com.google.gerrit.server.change.Revisions.java Source code

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Here is the source code for com.google.gerrit.server.change.Revisions.java

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// Copyright (C) 2012 The Android Open Source Project
//
// 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.gerrit.server.change;

import com.google.common.collect.Lists;
import com.google.gerrit.extensions.registration.DynamicMap;
import com.google.gerrit.extensions.restapi.ChildCollection;
import com.google.gerrit.extensions.restapi.IdString;
import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
import com.google.gerrit.extensions.restapi.RestView;
import com.google.gerrit.reviewdb.client.Change;
import com.google.gerrit.reviewdb.client.PatchSet;
import com.google.gerrit.reviewdb.client.RevId;
import com.google.gerrit.reviewdb.server.ReviewDb;
import com.google.gwtorm.server.OrmException;
import com.google.inject.Inject;
import com.google.inject.Provider;

import java.util.Collections;
import java.util.List;

public class Revisions implements ChildCollection<ChangeResource, RevisionResource> {
    private final DynamicMap<RestView<RevisionResource>> views;
    private final Provider<ReviewDb> dbProvider;

    @Inject
    Revisions(DynamicMap<RestView<RevisionResource>> views, Provider<ReviewDb> dbProvider) {
        this.views = views;
        this.dbProvider = dbProvider;
    }

    @Override
    public DynamicMap<RestView<RevisionResource>> views() {
        return views;
    }

    @Override
    public RestView<ChangeResource> list() throws ResourceNotFoundException {
        throw new ResourceNotFoundException();
    }

    @Override
    public RevisionResource parse(ChangeResource change, IdString id)
            throws ResourceNotFoundException, OrmException {
        if (id.equals("current")) {
            PatchSet.Id p = change.getChange().currentPatchSetId();
            PatchSet ps = p != null ? dbProvider.get().patchSets().get(p) : null;
            if (ps != null && visible(change, ps)) {
                return new RevisionResource(change, ps);
            }
            throw new ResourceNotFoundException(id);
        }
        List<PatchSet> match = Lists.newArrayListWithExpectedSize(2);
        for (PatchSet ps : find(change, id.get())) {
            Change.Id changeId = ps.getId().getParentKey();
            if (changeId.equals(change.getChange().getId()) && visible(change, ps)) {
                match.add(ps);
            }
        }
        if (match.size() != 1) {
            throw new ResourceNotFoundException(id);
        }
        return new RevisionResource(change, match.get(0));
    }

    private boolean visible(ChangeResource change, PatchSet ps) throws OrmException {
        return change.getControl().isPatchVisible(ps, dbProvider.get());
    }

    private List<PatchSet> find(ChangeResource change, String id) throws OrmException {
        ReviewDb db = dbProvider.get();

        if (id.length() < 6 && id.matches("^[1-9][0-9]{0,4}$")) {
            // Legacy patch set number syntax.
            PatchSet ps = dbProvider.get().patchSets()
                    .get(new PatchSet.Id(change.getChange().getId(), Integer.parseInt(id)));
            if (ps != null) {
                return Collections.singletonList(ps);
            }
            return Collections.emptyList();
        } else if (id.length() < 4 || id.length() > RevId.LEN) {
            // Require a minimum of 4 digits.
            // Impossibly long identifier will never match.
            return Collections.emptyList();
        } else if (id.length() >= 8) {
            // Commit names are rather unique. Query for the commit and later
            // match to the change. This is most likely going to identify 1 or
            // at most 2 patch sets to consider, which is smaller than looking
            // for all patch sets in the change.
            RevId revid = new RevId(id);
            if (revid.isComplete()) {
                return db.patchSets().byRevision(revid).toList();
            } else {
                return db.patchSets().byRevisionRange(revid, revid.max()).toList();
            }
        } else {
            // Chance of collision rises; look at all patch sets on the change.
            List<PatchSet> out = Lists.newArrayList();
            for (PatchSet ps : db.patchSets().byChange(change.getChange().getId())) {
                if (ps.getRevision() != null && ps.getRevision().get().startsWith(id)) {
                    out.add(ps);
                }
            }
            return out;
        }
    }
}