SingleDocumentReader.java

/*
 * (C) Copyright 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
 *
 * Licensed 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.
 *
 * Contributors:
 *     Nuxeo - initial API and implementation
 *
 * $Id: SingleDocumentReader.java 30256 2008-02-18 21:52:11Z tdelprat $
 */

package org.nuxeo.ecm.core.io.impl.plugins;

import java.io.IOException;

import org.nuxeo.ecm.core.api.CoreSession;
import org.nuxeo.ecm.core.api.DocumentModel;
import org.nuxeo.ecm.core.api.DocumentRef;
import org.nuxeo.ecm.core.io.ExportedDocument;
import org.nuxeo.ecm.core.io.impl.ExportedDocumentImpl;

/**
 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
 */
public class SingleDocumentReader extends DocumentModelReader {

    protected DocumentModel doc;

    protected boolean enableRepeatedReads = false;

    protected boolean readDone = false;

    public SingleDocumentReader(CoreSession session, DocumentModel root) {
        super(session);
        doc = root;
    }

    public SingleDocumentReader(CoreSession session, DocumentRef root) {
        this(session, session.getDocument(root));
    }

    @Override
    public void close() {
        super.close();
        session = null;
        doc = null;
    }

    @Override
    public ExportedDocument read() throws IOException {
        if (doc != null) {
            if (readDone && !enableRepeatedReads) {
                return null;
            } else {
                readDone = true;
                return new ExportedDocumentImpl(doc);
            }
        }
        doc = null;
        return null;
    }

    public void setEnableRepeatedReads(boolean enableRepeatedReads) {
        this.enableRepeatedReads = enableRepeatedReads;
    }

}