/**
 * Abstract base class for document ingesters that process and transform documents
 * before they are indexed. Ingesters can be used to modify document content,
 * extract additional metadata, or perform other transformations during the
 * indexing process.
 *
 * Ingesters are processed in priority order, with lower numbers having higher priority.
 */
public abstract class Ingester {

     *
     * @param ingester the ingester to add
     */
    public synchronized void add(final Ingester ingester) {
        if (logger.isDebugEnabled()) {
            logger.debug("Loaded {}", ingester.getClass().getSimpleName());
        }
        final Ingester[] newIngesters = Arrays.copyOf(ingesters, ingesters.length + 1);
        newIngesters[ingesters.length] = ingester;

            return resultData;
        }
        ResultData target = resultData;
        for (final Ingester ingester : ingestFactory.getIngesters()) {
            try {
                target = ingester.process(target, responseData);
            } catch (final Exception e) {
                logger.warn("Failed to process Ingest[{}]", ingester.getClass().getSimpleName(), e);
            }
        }
        return target;
    }

            return dataMap;
        }
        Map<String, Object> target = dataMap;
        for (final Ingester ingester : ingestFactory.getIngesters()) {
            try {
                target = ingester.process(target, paramMap);
            } catch (final Exception e) {
                logger.warn("Failed to process Ingest[{}]", ingester.getClass().getSimpleName(), e);
            }
        }
        return target;
    }

    }

    private static class TestIngestFactory extends IngestFactory {
        List<Ingester> ingesters = new ArrayList<>();

        @Override
        public Ingester[] getIngesters() {
            return ingesters.toArray(new Ingester[0]);
        }
    }

    private static class TestIngester extends Ingester {
        int processCalled = 0;

        @Override

        factory.add(new TestIngester(2));
        factory.add(new TestIngester(1));
        Ingester[] ingesters = factory.getIngesters();
        assertEquals(1, ingesters[0].getPriority());
        assertEquals(2, ingesters[1].getPriority());
        assertEquals(3, ingesters[2].getPriority());
    }

    private static class TestIngester extends Ingester {
        public TestIngester(int priority) {
            this.priority = priority;

        @Override
        public Ingester[] getIngesters() {
            return new Ingester[] { new TestIngester(throwException) };
        }

        public void setThrowException(boolean throwException) {
            this.throwException = throwException;
        }
    }

    private static class TestIngester extends Ingester {
        private final boolean throwException;

            return map;
        }
        Map<String, Object> target = map;
        for (final Ingester ingester : ingestFactory.getIngesters()) {
            try {
                target = ingester.process(target, accessResult);
            } catch (final Exception e) {
                logger.warn("Failed to process Ingest[{}]", ingester.getClass().getSimpleName(), e);
            }
        }
        return target;
    }