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/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Eclipse Public License, Version 1.0 (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.eclipse.org/org/documents/epl-v10.php
*
* 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.android.ide.eclipse.adt.internal.editors.ui.tree;
import com.android.ide.eclipse.adt.internal.editors.descriptors.ElementDescriptor;
import com.android.ide.eclipse.adt.internal.editors.uimodel.UiElementNode;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.Viewer;
import java.util.ArrayList;
/**
* UiModelTreeContentProvider is a trivial implementation of {@link ITreeContentProvider}
* where elements are expected to be instances of {@link UiElementNode}.
*/
class UiModelTreeContentProvider implements ITreeContentProvider {
/** The descriptor of the elements to be displayed as root in this tree view. All elements
* of the same type in the root will be displayed. */
private ElementDescriptor[] mDescriptorFilters;
/** The uiRootNode of the model. */
private final UiElementNode mUiRootNode;
public UiModelTreeContentProvider(UiElementNode uiRootNode,
ElementDescriptor[] descriptorFilters) {
mUiRootNode = uiRootNode;
mDescriptorFilters = descriptorFilters;
}
/* (non-java doc)
* Returns all the UI node children of the given element or null if not the right kind
* of object. */
@Override
public Object[] getChildren(Object parentElement) {
if (parentElement instanceof UiElementNode) {
UiElementNode node = (UiElementNode) parentElement;
return node.getUiChildren().toArray();
}
return null;
}
/* (non-java doc)
* Returns the parent of a given UI node or null if it's a root node or it's not the
* right kind of node. */
@Override
public Object getParent(Object element) {
if (element instanceof UiElementNode) {
UiElementNode node = (UiElementNode) element;
return node.getUiParent();
}
return null;
}
/* (non-java doc)
* Returns true if the UI node has any UI children nodes. */
@Override
public boolean hasChildren(Object element) {
if (element instanceof UiElementNode) {
UiElementNode node = (UiElementNode) element;
return node.getUiChildren().size() > 0;
}
return false;
}
/* (non-java doc)
* Get root elements for the tree. These are all the UI nodes that
* match the filter descriptor in the current root node.
* <p/>
* Although not documented, it seems this method should not return null.
* At worse, it should return new Object[0].
* <p/>
* inputElement is not currently used. The root node and the filter are given
* by the enclosing class.
*/
@Override
public Object[] getElements(Object inputElement) {
ArrayList<UiElementNode> roots = new ArrayList<UiElementNode>();
if (mUiRootNode != null) {
for (UiElementNode ui_node : mUiRootNode.getUiChildren()) {
if (mDescriptorFilters == null || mDescriptorFilters.length == 0) {
roots.add(ui_node);
} else {
for (ElementDescriptor filter : mDescriptorFilters) {
if (ui_node.getDescriptor() == filter) {
roots.add(ui_node);
}
}
}
}
}
return roots.toArray();
}
@Override
public void dispose() {
// pass
}
@Override
public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
// pass
}
}
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