151 lines
4.3 KiB
Java
151 lines
4.3 KiB
Java
package org.gcube.informationsystem.resourceregistry.queries.json.base.relations;
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import org.gcube.com.fasterxml.jackson.databind.JsonNode;
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import org.gcube.informationsystem.base.reference.AccessType;
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import org.gcube.informationsystem.base.reference.Direction;
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import org.gcube.informationsystem.model.reference.relations.IsRelatedTo;
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import org.gcube.informationsystem.resourceregistry.api.exceptions.ResourceRegistryException;
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import org.gcube.informationsystem.resourceregistry.api.exceptions.queries.InvalidQueryException;
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import org.gcube.informationsystem.resourceregistry.api.exceptions.types.SchemaException;
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import org.gcube.informationsystem.resourceregistry.queries.json.base.entities.JsonQueryResource;
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/**
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* @author Luca Frosini (ISTI - CNR)
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*/
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public class JsonQueryIsRelatedTo extends JsonQueryRelation {
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protected String requestedResourceType;
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public JsonQueryIsRelatedTo(JsonNode jsonQuery) throws SchemaException, ResourceRegistryException {
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super(jsonQuery, AccessType.IS_RELATED_TO);
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}
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public String getRequestedResourceType() {
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return requestedResourceType;
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}
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public void setRequestedResourceType(String requestedResourceType) {
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this.requestedResourceType = requestedResourceType;
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}
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private StringBuffer traverseThisEdge(StringBuffer stringBuffer) throws InvalidQueryException {
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StringBuffer buffer = new StringBuffer();
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int size = jsonNode.size();
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// Remove @class from size
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--size;
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if(jsonNode.has(IsRelatedTo.SOURCE_PROPERTY)) {
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--size;
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}
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if(jsonNode.has(IsRelatedTo.TARGET_PROPERTY)) {
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--size;
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}
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if(size > 0) {
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buffer.append("SELECT FROM ");
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if(entryPoint) {
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buffer.append(type);
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}else {
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buffer.append(" ( "); // Open ( SELECT
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}
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}else {
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if(entryPoint) {
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buffer.append("SELECT FROM ");
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buffer.append(type);
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}
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}
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if(!entryPoint) {
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buffer.append("TRAVERSE ");
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buffer.append(direction.opposite().name().toLowerCase());
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buffer.append("E(\"");
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buffer.append(type);
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buffer.append("\") FROM ( ");
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buffer.append(stringBuffer);
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buffer.append(")");
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}
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stringBuffer = buffer;
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// Size 0 means that only '@class' and 'target'/'source' properties are present
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if(size > 0) {
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if(!entryPoint) {
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stringBuffer.append(" )"); // Close ) SELECT
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}
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stringBuffer.append(" WHERE ");
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stringBuffer.append(addConstraints(jsonNode, null, null));
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}
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return stringBuffer;
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}
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@Override
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public StringBuffer analize(StringBuffer stringBuffer) throws SchemaException, ResourceRegistryException {
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JsonNode sourceJsonNode = jsonNode.get(IsRelatedTo.SOURCE_PROPERTY);
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JsonNode targetJsonNode = jsonNode.get(IsRelatedTo.TARGET_PROPERTY);
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JsonNode resourceJsonNode = null;
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if(sourceJsonNode!=null) {
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resourceJsonNode = sourceJsonNode;
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direction = Direction.OUT;
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} else if(targetJsonNode!=null) {
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resourceJsonNode = targetJsonNode;
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direction = Direction.IN;
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}
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stringBuffer = traverseThisEdge(stringBuffer);
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JsonQueryResource jsonQueryResource = new JsonQueryResource(resourceJsonNode);
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jsonQueryResource.setDirection(direction);
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jsonQueryResource.setEntryPoint(false);
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stringBuffer = jsonQueryResource.analize(stringBuffer);
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StringBuffer buffer = new StringBuffer();
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if(requestedResourceType!=null) {
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buffer.append("TRAVERSE ");
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buffer.append(direction.opposite().name().toLowerCase());
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buffer.append("V(\"");
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buffer.append(requestedResourceType);
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buffer.append("\") FROM ( ");
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}
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buffer.append("TRAVERSE ");
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buffer.append(direction.name().toLowerCase());
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buffer.append("E(\"");
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buffer.append(type);
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buffer.append("\") FROM ( ");
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buffer.append(stringBuffer);
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buffer.append(")");
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if(requestedResourceType!=null) {
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buffer.append(")");
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}
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stringBuffer = buffer;
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if(sourceJsonNode!=null && targetJsonNode!=null) {
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// Target has still to be analised
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jsonQueryResource = new JsonQueryResource(targetJsonNode);
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jsonQueryResource.setDirection(Direction.IN);
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jsonQueryResource.setEntryPoint(false);
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stringBuffer = jsonQueryResource.analize(stringBuffer);
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boolean entryPointOldValue = entryPoint;
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// It is no more and entry point for the function traverseThisEdge
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entryPoint = false;
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stringBuffer = traverseThisEdge(stringBuffer);
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// Restoring entryPoint indication
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entryPoint = entryPointOldValue;
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}
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return stringBuffer;
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}
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}
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