com.facebook.buck.android.ReplaceManifestPlaceholdersStep.java Source code

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Here is the source code for com.facebook.buck.android.ReplaceManifestPlaceholdersStep.java

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/*
 * Copyright 2012-present Facebook, 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.facebook.buck.android;

import com.facebook.buck.io.ProjectFilesystem;
import com.facebook.buck.step.ExecutionContext;
import com.facebook.buck.step.Step;
import com.facebook.buck.step.StepExecutionResult;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Iterables;

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Replaces placeholders in the android manifest.
 */
public class ReplaceManifestPlaceholdersStep implements Step {

    private final ProjectFilesystem projectFilesystem;
    private final Path androidManifest;
    private final Path replacedManifest;
    private final ImmutableMap<String, String> manifestEntries;

    public ReplaceManifestPlaceholdersStep(ProjectFilesystem projectFilesystem, Path androidManifest,
            Path replacedManifest, ImmutableMap<String, String> manifestEntries) {
        this.projectFilesystem = projectFilesystem;
        this.androidManifest = androidManifest;
        this.replacedManifest = replacedManifest;
        this.manifestEntries = manifestEntries;
    }

    @Override
    public StepExecutionResult execute(ExecutionContext context) throws InterruptedException {
        try {
            String content = new String(Files.readAllBytes(projectFilesystem.resolve(androidManifest)),
                    StandardCharsets.UTF_8);
            String replaced = replacePlaceholders(content, manifestEntries);
            projectFilesystem.writeContentsToPath(replaced, replacedManifest);
        } catch (IOException e) {
            context.logError(e, "Could not replace manifest placeholders.");
            return StepExecutionResult.ERROR;
        }
        return StepExecutionResult.SUCCESS;
    }

    @Override
    public String getShortName() {
        return "replace_manifest_placeholders";
    }

    @Override
    public String getDescription(ExecutionContext context) {
        return String.format("%s: %s -> %s", getShortName(), androidManifest, replacedManifest);
    }

    @VisibleForTesting
    static String replacePlaceholders(String content, ImmutableMap<String, String> placeholders) {
        Iterable<String> escaped = Iterables.transform(placeholders.keySet(), Pattern::quote);

        Joiner joiner = Joiner.on("|");
        String patternString = Pattern.quote("${") + "(" + joiner.join(escaped) + ")" + Pattern.quote("}");
        Pattern pattern = Pattern.compile(patternString);
        Matcher matcher = pattern.matcher(content);

        StringBuffer sb = new StringBuffer();
        while (matcher.find()) {
            matcher.appendReplacement(sb, placeholders.get(matcher.group(1)));
        }
        matcher.appendTail(sb);
        return sb.toString();
    }
}