org.obiba.opal.web.gwt.app.client.presenter.ResourceRequestPresenter.java Source code

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Here is the source code for org.obiba.opal.web.gwt.app.client.presenter.ResourceRequestPresenter.java

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/*******************************************************************************
 * Copyright 2008(c) The OBiBa Consortium. All rights reserved.
 *
 * This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
package org.obiba.opal.web.gwt.app.client.presenter;

import org.obiba.opal.web.gwt.rest.client.ResourceRequestBuilder;
import org.obiba.opal.web.gwt.rest.client.ResponseCodeCallback;
import org.obiba.opal.web.model.client.ws.ClientErrorDto;

import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.core.client.JsonUtils;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.web.bindery.event.shared.EventBus;
import com.google.web.bindery.event.shared.HandlerRegistration;
import com.google.gwt.http.client.Request;
import com.google.gwt.http.client.Response;
import com.google.inject.Inject;
import com.gwtplatform.mvp.client.PresenterWidget;
import com.gwtplatform.mvp.client.View;

/**
 *
 */
public class ResourceRequestPresenter<T extends JavaScriptObject>
        extends PresenterWidget<ResourceRequestPresenter.Display> {
    //
    // Instance Variables
    //

    private final ResourceRequestBuilder<T> requestBuilder;

    private final ResponseCodeCallback callback;

    //
    // Constructors
    //

    @Inject
    public ResourceRequestPresenter(Display display, EventBus eventBus, ResourceRequestBuilder<T> requestBuilder,
            ResponseCodeCallback callback) {
        super(eventBus, display);

        this.requestBuilder = requestBuilder;
        this.callback = callback;
    }

    //
    // Methods
    //

    public void setSuccessCodes(Integer... codes) {
        ResponseCodeCallback internalCallback = new ResponseCodeCallback() {

            @Override
            public void onResponseCode(Request request, Response response) {
                getView().completed();

                if (callback != null) {
                    callback.onResponseCode(request, response);
                }
            }
        };

        if (codes != null) {
            for (int code : codes) {
                requestBuilder.withCallback(code, internalCallback);
            }
        }
    }

    public void setErrorCodes(Integer... codes) {
        ResponseCodeCallback internalCallback = new ResponseCodeCallback() {

            @Override
            public void onResponseCode(Request request, Response response) {
                getView().failed();

                if (response.getText() != null && response.getText().length() != 0) {
                    try {
                        ClientErrorDto errorDto = JsonUtils.unsafeEval(response.getText());
                        getView().showErrorMessage(errorDto.getStatus());
                    } catch (Exception e) {
                        // Should never get here!
                        getView().showErrorMessage("Internal Error");
                    }
                } else {
                    getView().showErrorMessage("Unknown Error");
                }

                if (callback != null) {
                    callback.onResponseCode(request, response);
                }
            }
        };

        if (codes != null) {
            for (int code : codes) {
                requestBuilder.withCallback(code, internalCallback);
            }
        }
    }

    public void sendRequest() {
        getView().inProgress();
        requestBuilder.send();
    }

    //
    // Inner Classes / Interfaces
    //

    public interface Display extends View {

        void setResourceName(String resourceName);

        void showErrorMessage(String status);

        HandlerRegistration setResourceClickHandler(ResourceClickHandler handler);

        void inProgress();

        void completed();

        void failed();
    }

    public interface ResourceClickHandler extends ClickHandler {

        String getResourceLink();
    }
}