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    • com.gwtplatform.dispatch.rest.delegates.client.AbstractResourceDelegate Maven / Gradle / Ivy

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    /**
 * Copyright 2014 ArcBees 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.gwtplatform.dispatch.rest.delegates.client;

import com.google.gwt.user.client.rpc.AsyncCallback;
import com.gwtplatform.dispatch.client.DelegatingDispatchRequest;
import com.gwtplatform.dispatch.rest.client.RestDispatch;
import com.gwtplatform.dispatch.rest.shared.RestAction;
import com.gwtplatform.dispatch.shared.DispatchRequest;

/**
 * Common code used by generated implementations of {@link ResourceDelegate}.
 *
 * @param  The resource used by this delegate.
 */
public abstract class AbstractResourceDelegate implements ResourceDelegate, Cloneable {
    private static final AsyncCallback NO_OP_CALLBACK = new AsyncCallback() {
        @Override
        public void onFailure(Throwable caught) {
        }

        @Override
        public void onSuccess(Object result) {
        }
    };

    protected final RestDispatch dispatcher;

    protected AsyncCallback callback;
    protected DelegatingDispatchRequest delegatingDispatchRequest;

    protected AbstractResourceDelegate(RestDispatch dispatcher) {
        this.dispatcher = dispatcher;
    }

    @Override
    public ResourceDelegate withDelegatingDispatchRequest(DelegatingDispatchRequest delegatingDispatchRequest) {
        AbstractResourceDelegate delegate = createCopy();
        delegate.delegatingDispatchRequest = delegatingDispatchRequest;

        return delegate;
    }

    @Override
    public T withoutCallback() {
        return withCallback(NO_OP_CALLBACK);
    }

    @Override
    public T withCallback(AsyncCallback callback) {
        AbstractResourceDelegate delegate = createCopy();
        delegate.callback = callback;

        return delegate.asResource();
    }

    @SuppressWarnings({"unchecked"})
    protected  void execute(RestAction action) {
        DispatchRequest dispatchRequest = dispatcher.execute(action, (AsyncCallback) callback);

        if (delegatingDispatchRequest != null) {
            delegatingDispatchRequest.setDelegate(dispatchRequest);
        }
    }

    protected void copyFields(AbstractResourceDelegate delegate) {
        delegate.delegatingDispatchRequest = delegatingDispatchRequest;
        delegate.callback = callback;
    }

    protected abstract AbstractResourceDelegate newInstance();

    protected abstract T asResource();

    private AbstractResourceDelegate createCopy() {
        AbstractResourceDelegate delegate = newInstance();
        copyFields(delegate);

        return delegate;
    }
}
    
    
    
    

    




    
    
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