FetchV2Request.java

/*
 * Copyright (C) 2018, Google LLC. and others
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0 which is available at
 * https://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */
package org.eclipse.jgit.transport;

import static java.util.Objects.requireNonNull;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.eclipse.jgit.annotations.NonNull;
import org.eclipse.jgit.annotations.Nullable;
import org.eclipse.jgit.lib.ObjectId;

/**
 * Fetch request from git protocol v2.
 *
 * <p>
 * This is used as an input to {@link ProtocolV2Hook}.
 *
 * @since 5.1
 */
public final class FetchV2Request extends FetchRequest {
    private final List<ObjectId> peerHas;

    private final List<String> wantedRefs;

    private final boolean doneReceived;

    @NonNull
    private final List<String> serverOptions;

    private final boolean sidebandAll;

    @NonNull
    private final List<String> packfileUriProtocols;

    FetchV2Request(@NonNull List<ObjectId> peerHas,
            @NonNull List<String> wantedRefs,
            @NonNull Set<ObjectId> wantIds,
            @NonNull Set<ObjectId> clientShallowCommits, int deepenSince,
            @NonNull List<String> deepenNotRefs, int depth,
            @NonNull FilterSpec filterSpec,
            boolean doneReceived, @NonNull Set<String> clientCapabilities,
            @Nullable String agent, @NonNull List<String> serverOptions,
            boolean sidebandAll, @NonNull List<String> packfileUriProtocols) {
        super(wantIds, depth, clientShallowCommits, filterSpec,
                clientCapabilities, deepenSince,
                deepenNotRefs, agent);
        this.peerHas = requireNonNull(peerHas);
        this.wantedRefs = requireNonNull(wantedRefs);
        this.doneReceived = doneReceived;
        this.serverOptions = requireNonNull(serverOptions);
        this.sidebandAll = sidebandAll;
        this.packfileUriProtocols = packfileUriProtocols;
    }

    /**
     * @return object ids received in the "have" lines
     */
    @NonNull
    List<ObjectId> getPeerHas() {
        return peerHas;
    }

    /**
     * @return list of references received in "want-ref" lines
     *
     * @since 5.4
     */
    @NonNull
    public List<String> getWantedRefs() {
        return wantedRefs;
    }

    /**
     * @return true if the request had a "done" line
     */
    boolean wasDoneReceived() {
        return doneReceived;
    }

    /**
     * Options received in server-option lines. The caller can choose to act on
     * these in an application-specific way
     *
     * @return Immutable list of server options received in the request
     *
     * @since 5.2
     */
    @NonNull
    public List<String> getServerOptions() {
        return serverOptions;
    }

    /**
     * @return true if "sideband-all" was received
     */
    boolean getSidebandAll() {
        return sidebandAll;
    }

    @NonNull
    List<String> getPackfileUriProtocols() {
        return packfileUriProtocols;
    }

    /** @return A builder of {@link FetchV2Request}. */
    static Builder builder() {
        return new Builder();
    }

    /** A builder for {@link FetchV2Request}. */
    static final class Builder {
        final List<ObjectId> peerHas = new ArrayList<>();

        final List<String> wantedRefs = new ArrayList<>();

        final Set<ObjectId> wantIds = new HashSet<>();

        final Set<ObjectId> clientShallowCommits = new HashSet<>();

        final List<String> deepenNotRefs = new ArrayList<>();

        final Set<String> clientCapabilities = new HashSet<>();

        int depth;

        int deepenSince;

        FilterSpec filterSpec = FilterSpec.NO_FILTER;

        boolean doneReceived;

        @Nullable
        String agent;

        final List<String> serverOptions = new ArrayList<>();

        boolean sidebandAll;

        final List<String> packfileUriProtocols = new ArrayList<>();

        private Builder() {
        }

        /**
         * @param objectId
         *            object id received in a "have" line
         * @return this builder
         */
        Builder addPeerHas(ObjectId objectId) {
            peerHas.add(objectId);
            return this;
        }

