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ViewContext.java
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ViewContext.java
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package org.genericsystem.reactor;
import java.util.HashMap;
import java.util.IdentityHashMap;
import java.util.Map;
import java.util.function.BiConsumer;
import org.genericsystem.reactor.Tag.HtmlDomNode;
/**
* @author Nicolas Feybesse
*
* @param <N>
*/
public class ViewContext<M extends Model> {
private ViewContext<?> parent;
private Tag<M> element;
private HtmlDomNode node;
private Model modelContext;
private ViewContext(int indexInChildren, Model modelContext, Tag<M> element, String rootId) {
init(null, modelContext, element, element.new HtmlDomNode(rootId));
node.sendAdd(0);
init(indexInChildren);
}
private ViewContext(int indexInChildren, ViewContext<?> parent, Model modelContext, Tag<M> element) {
init(parent, modelContext, element, element.createNode(parent.getNode().getId()));
init(indexInChildren);
}
private void init(ViewContext<?> parent, Model modelContext, Tag<M> element, HtmlDomNode node) {
this.parent = parent;
this.element = element;
assert node != null;
this.node = node;
this.modelContext = modelContext;
}
private void init(int indexInChildren) {
modelContext.register(this);
if (parent != null)
insertChild(indexInChildren);
for (BiConsumer<Model, Tag<M>.HtmlDomNode> binding : element.getPreFixedBindings())
binding.accept(modelContext, getNode());
for (Tag<?> childElement : element.getChildren())
if (childElement.getMetaBinding() != null)
childElement.getMetaBinding().accept(childElement, this);
else
createViewContextChild(null, modelContext, childElement);
for (BiConsumer<Model, Tag<M>.HtmlDomNode> binding : element.getPostFixedBindings())
binding.accept(modelContext, getNode());
}
@SuppressWarnings("unchecked")
public <MODEL extends Model> MODEL getModelContext() {
return (MODEL) modelContext;
}
public ViewContext<?> createViewContextChild(Integer index, Model childModelContext, Tag<?> element) {
int indexInChildren = computeIndex(index, element);
return new ViewContext<>(indexInChildren, this, childModelContext, element);
}
protected RootViewContext<?> getRootViewContext() {
return parent.getRootViewContext();
}
@SuppressWarnings({ "unchecked" })
public <NODE extends HtmlDomNode> NODE getNode() {
return (NODE) node;
}
private Map<Tag<?>, Integer> sizeBySubElement = new IdentityHashMap<Tag<?>, Integer>() {
private static final long serialVersionUID = 6725720602283055930L;
@Override
public Integer get(Object key) {
Integer size = super.get(key);
if (size == null)
put((Tag<?>) key, size = 0);
return size;
};
};
void insertChild(int index) {
parent.incrementSize(element);
node.sendAdd(index);
getRootViewContext().add(node.getId(), node);
}
private boolean destroyed = false;
void destroy() {
// System.out.println("Attempt to destroy : " + getNode().getId());
assert !destroyed : "Node : " + getNode().getId();
destroyed = true;
getRootViewContext().remove(node.getId());
parent.decrementSize(element);
}
private void incrementSize(Tag<?> child) {
sizeBySubElement.put(child, sizeBySubElement.get(child) + 1);
}
private void decrementSize(Tag<?> child) {
int size = sizeBySubElement.get(child) - 1;
assert size >= 0;
if (size == 0)
sizeBySubElement.remove(child);// remove map if empty
else
sizeBySubElement.put(child, size);
}
private int computeIndex(Integer nullable, Tag<?> childElement) {
int indexInChildren = nullable == null ? sizeBySubElement.get(childElement) : nullable;
for (Tag<?> child : element.getChildren()) {
if (child == childElement)
return indexInChildren;
indexInChildren += sizeBySubElement.get(child);
}
return indexInChildren;
}
public static class RootViewContext<M extends Model> extends ViewContext<M> {
private Map<String, HtmlDomNode> nodeById;
public RootViewContext(M rootModelContext, Tag<M> template, String rootId) {
super(0, rootModelContext, template, rootId);
}
@Override
protected RootViewContext<?> getRootViewContext() {
return this;
}
private Map<String, HtmlDomNode> getMap() {
return nodeById != null ? nodeById : (nodeById = new HashMap<>());
}
public HtmlDomNode getNodeById(String id) {
return getMap().get(id);
}
public void add(String id, HtmlDomNode domNode) {
getMap().put(id, domNode);
}
public void remove(String id) {
getMap().remove(id);
}
}
public Tag<M> getTag() {
return element;
}
}