com.google.devtools.depan.resource_doc.eclipse.ui.widgets.ResourceContainerAdapter.java Source code

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Here is the source code for com.google.devtools.depan.resource_doc.eclipse.ui.widgets.ResourceContainerAdapter.java

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/*
 * Copyright 2017 The Depan Project Authors
 *
 * 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.google.devtools.depan.resource_doc.eclipse.ui.widgets;

import com.google.devtools.depan.platform.PlatformResources;
import com.google.devtools.depan.resources.ResourceContainer;

import com.google.common.collect.Lists;

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.ui.model.IWorkbenchAdapter;

import java.util.Collection;
import java.util.List;

/**
 * Adapts a {@link ResourceContainer()} to a {@link IWorkbenchAdapter}.
 * 
 * Orders children as other containers first, then documents.
 * 
 * @author <a href="leeca@pnambic.com">Lee Carver</a>
 */
class ResourceContainerAdapter implements IWorkbenchAdapter {

    @Override
    public Object[] getChildren(Object element) {
        if (element instanceof ResourceContainer) {
            return buildDescendants((ResourceContainer) element);
        }
        return new Object[] {};
    }

    @Override
    public ImageDescriptor getImageDescriptor(Object element) {
        if (element instanceof ResourceContainer) {
            return PlatformResources.IMAGE_DESC_LIBRARY_OBJ;
        }
        return null;
    }

    @Override
    public String getLabel(Object element) {
        if (element instanceof ResourceContainer) {
            return ((ResourceContainer) element).getLabel();
        }
        return element.toString();
    }

    @Override
    public Object getParent(Object element) {
        if (element instanceof ResourceContainer) {
            return ((ResourceContainer) element).getParent();
        }
        return null;
    }

    /**
     * Build the list of descendants from both children and resources.
     */
    private Object[] buildDescendants(ResourceContainer rsrcCntr) {
        Collection<ResourceContainer> children = rsrcCntr.getChildren();
        Collection<Object> resources = rsrcCntr.getResources();
        int size = children.size() + resources.size();
        List<Object> result = Lists.newArrayListWithExpectedSize(size);
        result.addAll(children);
        result.addAll(resources);
        return result.toArray();
    }
}