com.google.devtools.moe.client.dvcs.hg.HgWriterCreator.java Source code

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Here is the source code for com.google.devtools.moe.client.dvcs.hg.HgWriterCreator.java

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/*
 * Copyright (c) 2011 Google, Inc.
 *
 * 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.
 */

package com.google.devtools.moe.client.dvcs.hg;

import com.google.common.base.Supplier;
import com.google.common.collect.ImmutableSet;
import com.google.devtools.moe.client.Utils;
import com.google.devtools.moe.client.repositories.Revision;
import com.google.devtools.moe.client.writer.Writer;
import com.google.devtools.moe.client.writer.WriterCreator;

import java.util.Map;

/**
 * An Hg implementation of WriterCreator, which modifies a local {@link HgClonedRepository}.
 */
public class HgWriterCreator implements WriterCreator {

    private final Supplier<HgClonedRepository> freshCloneSupplier;
    private final HgRevisionHistory revHistory;

    HgWriterCreator(Supplier<HgClonedRepository> freshCloneSupplier, HgRevisionHistory revHistory) {
        this.freshCloneSupplier = freshCloneSupplier;
        this.revHistory = revHistory;
    }

    @Override
    public Writer create(Map<String, String> options) {
        Utils.checkKeys(options, ImmutableSet.of("revision"));
        // Sanity check: make sure the given revision exists.
        Revision rev = revHistory.findHighestRevision(options.get("revision"));
        HgClonedRepository freshClone = freshCloneSupplier.get();
        freshClone.updateToRevision(rev.revId());
        return new HgWriter(freshClone);
    }
}