Examples with DiscriminatorValue javax.persistence.DiscriminatorValue used on opensource projects

Example 6 with DiscriminatorValue

use of javax.persistence.DiscriminatorValue in project CloudStack-archive by CloudStack-extras.

the class SqlGenerator method buildDiscriminatorClause.

/**
     * buildDiscriminatorClause builds the join clause when there are multiple tables.
     * 
     * @return
     */
public Pair<StringBuilder, Map<String, Object>> buildDiscriminatorClause() {
    StringBuilder sql = new StringBuilder();
    Map<String, Object> values = new HashMap<String, Object>();
    for (Class<?> table : _tables) {
        DiscriminatorValue dv = table.getAnnotation(DiscriminatorValue.class);
        if (dv != null) {
            Class<?> parent = table.getSuperclass();
            String tableName = DbUtil.getTableName(parent);
            DiscriminatorColumn dc = parent.getAnnotation(DiscriminatorColumn.class);
            assert (dc != null) : "Parent does not have discrminator column: " + parent.getName();
            sql.append(tableName);
            sql.append(".");
            sql.append(dc.name()).append("=");
            Object value = null;
            if (dc.discriminatorType() == DiscriminatorType.INTEGER) {
                sql.append(dv.value());
                value = Integer.parseInt(dv.value());
            } else if (dc.discriminatorType() == DiscriminatorType.CHAR) {
                sql.append(dv.value());
                value = dv.value().charAt(0);
            } else if (dc.discriminatorType() == DiscriminatorType.STRING) {
                String v = dv.value();
                v = v.substring(0, v.length() < dc.length() ? v.length() : dc.length());
                sql.append("'").append(v).append("'");
                value = v;
            }
            values.put(dc.name(), value);
            sql.append(" AND ");
        }
    }
    return new Pair<StringBuilder, Map<String, Object>>(sql, values);
}