Example usage for javax.persistence.criteria Selection getAlias

Introduction

In this page you can find the example usage for javax.persistence.criteria Selection getAlias.

Prototype

String getAlias();

Source Link

Document

Return the alias assigned to the tuple element or null, if no alias has been assigned.

Usage

From source file:org.jdal.dao.jpa.JpaUtils.java

/**
 * Gets The result alias, if none set a default one and return it
 * @param selection /*from w  w  w . j av a  2 s .c o  m*/
 * @return root alias or generated one
 */
public static synchronized <T> String getOrCreateAlias(Selection<T> selection) {
    // reset alias count
    if (aliasCount > 1000)
        aliasCount = 0;

    String alias = selection.getAlias();
    if (alias == null) {
        alias = "JDAL_generatedAlias" + aliasCount++;
        selection.alias(alias);
    }
    return alias;

}

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From source file:com.impetus.kundera.persistence.CriteriaQueryTranslator.java

/**
 * Method to translate criteriaQuery into JPQL.
 * /*  www. j  av  a2s  .  c  om*/
 * @param criteriaQuery
 *            criteria query.
 * 
 * @return JPQL string.
 */
static <S> String translate(CriteriaQuery criteriaQuery) {
    QueryBuilder builder = new CriteriaQueryTranslator.QueryBuilder();

    // validate if criteria query is valid

    /**
     * select, from clause is mandatory
     * 
     * multiple from clause not support where clause is optional
     * 
     */

    Selection<S> select = criteriaQuery.getSelection();

    if (select != null) {
        builder.appendSelectClause();

    }

    if (select.getClass().isAssignableFrom(DefaultCompoundSelection.class)
            && ((CompoundSelection) select).isCompoundSelection()) {
        List<Selection<?>> selections = ((CompoundSelection) select).getCompoundSelectionItems();
        builder.appendMultiSelect(selections);
    } else if (select instanceof AggregateExpression) {
        builder.appendAggregate(((AggregateExpression) select).getAggregation());
    } else {
        String alias = select.getAlias();

        if (!StringUtils.isEmpty(alias)) {
            builder.appendAlias(alias);
        }

        Attribute attribute = ((DefaultPath) select).getAttribute();

        if (attribute != null) {
            builder.appendAttribute(attribute);
        }
    }
    Class<? extends S> clazzType = select.getJavaType();

    Set<Root<?>> roots = criteriaQuery.getRoots();

    Root<?> from = roots.iterator().next();

    Class entityClazz = from.getJavaType();

    builder.appendFromClause();

    // select.alias(paramString)
    builder.appendFrom(entityClazz);
    builder.appendAlias(from.getAlias() != null ? from.getAlias() : select.getAlias());
    Predicate where = criteriaQuery.getRestriction(); // this could be null.
    if (where != null) {
        builder.appendWhereClause();
        List<Expression<Boolean>> expressions = where.getExpressions();
        for (Expression expr : expressions) {
            builder.appendWhere(expr, from.getAlias());
        }

    }

    List<Order> orderings = criteriaQuery.getOrderList();

    if (orderings != null) {
        if (!orderings.isEmpty()) {
            builder.appendOrderClause(where == null);
        }

        for (Order order : orderings) {
            builder.appendAlias(from.getAlias() != null ? from.getAlias() : select.getAlias());
            builder.appendOrdering(order);
        }
    }
    return builder.getQuery();

    // check that roots has to be one. multiple clause not yet supported

}

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From source file:com.zero.dao.impl.BaseDaoImpl.java

private synchronized String getAlias(Selection<?> selection) {
    if (selection != null) {
        String alias = selection.getAlias();
        if (alias == null) {
            if (aliasCount >= 1000) {
                aliasCount = 0;/*from   ww  w  .  jav  a2  s  . c o  m*/
            }
            alias = "shopxxGeneratedAlias" + aliasCount++;
            selection.alias(alias);
        }
        return alias;
    }
    return null;
}

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From source file:net.groupbuy.dao.impl.BaseDaoImpl.java

private synchronized String getAlias(Selection<?> selection) {
    if (selection != null) {
        String alias = selection.getAlias();
        if (alias == null) {
            if (aliasCount >= 1000) {
                aliasCount = 0;//w  w w . ja  v a2 s .  c  o  m
            }
            alias = "groupbuyGeneratedAlias" + aliasCount++;
            selection.alias(alias);
        }
        return alias;
    }
    return null;
}

