com.google.devtools.moe.client.tools.CodebaseDiffer.java Source code

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Here is the source code for com.google.devtools.moe.client.tools.CodebaseDiffer.java

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/*
 * Copyright (c) 2015 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.tools;

import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Sets;
import com.google.devtools.moe.client.codebase.Codebase;
import com.google.devtools.moe.client.tools.FileDifference.FileDiffer;

import java.util.Set;

import javax.inject.Inject;

/** Performs a difference analysis using an underlying {@code FileDiffer}. */
public class CodebaseDiffer {
    private final FileDiffer differ;

    @Inject
    public CodebaseDiffer(FileDiffer differ) {
        this.differ = differ;
    }

    /**
     * Diff two {@link Codebase} instances with a {@link FileDiffer}.
     */
    public CodebaseDifference diffCodebases(Codebase codebase1, Codebase codebase2) {
        Set<String> filenames = Sets.union(codebase1.getRelativeFilenames(), codebase2.getRelativeFilenames());

        ImmutableSet.Builder<FileDifference> fileDiffs = ImmutableSet.builder();

        for (String filename : filenames) {
            FileDifference fileDiff = differ.diffFiles(filename, codebase1.getFile(filename),
                    codebase2.getFile(filename));
            if (fileDiff.isDifferent()) {
                fileDiffs.add(fileDiff);
            }
        }

        return new CodebaseDifference(codebase1, codebase2, fileDiffs.build());
    }
}