Example usage for org.hibernate.engine.spi QueryParameters traceParameters

Introduction

In this page you can find the example usage for org.hibernate.engine.spi QueryParameters traceParameters.

Prototype

public void traceParameters(SessionFactoryImplementor factory) throws HibernateException 

Source Link

Usage

From source file:org.babyfish.hibernate.hql.XQueryPlan.java

License:Open Source License

public <T> List<T> performList(SessionImplementor session, QueryParameters queryParameters,
        QueryType queryMode) {//  w  w w  .  j av a  2 s .  c  o m
    if (log.isTraceEnabled()) {
        log.trace("find: " + getSourceQuery());
        queryParameters.traceParameters(session.getFactory());
    }
    QueryTranslator[] translators = this.getTranslators();
    boolean hasLimit = queryParameters.getRowSelection() != null
            && queryParameters.getRowSelection().definesLimits();
    boolean needsMemoryLimit = hasLimit && translators.length > 1;
    QueryParameters queryParametersToUse;
    if (needsMemoryLimit) {
        if (!SettingsFactory.isLimitInMemoryEnabled(session.getFactory().getProperties())) {
            throw new QueryException(LAZY_RESOURCE.get().hibernateLimitInMemoryForPolymorphicQueryIsNotEnabled(
                    SettingsFactory.ENABLE_LIMIT_IN_MEMORY));
        }
        log.warn("firstResult/maxResults specified on polymorphic query; applying in memory!");
        RowSelection selection = new RowSelection();
        selection.setFetchSize(queryParameters.getRowSelection().getFetchSize());
        selection.setTimeout(queryParameters.getRowSelection().getTimeout());
        queryParametersToUse = queryParameters.createCopyUsing(selection);
    } else {
        queryParametersToUse = queryParameters;
    }

    List<T> combinedResults = new ArrayList<T>();
    Set<T> distinction = new LinkedHashSet<T>(ReferenceEqualityComparator.getInstance());
    int includedCount = -1;
    translator_loop: for (int i = 0; i < translators.length; i++) {
        List<T> tmp = ((XQueryTranslator) translators[i]).list(session, queryParametersToUse, queryMode);
        if (needsMemoryLimit) {
            // NOTE : firstRow is zero-based
            int first = queryParameters.getRowSelection().getFirstRow() == null ? 0
                    : queryParameters.getRowSelection().getFirstRow().intValue();
            int max = queryParameters.getRowSelection().getMaxRows() == null ? -1
                    : queryParameters.getRowSelection().getMaxRows().intValue();
            final int size = tmp.size();
            for (int x = 0; x < size; x++) {
                final T result = tmp.get(x);
                if (!distinction.add(result)) {
                    continue;
                }
                includedCount++;
                if (includedCount < first) {
                    continue;
                }
                combinedResults.add(result);
                if (max >= 0 && includedCount > max) {
                    break translator_loop; // break the outer loop !!!
                }
            }
        } else {
            if (translators.length == 1) {
                return tmp;
            } else {
                combinedResults.addAll(tmp);
            }
        }
    }
    return combinedResults;
}

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