        /**
         * Ref received in "want-ref" line and the object-id it refers to
         *
         * @param refName
         *            reference name
         * @return this builder
         */
        Builder addWantedRef(String refName) {
            wantedRefs.add(refName);
            return this;
        }

        /**
         * @param clientCapability
         *            capability line sent by the client
         * @return this builder
         */
        Builder addClientCapability(String clientCapability) {
            clientCapabilities.add(clientCapability);
            return this;
        }

        /**
         * @param wantId
         *            object id received in a "want" line
         * @return this builder
         */
        Builder addWantId(ObjectId wantId) {
            wantIds.add(wantId);
            return this;
        }

        /**
         * @param shallowOid
         *            object id received in a "shallow" line
         * @return this builder
         */
        Builder addClientShallowCommit(ObjectId shallowOid) {
            clientShallowCommits.add(shallowOid);
            return this;
        }

        /**
         * @param d
         *            Depth received in a "deepen" line
         * @return this builder
         */
        Builder setDepth(int d) {
            depth = d;
            return this;
        }

        /**
         * @return depth set in the request (via a "deepen" line). Defaulting to
         *         0 if not set.
         */
        int getDepth() {
            return depth;
        }

        /**
         * @return true if there has been at least one "deepen not" line in the
         *         request so far
         */
        boolean hasDeepenNotRefs() {
            return !deepenNotRefs.isEmpty();
        }

        /**
         * @param deepenNotRef
         *            reference received in a "deepen not" line
         * @return this builder
         */
        Builder addDeepenNotRef(String deepenNotRef) {
            deepenNotRefs.add(deepenNotRef);
            return this;
        }

        /**
         * @param value
         *            Unix timestamp received in a "deepen since" line
         * @return this builder
         */
        Builder setDeepenSince(int value) {
            deepenSince = value;
            return this;
        }

        /**
         * @return shallow since value, sent before in a "deepen since" line. 0
         *         by default.
         */
        int getDeepenSince() {
            return deepenSince;
        }

        /**
         * @param filter
         *            spec set in a "filter" line
         * @return this builder
         */
        Builder setFilterSpec(@NonNull FilterSpec filter) {
            filterSpec = requireNonNull(filter);
            return this;
        }

        /**
         * Mark that the "done" line has been received.
         *
         * @return this builder
         */
        Builder setDoneReceived() {
            doneReceived = true;
            return this;
        }

        /**
         * Value of an agent line received after the command and before the
         * arguments. E.g. "agent=a.b.c/1.0" should set "a.b.c/1.0".
         *
         * @param agentValue
         *            the client-supplied agent capability, without the leading
         *            "agent="
         * @return this builder
         */
        Builder setAgent(@Nullable String agentValue) {
            agent = agentValue;
            return this;
        }

        /**
         * Records an application-specific option supplied in a server-option
         * line, for later retrieval with
         * {@link FetchV2Request#getServerOptions}.
         *
         * @param value
         *            the client-supplied server-option capability, without
         *            leading "server-option=".
         * @return this builder
         */
        Builder addServerOption(@NonNull String value) {
            serverOptions.add(value);
            return this;
        }

        /**
         * @param value true if client sent "sideband-all"
         * @return this builder
         */
        Builder setSidebandAll(boolean value) {
            sidebandAll = value;
            return this;
        }

        Builder addPackfileUriProtocol(@NonNull String value) {
            packfileUriProtocols.add(value);
            return this;
        }

        /**
         * @return Initialized fetch request
         */
        FetchV2Request build() {
            return new FetchV2Request(peerHas, wantedRefs, wantIds,
                    clientShallowCommits, deepenSince, deepenNotRefs,
                    depth, filterSpec, doneReceived, clientCapabilities,
                    agent, Collections.unmodifiableList(serverOptions),
                    sidebandAll,
                    Collections.unmodifiableList(packfileUriProtocols));
        }
    }
}