org.sakaiproject.nakamura.eventexplorer.ui.EventsWriter.java Source code

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Here is the source code for org.sakaiproject.nakamura.eventexplorer.ui.EventsWriter.java

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/**
 * Licensed to the Sakai Foundation (SF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The SF 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.sakaiproject.nakamura.eventexplorer.ui;

import org.apache.cassandra.thrift.Column;
import org.apache.cassandra.thrift.ColumnOrSuperColumn;
import org.apache.cassandra.thrift.ColumnParent;
import org.apache.cassandra.thrift.ConsistencyLevel;
import org.apache.cassandra.thrift.KeyRange;
import org.apache.cassandra.thrift.SlicePredicate;
import org.apache.cassandra.thrift.SliceRange;
import org.apache.cassandra.thrift.SuperColumn;
import org.apache.cassandra.thrift.Cassandra.Client;
import org.apache.commons.lang.time.FastDateFormat;
import org.json.JSONException;
import org.json.JSONWriter;

import java.util.GregorianCalendar;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;

/**
 *
 */
public class EventsWriter {

    private FastDateFormat format = FastDateFormat.getInstance("EEE, dd MMM yyyy HH:mm:ss Z", new Locale("en"));

    private Client client;

    public EventsWriter(Client client) {
        this.client = client;
    }

    /**
     * Writes all the stored data of a user.
     * @param userid
     * @param writer
     */
    public void writeUser(String userid, JSONWriter writer) {
        try {
            KeyRange keyRange = new KeyRange(3);
            keyRange.setStart_key("");
            keyRange.setEnd_key("");

            SliceRange sliceRange = new SliceRange();
            sliceRange.setStart(new byte[] {});
            sliceRange.setFinish(new byte[] {});
            sliceRange.setCount(10000);

            SlicePredicate predicate = new SlicePredicate();
            predicate.setSlice_range(sliceRange);

            ColumnParent parent = new ColumnParent("Users");

            List<ColumnOrSuperColumn> cols = client.get_slice("SAKAI", userid, parent, predicate,
                    ConsistencyLevel.ONE);

            for (ColumnOrSuperColumn colOrSuperCol : cols) {
                SuperColumn superColumn = colOrSuperCol.getSuper_column();
                writeSuperColumn(superColumn, writer);
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * @param superColumn
     * @param writer
     * @throws JSONException
     */
    private void writeSuperColumn(SuperColumn superColumn, JSONWriter writer) throws JSONException {
        GregorianCalendar cal = new GregorianCalendar();
        String time = new String(superColumn.getName());
        cal.setTimeInMillis(Long.parseLong(time));

        writer.object();
        writer.key("start").value(format.format(cal));
        Iterator<Column> columns = superColumn.getColumnsIterator();
        String topic = "";
        String path = "";
        while (columns.hasNext()) {
            Column col = columns.next();
            String colName = new String(col.getName());
            if (colName.equals("resourceType")) {
                colName = "title";
            }
            if (colName.equals("path")) {
                path = new String(col.getValue());
            }
            if (colName.equals("event.topics")) {
                topic = new String(col.getValue());
            }
            writer.key(colName);
            writer.value(new String(col.getValue()));
        }
        writer.key("description");
        writer.value(topic + "<br />\n" + path);
        writer.endObject();
    }
}