com.facebook.buck.util.ProcessExecutorSerializer.java Source code

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Here is the source code for com.facebook.buck.util.ProcessExecutorSerializer.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.util;

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

import java.util.Map;

public class ProcessExecutorSerializer {

    private static final String TYPE = "type";
    private static final String TYPE_DEFAULT = "default";
    private static final String TYPE_CONTEXTUAL = "contextual";
    private static final String CONTEXT = "context";
    private static final String DELEGATE = "delegate";

    private ProcessExecutorSerializer() {
    }

    public static ImmutableMap<String, Object> serialize(ProcessExecutor executor) {
        ImmutableMap.Builder<String, Object> builder = ImmutableMap.builder();
        if (executor instanceof DefaultProcessExecutor) {
            builder.put(TYPE, TYPE_DEFAULT);
        } else if (executor instanceof ContextualProcessExecutor) {
            builder.put(TYPE, TYPE_CONTEXTUAL);
            ContextualProcessExecutor contextualProcessExecutor = (ContextualProcessExecutor) executor;
            builder.put(CONTEXT, contextualProcessExecutor.getContext());
            builder.put(DELEGATE, serialize(contextualProcessExecutor.getDelegate()));
        } else {
            throw new RuntimeException(
                    String.format("Cannot serialize ProcessExecutor with class %s", executor.getClass()));
        }
        return builder.build();
    }

    @SuppressWarnings("unchecked")
    public static ProcessExecutor deserialize(Map<String, Object> data, Console console) {
        String type = (String) data.get(TYPE);
        Preconditions.checkNotNull(type, "Cannot deserialize without `%s` field", TYPE);
        if (type.equals(TYPE_DEFAULT)) {
            return new DefaultProcessExecutor(console);
        } else if (type.equals(TYPE_CONTEXTUAL)) {
            Map<String, Object> delegateData = (Map<String, Object>) data.get(DELEGATE);
            Preconditions.checkNotNull(delegateData,
                    "Expected to find serialized data for delegate of the ContextualProcessExecutor");
            Map<String, String> context = (Map<String, String>) data.get(CONTEXT);
            Preconditions.checkNotNull(context, "Expected to find context for ContextualProcessExecutor");
            return new ContextualProcessExecutor(deserialize(delegateData, console), ImmutableMap.copyOf(context));
        } else {
            throw new RuntimeException(String.format("Cannot serialize ProcessExecutor with type %s", type));
        }
    }
}