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Contains classes to talk to the domain controller using the DMR protocol

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/*
 *  Copyright 2022 Red Hat
 *
 *  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
 *
 *      https://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.jboss.hal.dmr;

import org.jboss.hal.dmr.dispatch.Dispatcher;
import org.jboss.hal.flow.FlowContext;
import org.jboss.hal.flow.Task;

import elemental2.promise.Promise;

import static org.jboss.hal.dmr.ModelDescriptionConstants.READ_RESOURCE_OPERATION;

/**
 * Function which checks whether a given resource exists. Pushes {@code 200} onto the context stack if it exists, {@code 404}
 * otherwise.
 */
public final class ResourceCheck implements Task {

    private final Dispatcher dispatcher;
    private final ResourceAddress address;

    public ResourceCheck(Dispatcher dispatcher, ResourceAddress address) {
        this.dispatcher = dispatcher;
        this.address = address;
    }

    @Override
    public Promise apply(final FlowContext context) {
        Operation operation = new Operation.Builder(address, READ_RESOURCE_OPERATION).build();
        return dispatcher.execute(operation)
                .then(result -> context.resolve(200))
                .catch_(error -> context.resolve(404));
    }
}