Example usage for javax.persistence.criteria Join getAttribute

Introduction

In this page you can find the example usage for javax.persistence.criteria Join getAttribute.

Prototype

Attribute<? super Z, ?> getAttribute();

Source Link

Document

Return the metamodel attribute corresponding to the join.

Usage

From source file:org.querybyexample.jpa.JpaUtil.java

/**
 * Convert the passed propertyPath into a JPA path.
 * <p>/*from   w  w  w  .  jav a2s .  c  o  m*/
 * Note: JPA will do joins if the property is in an associated entity.
 */
@SuppressWarnings("unchecked")
public static <E, F> Path<F> getPath(Root<E> root, List<Attribute<?, ?>> attributes) {
    Path<?> path = root;
    for (Attribute<?, ?> attribute : attributes) {
        boolean found = false;
        // handle case when order on already fetched attribute
        for (Fetch<E, ?> fetch : root.getFetches()) {
            if (attribute.getName().equals(fetch.getAttribute().getName()) && (fetch instanceof Join<?, ?>)) {
                path = (Join<E, ?>) fetch;
                found = true;
                break;
            }
        }
        for (Join<E, ?> join : root.getJoins()) {
            if (attribute.getName().equals(join.getAttribute().getName())) {
                path = join;
                found = true;
                break;
            }
        }
        if (!found) {
            path = path.get(attribute.getName());
        }
    }
    return (Path<F>) path;
}

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

/**
 * Copy Joins/*from   w  ww .  j av a2 s.  c o  m*/
 * @param from source Join
 * @param to destination Join
 */
public static void copyJoins(From<?, ?> from, From<?, ?> to) {
    for (Join<?, ?> j : from.getJoins()) {
        Join<?, ?> toJoin = to.join(j.getAttribute().getName(), j.getJoinType());
        toJoin.alias(getOrCreateAlias(j));

        copyJoins(j, toJoin);
    }

    for (Fetch<?, ?> f : from.getFetches()) {
        Fetch<?, ?> toFetch = to.fetch(f.getAttribute().getName());
        copyFetches(f, toFetch);

    }
}

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

private void copyJoins(From<?, ?> from, From<?, ?> to) {
    for (Join<?, ?> join : from.getJoins()) {
        Join<?, ?> toJoin = to.join(join.getAttribute().getName(), join.getJoinType());
        toJoin.alias(getAlias(join));/*from   w  w w  .  j a  v  a 2  s  . c  o m*/
        copyJoins(join, toJoin);
    }
    for (Fetch<?, ?> fetch : from.getFetches()) {
        Fetch<?, ?> toFetch = to.fetch(fetch.getAttribute().getName());
        copyFetches(fetch, toFetch);
    }
}

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From source file:ru.savvy.jpafilterbuilder.FilterCriteriaBuilder.java

private Join reuseJoin(From<?, ?> path, String fieldName, boolean outer) {
    for (Join join : path.getJoins()) {
        if (join.getAttribute().getName().equals(fieldName)) {
            if ((join.getJoinType() == JoinType.LEFT) == outer) {
                logger.debug("Reusing existing join for field " + fieldName);
                return join;
            }// w  w  w . ja  v a2s  .c  o  m
        }
    }
    return outer ? path.join(fieldName, JoinType.LEFT) : path.join(fieldName);
}

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