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JsonLdTreeBuilder.java
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JsonLdTreeBuilder.java
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/**
* Copyright (C) 2020 Czech Technical University in Prague
* <p>
* This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
* <p>
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 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 cz.cvut.kbss.jsonld.serialization;
import cz.cvut.kbss.jsonld.JsonLd;
import cz.cvut.kbss.jsonld.common.BeanAnnotationProcessor;
import cz.cvut.kbss.jsonld.serialization.model.CollectionNode;
import cz.cvut.kbss.jsonld.serialization.model.CompositeNode;
import cz.cvut.kbss.jsonld.serialization.model.JsonNode;
import cz.cvut.kbss.jsonld.serialization.traversal.InstanceVisitor;
import cz.cvut.kbss.jsonld.serialization.traversal.SerializationContext;
import java.util.Collection;
import java.util.Stack;
/**
* Builds an abstract representation of a JSON-LD tree, which is a result of object graph traversal by {@link
* cz.cvut.kbss.jsonld.serialization.traversal.ObjectGraphTraverser}.
*/
public class JsonLdTreeBuilder implements InstanceVisitor {
private final Stack<CompositeNode> nodeStack = new Stack<>();
private CompositeNode currentNode;
private final ValueSerializers serializers;
public JsonLdTreeBuilder(ValueSerializers serializers) {
this.serializers = serializers;
}
@Override
public void openObject(SerializationContext<?> ctx) {
final CompositeNode newCurrent =
ctx.getAttributeId() != null ? JsonNodeFactory.createObjectNode(ctx.getAttributeId()) :
JsonNodeFactory.createObjectNode();
openNewNode(newCurrent);
}
private void openNewNode(CompositeNode newNode) {
if (currentNode != null) {
if (currentNode.isOpen()) {
nodeStack.push(currentNode);
}
currentNode.addItem(newNode);
}
this.currentNode = newNode;
}
@Override
public void closeObject(SerializationContext<?> ctx) {
currentNode.close();
if (!nodeStack.empty()) {
this.currentNode = nodeStack.pop();
}
}
@Override
public void visitIdentifier(SerializationContext<String> idCtx) {
assert currentNode.isOpen();
currentNode.addItem(JsonNodeFactory.createObjectIdNode(JsonLd.ID, idCtx.getValue()));
}
@Override
public void visitTypes(SerializationContext<Collection<String>> typesCtx) {
final CollectionNode typesNode = JsonNodeFactory.createCollectionNode(JsonLd.TYPE, typesCtx.getValue());
typesCtx.getValue().forEach(type -> typesNode.addItem(JsonNodeFactory.createLiteralNode(type)));
currentNode.addItem(typesNode);
}
@Override
public void visitAttribute(SerializationContext<?> ctx) {
if (ctx.getValue() != null) {
assert currentNode != null;
final ValueSerializer serializer = serializers.getOrDefault(ctx);
final JsonNode node = serializer.serialize(ctx.getValue(), ctx);
if (node != null) {
currentNode.addItem(node);
}
}
}
@Override
public void openCollection(SerializationContext<? extends Collection<?>> ctx) {
final CollectionNode newCurrent =
ctx.getAttributeId() != null ? JsonNodeFactory.createCollectionNode(ctx.getAttributeId(),
ctx.getValue()) :
JsonNodeFactory.createCollectionNode(ctx.getValue());
openNewNode(newCurrent);
}
@Override
public void closeCollection(SerializationContext<?> ctx) {
assert currentNode instanceof CollectionNode;
closeObject(ctx);
}
public CompositeNode getTreeRoot() {
return currentNode;
}
}