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

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Here is the source code for org.waveprotocol.wave.model.raw.RawOperation.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 org.waveprotocol.wave.model.operation.wave.WaveletOperationContext;
import org.waveprotocol.wave.model.operation.wave.WaveletOperation;
import org.waveprotocol.wave.model.id.SegmentId;
import org.waveprotocol.wave.model.util.Preconditions;
import org.waveprotocol.wave.communication.Blob;

import com.google.common.collect.ImmutableList;

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

    public interface Serializer {
        public interface Writer {
            void setOperations(ImmutableList<? extends WaveletOperation> operations);
        }

        Blob serializeOperation(RawOperation operation);

        void deserializeOperation(Blob serialized, SegmentId segmentId, WaveletOperationContext context,
                RawOperation.Serializer.Writer writer);
    };

    private final Serializer serializer;
    private Blob serialized;
    private boolean worthy;
    private final WaveletOperationContext context;
    private final SegmentId segmentId;

    private ImmutableList<? extends WaveletOperation> operations;

    public RawOperation(Serializer serializer, Blob serialized, SegmentId segmentId,
            WaveletOperationContext context) {
        this.serializer = serializer;
        this.serialized = serialized;
        this.segmentId = segmentId;
        this.context = context;
    }

    public RawOperation(Serializer serializer, ImmutableList<? extends WaveletOperation> operations,
            WaveletOperationContext context) {
        Preconditions.checkArgument(!operations.isEmpty(), "No operations");
        this.serializer = serializer;
        this.segmentId = null;
        this.context = context;
        this.operations = operations;
        this.worthy = isWorthy(operations);
    }

    public WaveletOperationContext getContext() {
        return context;
    }

    public boolean isWorthy() {
        deserialize();
        return isWorthy(operations);
    }

    public ImmutableList<? extends WaveletOperation> getOperations() throws RawParseException {
        deserialize();
        return operations;
    }

    public Blob serialize() {
        if (serialized == null) {
            serialized = serializer.serializeOperation(this);
        }
        return serialized;
    }

    @Override
    public String toString() {
        deserialize();
        StringBuilder sb = new StringBuilder();
        if (operations != null) {
            for (int i = 0; i < operations.size(); i++) {
                if (i != 0) {
                    sb.append("\n");
                }
                sb.append(operations.get(i).toString());
            }
        }
        return sb.toString();
    }

    private synchronized void deserialize() {
        if (operations == null) {
            serializer.deserializeOperation(serialized, segmentId, context, new Serializer.Writer() {

                @Override
                public void setOperations(ImmutableList<? extends WaveletOperation> operations) {
                    RawOperation.this.operations = operations;
                }
            });
        }
    }

    private static boolean isWorthy(ImmutableList<? extends WaveletOperation> operations) {
        for (WaveletOperation op : operations) {
            if (op.isWorthyOfAttribution()) {
                return true;
            }
        }
        return false;
    }
}