org.prebake.channel.Commands.java Source code

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Here is the source code for org.prebake.channel.Commands.java

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// Copyright 2010, Mike Samuel
//
// 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 org.prebake.channel;

import org.prebake.js.JsonSerializable;
import org.prebake.js.JsonSink;
import org.prebake.js.JsonSource;

import com.google.common.collect.ImmutableList;

import java.io.IOException;
import java.io.OutputStream;
import java.nio.file.Path;
import java.util.Iterator;

import javax.annotation.Nullable;
import javax.annotation.ParametersAreNonnullByDefault;

/**
 * A bundle of commands from a single source.
 *
 * @author Mike Samuel <mikesamuel@gmail.com>
 */
@ParametersAreNonnullByDefault
public final class Commands implements Iterable<Command>, JsonSerializable {
    private final ImmutableList<Command> commands;
    private final @Nullable OutputStream response;

    private Commands(ImmutableList<Command> commands, @Nullable OutputStream response) {
        this.commands = commands;
        this.response = response;
    }

    public Iterator<Command> iterator() {
        return commands.iterator();
    }

    public OutputStream getResponse() {
        return response;
    }

    public static Commands fromJson(Path clientRoot, JsonSource src, @Nullable OutputStream response)
            throws IOException {
        ImmutableList.Builder<Command> cmds = ImmutableList.builder();
        src.expect("[");
        if (!src.check("]")) {
            do {
                cmds.add(Command.fromJson(src, clientRoot));
            } while (src.check(","));
            src.expect("]");
        }
        return new Commands(cmds.build(), response);
    }

    public static Commands valueOf(Iterable<Command> cmds, @Nullable OutputStream response) {
        return new Commands(ImmutableList.copyOf(cmds), response);
    }

    public void toJson(JsonSink out) throws IOException {
        out.write("[");
        Iterator<Command> it = commands.iterator();
        if (it.hasNext()) {
            it.next().toJson(out);
            while (it.hasNext()) {
                out.write(",");
                it.next().toJson(out);
            }
        }
        out.write("]");
    }
}