com.facebook.buck.rules.CellPathResolverSerializer.java Source code

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Here is the source code for com.facebook.buck.rules.CellPathResolverSerializer.java

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/*
 * Copyright 2016-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.rules;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;

import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Map;

public class CellPathResolverSerializer {

    private static final String TYPE = "type";
    private static final String TYPE_DEFAULT = "default";
    private static final String ROOT_PATH = "root_path";
    private static final String CELL_PATHS = "cell_paths";

    private CellPathResolverSerializer() {
    }

    public static ImmutableMap<String, Object> serialize(CellPathResolver resolver) {
        Preconditions.checkArgument(resolver instanceof DefaultCellPathResolver,
                "Unsupported CellPathResolver class: %s", resolver.getClass());

        DefaultCellPathResolver defaultResolver = (DefaultCellPathResolver) resolver;

        ImmutableMap.Builder<String, Object> builder = ImmutableMap.builder();
        builder.put(TYPE, TYPE_DEFAULT);
        builder.put(ROOT_PATH, defaultResolver.getRoot().toString());

        ImmutableMap.Builder<String, String> cellPathAsStrings = ImmutableMap.builder();
        for (Map.Entry<String, Path> entry : defaultResolver.getCellPaths().entrySet()) {
            cellPathAsStrings.put(entry.getKey(), entry.getValue().toString());
        }
        builder.put(CELL_PATHS, cellPathAsStrings.build());
        return builder.build();
    }

    @SuppressWarnings("unchecked")
    public static CellPathResolver deserialize(Map<String, Object> data) {
        String type = (String) data.get(TYPE);
        Preconditions.checkNotNull(type, "Expected to have value for key %s", TYPE);
        Preconditions.checkArgument(type.equals(TYPE_DEFAULT),
                "Only CellPathResolver with type '%s' are supported, but found '%s' type", TYPE_DEFAULT, type);

        String rootPathAsString = (String) data.get(ROOT_PATH);
        Preconditions.checkNotNull(rootPathAsString, "Expected to have value for key %s", ROOT_PATH);
        Path rootPath = Paths.get(rootPathAsString);

        Map<String, String> cellPathsAsStrings = (Map<String, String>) data.get(CELL_PATHS);
        Preconditions.checkNotNull(cellPathsAsStrings, "Expected to have value for key %s", CELL_PATHS);

        ImmutableMap.Builder<String, Path> cellPaths = ImmutableMap.builder();
        for (Map.Entry<String, String> entry : cellPathsAsStrings.entrySet()) {
            cellPaths.put(entry.getKey(), Paths.get(entry.getValue()));
        }

        return new DefaultCellPathResolver(rootPath, cellPaths.build());
    }
}