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From source file:com.dp2345.dao.impl.BaseDaoImpl.java

private synchronized String getAlias(Selection<?> selection) {
    if (selection != null) {
        String alias = selection.getAlias();
        if (alias == null) {
            if (aliasCount >= 1000) {
                aliasCount = 0;/*from w ww .  ja v  a  2 s .co m*/
            }
            alias = "dp2345GeneratedAlias" + aliasCount++;
            selection.alias(alias);
        }
        return alias;
    }
    return null;
}

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From source file:gov.guilin.dao.impl.BaseDaoImpl.java

private synchronized String getAlias(Selection<?> selection) {
    if (selection != null) {
        String alias = selection.getAlias();
        if (alias == null) {
            if (aliasCount >= 1000) {
                aliasCount = 0;// w  w  w .  j  a  va2  s .c  o m
            }
            alias = "guilinGeneratedAlias" + aliasCount++;
            selection.alias(alias);
        }
        return alias;
    }
    return null;
}

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From source file:net.osxx.dao.impl.BaseDaoImpl.java

private synchronized String getAlias(Selection<?> selection) {
    if (selection != null) {
        String alias = selection.getAlias();
        if (alias == null) {
            if (aliasCount >= 1000) {
                aliasCount = 0;//  w  w  w. j a  v a2  s .c  o  m
            }
            alias = "osxxGeneratedAlias" + aliasCount++;
            selection.alias(alias);
        }
        return alias;
    }
    return null;
}

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From source file:com.sammyun.dao.impl.BaseDaoImpl.java

private synchronized String getAlias(Selection<?> selection) {
    if (selection != null) {
        String alias = selection.getAlias();
        if (alias == null) {
            if (aliasCount >= 1000) {
                aliasCount = 0;//from w  w  w.  ja v a 2s  . com
            }
            alias = "preschoolEduGeneratedAlias" + aliasCount++;
            selection.alias(alias);
        }
        return alias;
    }
    return null;
}

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From source file:org.apache.openjpa.persistence.criteria.CriteriaQueryImpl.java

/**
 * Gets the alias of the given node. Creates an automatic alias, if necessary.
 *///from   w w w.  j  a  v a2s  .co  m
public String getAlias(Selection<?> selection) {
    String alias = selection.getAlias();
    if (alias != null) {
        _aliases.put(selection, alias);
        return alias;
    }
    alias = ALIAS_BASE + (++aliasCount);
    while (_aliases.containsValue(alias))
        alias = ALIAS_BASE + (++aliasCount);
    ((SelectionImpl<?>) selection).setAutoAlias(alias);
    _aliases.put(selection, alias);
    return _aliases.get(selection);
}

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From source file:org.batoo.jpa.core.impl.criteria.jpql.JpqlQuery.java

/**
 * Constructs the order by fragment of the query.
 * /* w ww  . ja  va  2s .com*/
 * @param cb
 *            the criteria builder
 * @param q
 *            the query
 * @param selections
 *            the selections
 * @param orderBy
 *            the order by definitions
 * 
 * @since 2.0.0
 */
private void constructOrder(CriteriaBuilderImpl cb, CriteriaQueryImpl<?> q, List<Selection<?>> selections,
        Tree orderBy) {
    final List<Order> orders = Lists.newArrayList();

    for (int i = 0; i < orderBy.getChildCount(); i++) {
        final Tree orderByItem = orderBy.getChild(i);
        final Tree orderItem = orderByItem.getChild(0);

        Order order = null;

        if (orderItem.getType() == JpqlParser.ID) {
            final String alias = orderItem.getText();
            for (final Selection<?> selection : selections) {
                if (alias.equals(selection.getAlias())) {
                    order = orderByItem.getChildCount() == 2 ? //
                            cb.desc((Expression<?>) selection) : //
                            cb.asc((Expression<?>) selection);

                    break;
                }
            }

            if (order == null) {
                throw new PersistenceException("Alias is not bound: " + alias);
            }
        } else {

            order = orderByItem.getChildCount() == 2 ? //
                    cb.desc(this.getExpression(cb, q, orderItem, null)) : //
                    cb.asc(this.getExpression(cb, q, orderByItem.getChild(0), null));

        }

        orders.add(order);
    }

    q.orderBy(orders);
}

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