jetbrains.buildServer.buildTriggers.vcs.git.GitAbstractVcsFileContentProvider.java Source code

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Here is the source code for jetbrains.buildServer.buildTriggers.vcs.git.GitAbstractVcsFileContentProvider.java

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/*
 * Copyright 2000-2014 JetBrains s.r.o.
 *
 * 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 jetbrains.buildServer.buildTriggers.vcs.git;

import com.intellij.openapi.diagnostic.Logger;
import jetbrains.buildServer.vcs.*;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.revwalk.RevCommit;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

public abstract class GitAbstractVcsFileContentProvider implements VcsFileContentProvider {

    private static final Logger LOG = Logger.getInstance(GitAbstractVcsFileContentProvider.class.getName());
    protected final GitVcsSupport myVcs;

    public GitAbstractVcsFileContentProvider(@NotNull GitVcsSupport vcs) {
        myVcs = vcs;
    }

    @NotNull
    public byte[] getContent(@NotNull VcsModification vcsModification, @NotNull VcsChangeInfo change,
            @NotNull VcsChangeInfo.ContentType contentType, @NotNull VcsRoot vcsRoot) throws VcsException {
        String vcsChangeVersion = contentType == VcsChangeInfo.ContentType.BEFORE_CHANGE
                ? change.getBeforeChangeRevisionNumber()
                : change.getAfterChangeRevisionNumber();
        String version = null;
        if (!isValid(vcsChangeVersion)) {
            LOG.warn("Invalid version '" + vcsChangeVersion + "', try using version from VCS modification");
            switch (contentType) {
            case AFTER_CHANGE:
                version = vcsModification.getVersion();
                break;
            case BEFORE_CHANGE:
                version = getParentRevision(vcsRoot, vcsModification);
                break;
            default:
                throw new VcsException("Unknown contentType " + contentType);
            }
        } else {
            version = vcsChangeVersion;
        }

        if (!isValid(version)) {
            //give up if we failed to retrieve version from both change and modification
            LOG.warn("Invalid version " + vcsChangeVersion + ", change: " + change + ", modification version: "
                    + vcsModification.getVersion());
            throw new VcsException("Invalid version '" + vcsChangeVersion + "'");
        }

        String file = change.getRelativeFileName();
        return getContent(file, vcsRoot, version);
    }

    @Nullable
    private String getParentRevision(@NotNull VcsRoot root, @NotNull VcsModification m) throws VcsException {
        String version = m.getVersion();
        if (!isValid(version))
            return null;
        OperationContext context = myVcs.createContext(root, "compute parent revision of " + version);
        try {
            GitVcsRoot gitRoot = context.getGitRoot();
            RevCommit c = myVcs.getCommitLoader().loadCommit(context, gitRoot, version);
            if (c.getParents().length == 0)
                return null;
            return c.getParent(0).name();
        } catch (Exception e) {
            throw context.wrapException(e);
        } finally {
            context.close();
        }
    }

    private boolean isValid(@Nullable String version) {
        if (version == null)
            return false;
        try {
            ObjectId.fromString(version);
            return true;
        } catch (IllegalArgumentException e) {
            return false;
        }
    }
}