * (C) Copyright 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Nuxeo - initial API and implementation
018 *
019 * $Id: AbstractDocumentReader.java 30477 2008-02-22 10:02:15Z dmihalache $
020 */
021
022package org.nuxeo.ecm.core.io.impl;
023
024import java.io.IOException;
025import java.util.ArrayList;
026import java.util.List;
027
028import org.apache.commons.logging.Log;
029import org.apache.commons.logging.LogFactory;
030import org.nuxeo.ecm.core.io.DocumentReader;
031import org.nuxeo.ecm.core.io.ExportedDocument;
032
033/**
034 * @author <a href="mailto:[email protected]">Bogdan Stefanescu</a>
035 */
036public abstract class AbstractDocumentReader implements DocumentReader {
037
038    private static final Log log = LogFactory.getLog(AbstractDocumentReader.class);
039
040    // this abstract method is needed
041    @Override
042    public abstract ExportedDocument read() throws IOException;
043
044    @Override
045    public ExportedDocument[] read(int count) throws IOException {
046        List<ExportedDocument> docs = new ArrayList<ExportedDocument>(count);
047        for (int i = 0; i < count; i++) {
048            ExportedDocument doc = read();
049            if (doc == null) {
050                break;
051            }
052
053            /* NXP-1688 Rux: no ID, it should be a OS folder and not an exported one */
054            if (doc.getId() != null) {
055                if (log.isDebugEnabled()) {
056                    log.debug("Adding document to be transformed (path): " + doc.getPath());
057                }
058                docs.add(doc);
059            } else {
060                log.warn("no ID for document, won't add " + doc);
061            }
062        }
063        if (docs.isEmpty()) {
064            return null;
065        }
066        return docs.toArray(new ExportedDocument[docs.size()]);
067    }
068
069}