76 lines
3.0 KiB
Java
76 lines
3.0 KiB
Java
package fr.pandacube.lib.db;
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import fr.pandacube.lib.util.Log;
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/**
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* A foreign key field in a SQL table.
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* @param <F> the table class of this current foreign key field
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* @param <T> the Java type of this field
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* @param <P> the table class of the targeted primary key
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*/
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public class SQLFKField<F extends SQLElement<F>, T, P extends SQLElement<P>> extends SQLField<F, T> {
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private SQLField<P, T> sqlPrimaryKeyField;
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private Class<P> sqlForeignKeyElemClass;
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/* package */ SQLFKField(SQLType<T> t, boolean nul, T deflt, Class<P> fkEl, SQLField<P, T> fkF) {
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super(t, nul, deflt);
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construct(fkEl, fkF);
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}
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/* package */ static <E extends SQLElement<E>, F extends SQLElement<F>> SQLFKField<E, Integer, F> idFK(boolean nul, Class<F> fkEl) {
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return idFK(nul, null, fkEl);
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}
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/* package */ static <E extends SQLElement<E>, F extends SQLElement<F>> SQLFKField<E, Integer, F> idFK(boolean nul, Integer deflt, Class<F> fkEl) {
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if (fkEl == null) throw new IllegalArgumentException("foreignKeyElement can't be null");
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try {
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SQLField<F, Integer> f = DB.getSQLIdField(fkEl);
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return new SQLFKField<>(f.type, nul, deflt, fkEl, f);
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} catch (DBInitTableException e) {
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Log.severe("Can't create Foreign key Field targeting id field of '"+fkEl+"'", e);
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return null;
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}
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}
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/* package */ static <E extends SQLElement<E>, T, F extends SQLElement<F>> SQLFKField<E, T, F> customFK(boolean nul, Class<F> fkEl, SQLField<F, T> fkF) {
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return customFK(nul, null, fkEl, fkF);
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}
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/* package */ static <E extends SQLElement<E>, T, F extends SQLElement<F>> SQLFKField<E, T, F> customFK(boolean nul, T deflt, Class<F> fkEl, SQLField<F, T> fkF) {
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if (fkEl == null) throw new IllegalArgumentException("foreignKeyElement can't be null");
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return new SQLFKField<>(fkF.type, nul, deflt, fkEl, fkF);
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}
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private void construct(Class<P> fkEl, SQLField<P, T> fkF) {
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if (fkF == null) throw new IllegalArgumentException("foreignKeyField can't be null");
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try {
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DB.initTable(fkEl);
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} catch (DBInitTableException e) {
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throw new RuntimeException(e);
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}
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if (fkF.getSQLElementType() == null)
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throw new RuntimeException("Can't initialize foreign key. The primary key in the table " + fkEl.getName() + " is not properly initialized and can't be targeted by a foreign key");
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sqlPrimaryKeyField = fkF;
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sqlForeignKeyElemClass = fkEl;
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}
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/**
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* Gets the targeted field of this foreign key.
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* @return the targeted field of this foreign key.
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*/
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public SQLField<P, T> getPrimaryField() {
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return sqlPrimaryKeyField;
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}
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/**
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* Gets the type of the table containing the targeted field of this foreign key.
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* @return the type of the table containing the targeted field of this foreign key.
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*/
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public Class<P> getForeignElementClass() {
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return sqlForeignKeyElemClass;
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}
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}
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