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OData V2 adapter for CDS Services Java
There is a newer version: 3.6.0
/**************************************************************************
 * (C) 2019-2024 SAP SE or an SAP affiliate company. All rights reserved. *
 **************************************************************************/
package com.sap.cds.adapter.odata.v2.utils;

import java.util.List;
import java.util.Objects;

import org.apache.olingo.odata2.api.edm.EdmEntityType;
import org.apache.olingo.odata2.api.edm.EdmException;
import org.apache.olingo.odata2.api.edm.EdmProperty;
import org.apache.olingo.odata2.api.edm.EdmType;
import org.apache.olingo.odata2.api.uri.UriInfo;

import com.sap.cds.adapter.odata.v2.CdsRequestGlobals;
import com.sap.cds.adapter.odata.v2.processors.request.CdsODataRequest;
import com.sap.cds.services.ServiceException;
import com.sap.cds.services.utils.CdsErrorStatuses;
import com.sap.cds.services.utils.ErrorStatusException;

public class UriInfoUtils {

	private static final String PARAMETERS = "Parameters"; // suffix for parameter entity type
	private static final String TYPE = "Type"; // suffix for entity type of Set navigation
	private static final String SET = "Set"; // navigation property on Parameter entity type
	private final CdsRequestGlobals globals;

	public UriInfoUtils(CdsRequestGlobals globals) {
		this.globals = Objects.requireNonNull(globals, "globals");
	}

	public static EdmProperty getSimpleProperty(UriInfo uriInfo) {
		List propertyPath = uriInfo.getPropertyPath();
		if (!propertyPath.isEmpty()) {
			return propertyPath.get(propertyPath.size() - 1);
		}
		throw new ServiceException("No property path defined");
	}

	public static EdmProperty getSimpleProperty(CdsODataRequest cdsODataRequest) {
		return getSimpleProperty(cdsODataRequest.getUriInfo());
	}

	public String getTargetEntityName(UriInfo uriInfo) {
		try {
			return getCdsEntityName(uriInfo.getTargetEntitySet().getEntityType());
		} catch (EdmException e) {
			throw new ServiceException(e);
		}
	}

	private static String concat(String ns, String name) {
		return ns + "." + name;
	}


	public String getFullQualifiedName(EdmType entityType) {
		try {
			String namespace = entityType.getNamespace();
			String name = entityType.getName();

			String fqName = concat(namespace, name);
			String cdsName = globals.getCdsEntityNames().get(fqName);
			if (cdsName != null) {
				fqName = cdsName;
			}
			return fqName;
		} catch (EdmException e) {
			throw new ServiceException(e);
		}
	}


	public boolean isParametersEntityType(EdmEntityType entityType) {
		String name = getFullQualifiedName(entityType);
		// potential [CdsView]Parameters type
		if (name.endsWith(PARAMETERS)) {
			try {
				// has Set navigation
				if (entityType.getNavigationPropertyNames().contains(SET)) {
					String setName = getFullQualifiedName(entityType.getProperty(SET).getType());
					// Set type is named [CdsView]Type and both refer to the same [CdsView]
					if(setName.endsWith(TYPE) && name.startsWith(setName.substring(0, setName.length() - TYPE.length()))) {
						return true;
					}
				}
			} catch (EdmException e) {
				throw new ServiceException(e);
			}
		}
		return false;
	}

	public boolean isSetEntityType(EdmEntityType entityType) {
		String name = getFullQualifiedName(entityType);
		// potential [CdsView]Type type
		if (name.endsWith(TYPE)) {
			try {
				// has Parameters navigation
				if (entityType.getNavigationPropertyNames().contains(PARAMETERS)) {
					String paramName = getFullQualifiedName(entityType.getProperty(PARAMETERS).getType());
					// Parameters type is named [CdsView]Parameters and both refer to the same [CdsView]
					if(paramName.endsWith(PARAMETERS) && name.startsWith(paramName.substring(0, paramName.length() - PARAMETERS.length()))) {
						return true;
					}
				}
			} catch (EdmException e) {
				throw new ServiceException(e);
			}
		}
		return false;
	}

	public String getCdsEntityName(EdmEntityType entityType) {
		String name = getFullQualifiedName(entityType);
		if(isSetEntityType(entityType)) {
			return name.substring(0, name.length() - TYPE.length());
		} else if (isParametersEntityType(entityType)) {
			throw new ErrorStatusException(CdsErrorStatuses.INVALID_PARAMETERIZED_VIEW);
		} else {
			return name;
		}
	}

}