org.waveprotocol.wave.model.raw.RawFragmentFactory.java Source code

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Here is the source code for org.waveprotocol.wave.model.raw.RawFragmentFactory.java

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/**
 * 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.waveprotocol.wave.model.raw;

import com.google.common.collect.ImmutableList;

import org.waveprotocol.box.server.persistence.blocks.Interval;
import org.waveprotocol.box.server.persistence.blocks.ReadableSegmentSnapshot;
import org.waveprotocol.box.server.persistence.blocks.SegmentOperation;
import org.waveprotocol.box.server.persistence.blocks.VersionNode;

import org.waveprotocol.wave.model.id.SegmentId;
import org.waveprotocol.wave.model.util.CollectionUtils;
import org.waveprotocol.wave.model.util.Preconditions;

import java.util.List;

/**
 *
 * @author akaplanov@gmail.com (A. Kaplanov)
 */
public class RawFragmentFactory {

    public static RawFragment makeRawFragment(SegmentId segmentId, Interval interval, boolean makeSnapshot) {
        RawSnapshot rawSnapshot = null;
        List<SegmentOperation> adjustOperations = CollectionUtils.newLinkedList();
        List<SegmentOperation> diffOperations = CollectionUtils.newLinkedList();
        if (makeSnapshot) {
            if (interval.getRange().from() == interval.getRange().to() && interval.getLastSnapshot() != null) {
                rawSnapshot = interval.getLastSnapshot().getRawSnapshot();
            } else {
                VersionNode nearestSnapshotNode = interval.getNearestSnapshotNode(interval.getRange().from());
                if (nearestSnapshotNode != null) {
                    rawSnapshot = nearestSnapshotNode.getSegmentSnapshot().getRawSnapshot();
                    if (nearestSnapshotNode.getVersion() != interval.getRange().from()) {
                        adjustOperations.addAll(
                                interval.getHistory(nearestSnapshotNode.getVersion(), interval.getRange().from()));
                    }
                } else {
                    ReadableSegmentSnapshot snapshot = interval.getSnapshot(interval.getRange().from());
                    Preconditions.checkNotNull(snapshot, "Can't get snapshot of version "
                            + interval.getRange().from() + " of segment " + segmentId.toString());
                    rawSnapshot = snapshot.getRawSnapshot();
                }
            }
        }
        if (interval.getRange().from() != interval.getRange().to()) {
            diffOperations.addAll(interval.getHistory(interval.getRange().from(), interval.getRange().to()));
        }
        RawFragment rawFragment = new RawFragment(rawSnapshot, toRawOperations(adjustOperations),
                toRawOperations(diffOperations));
        return rawFragment;
    }

    private static ImmutableList<RawOperation> toRawOperations(List<SegmentOperation> operations) {
        ImmutableList.Builder<RawOperation> rawOperations = ImmutableList.builder();
        for (SegmentOperation segmentOperation : operations) {
            rawOperations.add(segmentOperation.getRawOperation());
        }
        return rawOperations.build();
    }
}