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 * Hibernate, Relational Persistence for Idiomatic Java
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package org.hibernate.metamodel.relational;

import java.util.ArrayList;
import java.util.List;

import org.hibernate.AssertionFailure;
import org.hibernate.dialect.Dialect;

Support for writing Constraint implementations
Author:Steve Ebersole, Gail Badner
@tododo we need to support defining these on particular schemas/catalogs?
/** * Support for writing {@link Constraint} implementations * * @todo do we need to support defining these on particular schemas/catalogs? * * @author Steve Ebersole * @author Gail Badner */
public abstract class AbstractConstraint implements Constraint { private final TableSpecification table; private final String name; private List<Column> columns = new ArrayList<Column>(); protected AbstractConstraint(TableSpecification table, String name) { this.table = table; this.name = name; } public TableSpecification getTable() { return table; } public String getName() { return name; } public Iterable<Column> getColumns() { return columns; } protected int getColumnSpan() { return columns.size(); } protected List<Column> internalColumnAccess() { return columns; } public void addColumn(Column column) { internalAddColumn( column ); } protected void internalAddColumn(Column column) { if ( column.getTable() != getTable() ) { throw new AssertionFailure( String.format( "Unable to add column to constraint; tables [%s, %s] did not match", column.getTable().toLoggableString(), getTable().toLoggableString() ) ); } columns.add( column ); } protected boolean isCreationVetoed(Dialect dialect) { return false; } protected abstract String sqlConstraintStringInAlterTable(Dialect dialect); public String[] sqlDropStrings(Dialect dialect) { if ( isCreationVetoed( dialect ) ) { return null; } else { return new String[] { new StringBuilder() .append( "alter table " ) .append( getTable().getQualifiedName( dialect ) ) .append( " drop constraint " ) .append( dialect.quote( getName() ) ) .toString() }; } } public String[] sqlCreateStrings(Dialect dialect) { if ( isCreationVetoed( dialect ) ) { return null; } else { return new String[] { new StringBuilder( "alter table " ) .append( getTable().getQualifiedName( dialect ) ) .append( sqlConstraintStringInAlterTable( dialect ) ) .toString() }; } } }