gerrit.PRED_commit_edits_2.java Source code

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Here is the source code for gerrit.PRED_commit_edits_2.java

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// Copyright (C) 2011 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 gerrit;

import com.google.gerrit.rules.StoredValues;
import com.google.gerrit.server.patch.PatchList;
import com.google.gerrit.server.patch.PatchListEntry;
import com.google.gerrit.server.patch.Text;

import com.googlecode.prolog_cafe.exceptions.IllegalTypeException;
import com.googlecode.prolog_cafe.exceptions.JavaException;
import com.googlecode.prolog_cafe.exceptions.PInstantiationException;
import com.googlecode.prolog_cafe.exceptions.PrologException;
import com.googlecode.prolog_cafe.lang.Operation;
import com.googlecode.prolog_cafe.lang.Predicate;
import com.googlecode.prolog_cafe.lang.Prolog;
import com.googlecode.prolog_cafe.lang.SymbolTerm;
import com.googlecode.prolog_cafe.lang.Term;
import com.googlecode.prolog_cafe.lang.VariableTerm;

import org.eclipse.jgit.diff.Edit;
import org.eclipse.jgit.errors.CorruptObjectException;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevTree;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.treewalk.TreeWalk;

import java.io.IOException;
import java.util.List;
import java.util.regex.Pattern;

/**
 * Returns true if any of the files that match FileNameRegex have edited lines
 * that match EditRegex
 *
 * <pre>
 *   'commit_edits'(+FileNameRegex, +EditRegex)
 * </pre>
 */
public class PRED_commit_edits_2 extends Predicate.P2 {
    public PRED_commit_edits_2(Term a1, Term a2, Operation n) {
        arg1 = a1;
        arg2 = a2;
        cont = n;
    }

    @Override
    public Operation exec(Prolog engine) throws PrologException {
        engine.setB0();

        Term a1 = arg1.dereference();
        Term a2 = arg2.dereference();

        Pattern fileRegex = getRegexParameter(a1);
        Pattern editRegex = getRegexParameter(a2);

        PatchList pl = StoredValues.PATCH_LIST.get(engine);
        Repository repo = StoredValues.REPOSITORY.get(engine);

        try (ObjectReader reader = repo.newObjectReader(); RevWalk rw = new RevWalk(reader)) {
            final RevTree aTree;
            final RevTree bTree;
            final RevCommit bCommit = rw.parseCommit(pl.getNewId());

            if (pl.getOldId() != null) {
                aTree = rw.parseTree(pl.getOldId());
            } else {
                // Octopus merge with unknown automatic merge result, since the
                // web UI returns no files to match against, just fail.
                return engine.fail();
            }
            bTree = bCommit.getTree();

            for (PatchListEntry entry : pl.getPatches()) {
                String newName = entry.getNewName();
                String oldName = entry.getOldName();

                if (newName.equals("/COMMIT_MSG")) {
                    continue;
                }

                if (fileRegex.matcher(newName).find() || (oldName != null && fileRegex.matcher(oldName).find())) {
                    List<Edit> edits = entry.getEdits();

                    if (edits.isEmpty()) {
                        continue;
                    }
                    Text tA;
                    if (oldName != null) {
                        tA = load(aTree, oldName, reader);
                    } else {
                        tA = load(aTree, newName, reader);
                    }
                    Text tB = load(bTree, newName, reader);
                    for (Edit edit : edits) {
                        if (tA != Text.EMPTY) {
                            String aDiff = tA.getString(edit.getBeginA(), edit.getEndA(), true);
                            if (editRegex.matcher(aDiff).find()) {
                                return cont;
                            }
                        }
                        if (tB != Text.EMPTY) {
                            String bDiff = tB.getString(edit.getBeginB(), edit.getEndB(), true);
                            if (editRegex.matcher(bDiff).find()) {
                                return cont;
                            }
                        }
                    }
                }
            }
        } catch (IOException err) {
            throw new JavaException(this, 1, err);
        }

        return engine.fail();
    }

    private Pattern getRegexParameter(Term term) {
        if (term instanceof VariableTerm) {
            throw new PInstantiationException(this, 1);
        }
        if (!(term instanceof SymbolTerm)) {
            throw new IllegalTypeException(this, 1, "symbol", term);
        }
        return Pattern.compile(term.name(), Pattern.MULTILINE);
    }

    private Text load(final ObjectId tree, final String path, final ObjectReader reader)
            throws MissingObjectException, IncorrectObjectTypeException, CorruptObjectException, IOException {
        if (path == null) {
            return Text.EMPTY;
        }
        final TreeWalk tw = TreeWalk.forPath(reader, path, tree);
        if (tw == null) {
            return Text.EMPTY;
        }
        if (tw.getFileMode(0).getObjectType() != Constants.OBJ_BLOB) {
            return Text.EMPTY;
        }
        return new Text(reader.open(tw.getObjectId(0), Constants.OBJ_BLOB));
    }
}