io.crnk.jpa.internal.JpaResourceFieldInformationProvider Maven / Gradle / Ivy

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JSON API framework for Java
There is a newer version: 2.6.20180522184741
package io.crnk.jpa.internal;

import javax.persistence.Column;
import javax.persistence.ElementCollection;
import javax.persistence.EmbeddedId;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Lob;
import javax.persistence.ManyToMany;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
import javax.persistence.Version;

import io.crnk.core.engine.information.bean.BeanAttributeInformation;
import io.crnk.core.engine.information.resource.ResourceFieldInformationProviderBase;
import io.crnk.core.engine.information.resource.ResourceFieldType;
import io.crnk.core.engine.internal.utils.StringUtils;
import io.crnk.core.resource.annotations.SerializeType;
import io.crnk.core.utils.Optional;

public class JpaResourceFieldInformationProvider extends ResourceFieldInformationProviderBase {


	@Override
	public Optional isSortable(BeanAttributeInformation attributeDesc) {
		Optional lob = attributeDesc.getAnnotation(Lob.class);
		if (lob.isPresent()) {
			return Optional.of(false);
		}
		return Optional.empty();
	}


	@Override
	public Optional isFilterable(BeanAttributeInformation attributeDesc) {
		Optional lob = attributeDesc.getAnnotation(Lob.class);
		if (lob.isPresent()) {
			return Optional.of(false);
		}
		return Optional.empty();
	}


	@Override
	public Optional isPostable(BeanAttributeInformation attributeDesc) {
		Optional column = attributeDesc.getAnnotation(Column.class);
		Optional version = attributeDesc.getAnnotation(Version.class);
		if (!version.isPresent() && column.isPresent()) {
			return Optional.of(column.get().insertable());
		}
		Optional generatedValue = attributeDesc.getAnnotation(GeneratedValue.class);
		if (generatedValue.isPresent()) {
			return Optional.of(false);
		}
		return Optional.empty();
	}

	@Override
	public Optional isPatchable(BeanAttributeInformation attributeDesc) {
		Optional column = attributeDesc.getAnnotation(Column.class);
		Optional version = attributeDesc.getAnnotation(Version.class);
		if (!version.isPresent() && column.isPresent()) {
			return Optional.of(column.get().updatable());
		}
		Optional generatedValue = attributeDesc.getAnnotation(GeneratedValue.class);
		if (generatedValue.isPresent()) {
			return Optional.of(false);
		}
		return Optional.empty();
	}

	@Override
	public Optional getFieldType(BeanAttributeInformation attributeDesc) {
		Optional oneToOne = attributeDesc.getAnnotation(OneToOne.class);
		Optional oneToMany = attributeDesc.getAnnotation(OneToMany.class);
		Optional manyToOne = attributeDesc.getAnnotation(ManyToOne.class);
		Optional manyToMany = attributeDesc.getAnnotation(ManyToMany.class);
		if (oneToOne.isPresent() || oneToMany.isPresent() || manyToOne.isPresent() || manyToMany.isPresent()) {
			return Optional.of(ResourceFieldType.RELATIONSHIP);
		}

		Optional id = attributeDesc.getAnnotation(Id.class);
		Optional embeddedId = attributeDesc.getAnnotation(EmbeddedId.class);
		if (id.isPresent() || embeddedId.isPresent()) {
			return Optional.of(ResourceFieldType.ID);
		}
		return Optional.empty();
	}


	@Override
	public Optional getOppositeName(BeanAttributeInformation attributeDesc) {
		Optional oneToMany = attributeDesc.getAnnotation(OneToMany.class);
		if (oneToMany.isPresent()) {
			return Optional.ofNullable(StringUtils.emptyToNull(oneToMany.get().mappedBy()));
		}
		Optional manyToMany = attributeDesc.getAnnotation(ManyToMany.class);
		if (manyToMany.isPresent()) {
			return Optional.ofNullable(StringUtils.emptyToNull(manyToMany.get().mappedBy()));
		}
		return Optional.empty();
	}


	@Override
	public Optional getSerializeType(BeanAttributeInformation attributeDesc) {
		Optional oneToMany = attributeDesc.getAnnotation(OneToMany.class);
		if (oneToMany.isPresent()) {
			return toSerializeType(oneToMany.get().fetch());
		}
		Optional manyToOne = attributeDesc.getAnnotation(ManyToOne.class);
		if (manyToOne.isPresent()) {
			return toSerializeType(manyToOne.get().fetch());
		}
		Optional manyToMany = attributeDesc.getAnnotation(ManyToMany.class);
		if (manyToMany.isPresent()) {
			return toSerializeType(manyToMany.get().fetch());
		}
		Optional elementCollection = attributeDesc.getAnnotation(ElementCollection.class);
		if (elementCollection.isPresent()) {
			return toSerializeType(elementCollection.get().fetch());
		}
		return Optional.empty();
	}

	private Optional toSerializeType(FetchType fetch) {
		return Optional.of(fetch == FetchType.EAGER ? SerializeType.ONLY_ID : SerializeType.LAZY);
	}
}