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

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Here is the source code for com.facebook.buck.android.AppModularityMetadataUtil.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.filesystem.ProjectFilesystem;
import com.google.common.collect.ImmutableMap;
import java.io.IOException;
import java.nio.file.Path;
import java.util.Iterator;
import java.util.List;

public class AppModularityMetadataUtil {

    public static ImmutableMap<String, String> getClassToModuleMap(ProjectFilesystem filesystem, Path metadataFile)
            throws IOException {
        ImmutableMap.Builder<String, String> builder = ImmutableMap.builder();

        List<String> metadataLines = filesystem.readLines(metadataFile);
        Iterator<String> lineIterator = metadataLines.iterator();

        // find classes header
        while (true) {
            if (!lineIterator.hasNext()) {
                // failed to hit class header
                return builder.build();
            }
            String headerCheck = lineIterator.next();
            if (headerCheck.equals(WriteAppModuleMetadataStep.CLASS_SECTION_HEADER)) {
                break;
            }
        }

        boolean inClassCheck = false;
        String currentModule = "";

        while (lineIterator.hasNext()) {
            String line = lineIterator.next();
            if (inClassCheck) {
                // check to see if the line is a class.
                if (line.startsWith(WriteAppModuleMetadataStep.ITEM_INDENTATION)) {
                    String className = line.trim();
                    // add the pair to the map.
                    builder.put(className, currentModule);
                } else {
                    // otherwise we are done with the current module.
                    // and a module check is necessary.
                    inClassCheck = false;
                }
            }
            if (!inClassCheck) {
                // if the module check fails we are done with class metadata
                if (!line.startsWith(WriteAppModuleMetadataStep.MODULE_INDENTATION)) {
                    break;
                }
                // otherwise need to check classes for the new module.
                currentModule = line.trim();
                inClassCheck = true;
            }
        }
        return builder.build();
    }
}