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/*
* ConversionHelper.java
*
* Created on February 3, 2002, 12:34 PM
*/
package com.sun.jdo.api.persistence.mapping.ejb;
import java.util.List;
/** Helper interface for the {@link MappingFile}.
* The mapping file classes use an object that
* implements this interface to assist in the conversion
* from the sun-cmp-mapping file, into a TP dot-mapping file.
* The APIs to the deployment descriptors differ at deployment time
* and at development time. This interface provides a level of abstraction
* for the needed information.
*
* @author vkraemer
* @version 1.0
*/
public interface ConversionHelper {
public static final String ONE = "One"; // NOI18N
public static final String MANY = "Many"; // NOI18N
/** Computes the name of the TP implementation class for a bean.
* @param beanName The value of the ejb-name element for a bean.
* @return The full name of the TP class that implements
* the fields and relationships of an EJB.
*/
public String getMappedClassName(String beanName);
/**
* @param beanName Name of bean to investigate for field.
* @param fieldName Name of field sought in named bean.
* @return True if the named bean has the named field
*/
public boolean hasField(String beanName, String fieldName);
/**
*/
public Object[] getFields(String beanName);
/** Compute the keyness of a field.
* The value returned is the keyness of the field, if it is
* computable. If it is not, the candidate value is returned.
* @param ejbName The value of the ejb-name element for a bean.
* @param fieldName The name of a container managed field in the named bean.
* @param candidate The value "proposed" by the content of the sun-cmp-mapping file.
* @return The real value of the keyness of a field.
* This may be different than the candidate value,
* if the correct values of a fields keyness can
* be computed from available data.
*/
public boolean isKey(String beanName, String fieldName, boolean candidate);
/** Return the name of the opposite roles ejb-name
* @param ejbName The value of the ejb-name element for a bean.
* @param fieldName The name of a container managed field in the named bean.
* @return The ejb-name of the bean that is referenced by a
* relationship field. This is the ejb-name of the
* "other" roles relationship-role-source.
*/
public String getRelationshipFieldContent(String ejbName, String fieldName);
/**
* @param ejbName The ejb-name element for the bean
* @param fieldName The name of a container managed field in the named bean.
* @return The String values "One" or "Many".
*/
public String getMultiplicity(String ejbName, String fieldName);
/**
* @param ejbName The value of the ejb-name element for a bean.
* @param fieldName The name of a container managed field in the named bean.
* @return */
public String getRelationshipFieldType(String ejbName, String fieldName);
/**
* @param ejbName The value of the ejb-name element for a bean.
* @param fieldName The name of a container managed field in the named bean.
* @return */
public String getInverseFieldName(String ejbName, String fieldName);
/**
* Returns flag whether the mapping conversion should apply the default
* strategy for dealing with unknown primary key classes. This method will
* only be called when {@link #generateFields} returns <code>true</code>.
* @param ejbName The value of the ejb-name element for a bean.
* @return <code>true</code> to apply the default unknown PK Class Strategy,
* <code>false</code> otherwise
*/
public boolean applyDefaultUnknownPKClassStrategy(String ejbName);
/**
* Returns the name used for generated primary key fields.
* @return a string for key field name
*/
public String getGeneratedPKFieldName();
/**
* Returns the prefix used for generated version fields.
* @return a string for version field name prefix
*/
public String getGeneratedVersionFieldNamePrefix();
/**
* @param ejbName The ejb-name element for the bean
* @param fieldName The name of a container managed field in the named bean.
* @return boolean flag indicating whether the objects in this collection field are to
* be deleted when this field' owning object is deleted.
*/
public boolean relatedObjectsAreDeleted(String ejbName, String fieldName);
/**
* Returns the flag whether the mapping conversion should generate
* relationship fields and primary key fields to support run-time.
* The version field is always created even {@link #generateFields} is
* <code>false</code> because it holds version column information.
* @return <code>true</code> to generate fields in the dot-mapping file
* (if they are not present).
*/
public boolean generateFields();
/**
* Sets the flag whether the mapping conversion should generate relationship
* fields, primary key fields, and version fields to support run-time.
* @param generateFields a flag which indicates whether fields should be
* generated
*/
public void setGenerateFields(boolean generateFields);
/** Returns the flag whether the mapping conversion should validate
* all fields against schema columns.
* @return <code>true</code> to validate all the fields in the dot-mapping
* file.
*/
public boolean ensureValidation();
/**
* Sets the flag whether the mapping conversion should validate all fields
* against schema columns.
* @param isValidating a boolean of indicating validating fields or not
*/
public void setEnsureValidation(boolean isValidating);
/**
* Returns <code>true</code> if the field is generated. There are three
* types of generated fields: generated relationships, unknown primary key
* fields, and version consistency fields.
* @param ejbName The ejb-name element for the bean
* @param fieldName The name of a container managed field in the named bean
* @return <code>true</code> if the field is generated; <code>false</code>
* otherwise.
*/
public boolean isGeneratedField(String ejbName, String fieldName);
/** Flag whether the conversion helper generated the relationship field
* @param ejbName The ejb-name element for the bean
* @param fieldName The name of a container managed field in the named bean.
* @return <code>true</code> if the field was created by the conversion
* helper.
*/
public boolean isGeneratedRelationship(String ejbName, String fieldName);
/**
* Returns a list of generated relationship field names.
* @param ejbName The ejb-name element for the bean
* @return a list of generated relationship field names
*/
public List getGeneratedRelationships(String ejbName);
}
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