Examples with RowIterator javax.jcr.query.RowIterator used on opensource projects

Example 86 with RowIterator

use of javax.jcr.query.RowIterator in project sling by apache.

the class BasicQueryLanguageProvider method queryResources.

@Override
public Iterator<ValueMap> queryResources(final ResolveContext<JcrProviderState> ctx, final String query, final String language) {
    final String queryLanguage = ArrayUtils.contains(getSupportedLanguages(ctx), language) ? language : DEFAULT_QUERY_LANGUAGE;
    try {
        final QueryResult result = JcrResourceUtil.query(ctx.getProviderState().getSession(), query, queryLanguage);
        final String[] colNames = result.getColumnNames();
        final RowIterator rows = result.getRows();
        return new Iterator<ValueMap>() {

            private ValueMap next;

            {
                next = seek();
            }

            @Override
            public boolean hasNext() {
                return next != null;
            }

            ;

            @Override
            public ValueMap next() {
                if (next == null) {
                    throw new NoSuchElementException();
                }
                final ValueMap result = next;
                next = seek();
                return result;
            }

            private ValueMap seek() {
                ValueMap result = null;
                while (result == null && rows.hasNext()) {
                    try {
                        final Row jcrRow = rows.nextRow();
                        final String resourcePath = jcrRow.getPath();
                        if (resourcePath != null && providerContext.getExcludedPaths().matches(resourcePath) == null) {
                            final Map<String, Object> row = new HashMap<String, Object>();
                            boolean didPath = false;
                            boolean didScore = false;
                            final Value[] values = jcrRow.getValues();
                            for (int i = 0; i < values.length; i++) {
                                Value v = values[i];
                                if (v != null) {
                                    String colName = colNames[i];
                                    row.put(colName, JcrResourceUtil.toJavaObject(values[i]));
                                    if (colName.equals(QUERY_COLUMN_PATH)) {
                                        didPath = true;
                                        row.put(colName, JcrResourceUtil.toJavaObject(values[i]).toString());
                                    }
                                    if (colName.equals(QUERY_COLUMN_SCORE)) {
                                        didScore = true;
                                    }
                                }
                            }
                            if (!didPath) {
                                row.put(QUERY_COLUMN_PATH, jcrRow.getPath());
                            }
                            if (!didScore) {
                                row.put(QUERY_COLUMN_SCORE, jcrRow.getScore());
                            }
                            result = new ValueMapDecorator(row);
                        }
                    } catch (final RepositoryException re) {
                        logger.error("queryResources$next: Problem accessing row values", re);
                    }
                }
                return result;
            }

            @Override
            public void remove() {
                throw new UnsupportedOperationException("remove");
            }
        };
    } catch (final javax.jcr.query.InvalidQueryException iqe) {
        throw new QuerySyntaxException(iqe.getMessage(), query, language, iqe);
    } catch (final RepositoryException re) {
        throw new SlingException(re.getMessage(), re);
    }
}