org.activiti.designer.eclipse.navigator.cloudrepo.ProcessModelContentProvider.java Source code

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Here is the source code for org.activiti.designer.eclipse.navigator.cloudrepo.ProcessModelContentProvider.java

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/* 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.activiti.designer.eclipse.navigator.cloudrepo;

import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.Viewer;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;

/**
 * @author jbarrez
 */
public class ProcessModelContentProvider implements ITreeContentProvider {

    private static final Object[] EMPTY_ARRAY = new Object[0];

    public static JsonNode modelsNode;

    public Object[] getChildren(Object parentElement) {
        if (parentElement instanceof ActivitiCloudEditorRoot) {
            if (modelsNode == null) {
                try {
                    initializeRootElements();
                } catch (final ActivitiCloudEditorException e) {
                    String detailMessage = null;
                    if (e.getExceptionNode() != null) {
                        detailMessage = e.getExceptionNode().get("message").asText();
                    } else {
                        detailMessage = e.getMessage();
                    }
                    // creating fake entry
                    ObjectMapper objectMapper = new ObjectMapper();
                    modelsNode = objectMapper.createObjectNode();
                    ArrayNode modelArrayNode = objectMapper.createArrayNode();
                    ((ObjectNode) modelsNode).put("data", modelArrayNode);
                    ObjectNode errorNode = objectMapper.createObjectNode();
                    modelArrayNode.add(errorNode);
                    errorNode.put("name", "Process models could not be retrieved: " + detailMessage);
                }
            }

            if (modelsNode != null) {
                ArrayNode modelArrayNode = (ArrayNode) modelsNode.get("data");
                Object[] objectArray = new Object[modelArrayNode.size()];
                for (int i = 0; i < modelArrayNode.size(); i++) {
                    JsonNode modelNode = modelArrayNode.get(i);
                    objectArray[i] = modelNode;
                }
                return objectArray;
            } else {
                return EMPTY_ARRAY;
            }

        } else {
            return EMPTY_ARRAY;
        }
    }

    public Object getParent(Object element) {
        return null;
    }

    public boolean hasChildren(Object element) {
        return (element instanceof ActivitiCloudEditorRoot);
    }

    public Object[] getElements(Object inputElement) {
        return getChildren(inputElement);
    }

    public void dispose() {
        modelsNode = null;
    }

    public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
    }

    private void initializeRootElements() {
        modelsNode = ActivitiCloudEditorUtil.getProcessModels(true);
    }

}