Examples with ManyToMany org.apache.openejb.jee.jpa.ManyToMany used on opensource projects

Example 1 with ManyToMany

use of org.apache.openejb.jee.jpa.ManyToMany in project tomee by apache.

the class CmpJpaConversion method processRelationship.

private void processRelationship(final Map<String, Entity> entitiesByEjbName, final EjbRelation relation) throws OpenEJBException {
    final List<EjbRelationshipRole> roles = relation.getEjbRelationshipRole();
    // if we don't have two roles, the relation is bad so we skip it
    if (roles.size() != 2) {
        return;
    }
    // get left entity
    final EjbRelationshipRole leftRole = roles.get(0);
    final RelationshipRoleSource leftRoleSource = leftRole.getRelationshipRoleSource();
    final String leftEjbName = leftRoleSource == null ? null : leftRoleSource.getEjbName();
    final Entity leftEntity = entitiesByEjbName.get(leftEjbName);
    // get right entity
    final EjbRelationshipRole rightRole = roles.get(1);
    final RelationshipRoleSource rightRoleSource = rightRole.getRelationshipRoleSource();
    final String rightEjbName = rightRoleSource == null ? null : rightRoleSource.getEjbName();
    final Entity rightEntity = entitiesByEjbName.get(rightEjbName);
    // neither left or right have a mapping which is fine
    if (leftEntity == null && rightEntity == null) {
        return;
    }
    // left not found?
    if (leftEntity == null) {
        throw new OpenEJBException("Role source " + leftEjbName + " defined in relationship role " + relation.getEjbRelationName() + "::" + leftRole.getEjbRelationshipRoleName() + " not found");
    }
    // right not found?
    if (rightEntity == null) {
        throw new OpenEJBException("Role source " + rightEjbName + " defined in relationship role " + relation.getEjbRelationName() + "::" + rightRole.getEjbRelationshipRoleName() + " not found");
    }
    final Attributes rightAttributes = rightEntity.getAttributes();
    final Map<String, RelationField> rightRelationships = rightAttributes.getRelationshipFieldMap();
    final Attributes leftAttributes = leftEntity.getAttributes();
    final Map<String, RelationField> leftRelationships = leftAttributes.getRelationshipFieldMap();
    String leftFieldName = null;
    boolean leftSynthetic = false;
    if (leftRole.getCmrField() != null) {
        leftFieldName = leftRole.getCmrField().getCmrFieldName();
    } else {
        leftFieldName = rightEntity.getName() + "_" + rightRole.getCmrField().getCmrFieldName();
        leftSynthetic = true;
    }
    final boolean leftIsOne = leftRole.getMultiplicity() == Multiplicity.ONE;
    String rightFieldName = null;
    boolean rightSynthetic = false;
    if (rightRole.getCmrField() != null) {
        rightFieldName = rightRole.getCmrField().getCmrFieldName();
    } else {
        rightFieldName = leftEntity.getName() + "_" + leftRole.getCmrField().getCmrFieldName();
        rightSynthetic = true;
    }
    final boolean rightIsOne = rightRole.getMultiplicity() == Multiplicity.ONE;
    if (leftIsOne && rightIsOne) {
        // 
        // one-to-one
        // 
        // left
        OneToOne leftOneToOne = null;
        leftOneToOne = new OneToOne();
        leftOneToOne.setName(leftFieldName);
        leftOneToOne.setSyntheticField(leftSynthetic);
        setCascade(rightRole, leftOneToOne);
        addRelationship(leftOneToOne, leftRelationships, leftAttributes.getOneToOne());
        // right
        OneToOne rightOneToOne = null;
        rightOneToOne = new OneToOne();
        rightOneToOne.setName(rightFieldName);
        rightOneToOne.setSyntheticField(rightSynthetic);
        rightOneToOne.setMappedBy(leftFieldName);
        setCascade(leftRole, rightOneToOne);
        addRelationship(rightOneToOne, rightRelationships, rightAttributes.getOneToOne());
        // link
        leftOneToOne.setRelatedField(rightOneToOne);
        rightOneToOne.setRelatedField(leftOneToOne);
    } else if (leftIsOne && !rightIsOne) {
        // 
        // one-to-many
        // 
        // left
        OneToMany leftOneToMany = null;
        leftOneToMany = new OneToMany();
        leftOneToMany.setName(leftFieldName);
        leftOneToMany.setSyntheticField(leftSynthetic);
        leftOneToMany.setMappedBy(rightFieldName);
        setCascade(rightRole, leftOneToMany);
        addRelationship(leftOneToMany, leftRelationships, leftAttributes.getOneToMany());
        // right
        ManyToOne rightManyToOne = null;
        rightManyToOne = new ManyToOne();
        rightManyToOne.setName(rightFieldName);
        rightManyToOne.setSyntheticField(rightSynthetic);
        setCascade(leftRole, rightManyToOne);
        addRelationship(rightManyToOne, rightRelationships, rightAttributes.getManyToOne());
        // link
        leftOneToMany.setRelatedField(rightManyToOne);
        rightManyToOne.setRelatedField(leftOneToMany);
    } else if (!leftIsOne && rightIsOne) {
        // 
        // many-to-one
        // 
        // left
        ManyToOne leftManyToOne = null;
        leftManyToOne = new ManyToOne();
        leftManyToOne.setName(leftFieldName);
        leftManyToOne.setSyntheticField(leftSynthetic);
        setCascade(rightRole, leftManyToOne);
        addRelationship(leftManyToOne, leftRelationships, leftAttributes.getManyToOne());
        // right
        OneToMany rightOneToMany = null;
        rightOneToMany = new OneToMany();
        rightOneToMany.setName(rightFieldName);
        rightOneToMany.setSyntheticField(rightSynthetic);
        rightOneToMany.setMappedBy(leftFieldName);
        setCascade(leftRole, rightOneToMany);
        addRelationship(rightOneToMany, rightRelationships, rightAttributes.getOneToMany());
        // link
        leftManyToOne.setRelatedField(rightOneToMany);
        rightOneToMany.setRelatedField(leftManyToOne);
    } else if (!leftIsOne && !rightIsOne) {
        // 
        // many-to-many
        // 
        // left
        ManyToMany leftManyToMany = null;
        leftManyToMany = new ManyToMany();
        leftManyToMany.setName(leftFieldName);
        leftManyToMany.setSyntheticField(leftSynthetic);
        setCascade(rightRole, leftManyToMany);
        addRelationship(leftManyToMany, leftRelationships, leftAttributes.getManyToMany());
        // right
        ManyToMany rightManyToMany = null;
        rightManyToMany = new ManyToMany();
        rightManyToMany.setName(rightFieldName);
        rightManyToMany.setSyntheticField(rightSynthetic);
        rightManyToMany.setMappedBy(leftFieldName);
        setCascade(leftRole, rightManyToMany);
        addRelationship(rightManyToMany, rightRelationships, rightAttributes.getManyToMany());
        // link
        leftManyToMany.setRelatedField(rightManyToMany);
        rightManyToMany.setRelatedField(leftManyToMany);
    }
}