Examples with CachingTokenFilter org.apache.lucene.analysis.CachingTokenFilter used on opensource projects

Example 11 with CachingTokenFilter

use of org.apache.lucene.analysis.CachingTokenFilter in project lucene-skos by behas.

the class SKOSQueryNodeProcessor method postProcessNode.

@Override
protected QueryNode postProcessNode(QueryNode node) throws QueryNodeException {
    if (node instanceof TextableQueryNode && !(node instanceof WildcardQueryNode) && !(node instanceof FuzzyQueryNode) && !(node instanceof RegexpQueryNode) && !(node.getParent() instanceof RangeQueryNode)) {
        FieldQueryNode fieldNode = ((FieldQueryNode) node);
        String text = fieldNode.getTextAsString();
        String field = fieldNode.getFieldAsString();
        CachingTokenFilter buffer = null;
        PositionIncrementAttribute posIncrAtt = null;
        int numTokens = 0;
        int positionCount = 0;
        boolean severalTokensAtSamePosition = false;
        try {
            try (TokenStream source = this.analyzer.tokenStream(field, text)) {
                buffer = new CachingTokenFilter(source);
                buffer.reset();
                if (buffer.hasAttribute(PositionIncrementAttribute.class)) {
                    posIncrAtt = buffer.getAttribute(PositionIncrementAttribute.class);
                }
                try {
                    while (buffer.incrementToken()) {
                        numTokens++;
                        int positionIncrement = (posIncrAtt != null) ? posIncrAtt.getPositionIncrement() : 1;
                        if (positionIncrement != 0) {
                            positionCount += positionIncrement;
                        } else {
                            severalTokensAtSamePosition = true;
                        }
                    }
                } catch (IOException e) {
                // ignore
                }
                // rewind the buffer stream
                // will never through on subsequent reset calls
                buffer.reset();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
            if (!buffer.hasAttribute(CharTermAttribute.class)) {
                return new NoTokenFoundQueryNode();
            }
            CharTermAttribute termAtt = buffer.getAttribute(CharTermAttribute.class);
            if (numTokens == 0) {
                return new NoTokenFoundQueryNode();
            } else if (numTokens == 1) {
                String term = null;
                try {
                    boolean hasNext;
                    hasNext = buffer.incrementToken();
                    assert hasNext == true;
                    term = termAtt.toString();
                } catch (IOException e) {
                // safe to ignore, because we know the number of tokens
                }
                fieldNode.setText(term);
                return fieldNode;
            } else if (severalTokensAtSamePosition || !(node instanceof QuotedFieldQueryNode)) {
                if (positionCount == 1 || !(node instanceof QuotedFieldQueryNode)) {
                    if (positionCount == 1) {
                        // simple case: only one position, with synonyms
                        LinkedList<QueryNode> children = new LinkedList<>();
                        for (int i = 0; i < numTokens; i++) {
                            String term = null;
                            try {
                                boolean hasNext = buffer.incrementToken();
                                assert hasNext == true;
                                term = termAtt.toString();
                            } catch (IOException e) {
                            // safe to ignore, because we know the number of tokens
                            }
                            if (buffer.hasAttribute(SKOSTypeAttribute.class) && boosts != null) {
                                SKOSTypeAttribute skosAttr = buffer.getAttribute(SKOSTypeAttribute.class);
                                children.add(new BoostQueryNode(new FieldQueryNode(field, term, -1, -1), getBoost(skosAttr.getSkosType())));
                            } else {
                                children.add(new FieldQueryNode(field, term, -1, -1));
                            }
                        }
                        return new GroupQueryNode(new StandardBooleanQueryNode(children, positionCount == 1));
                    } else {
                        // multiple positions
                        QueryNode q = new StandardBooleanQueryNode(Collections.<QueryNode>emptyList(), false);
                        QueryNode currentQuery = null;
                        for (int i = 0; i < numTokens; i++) {
                            String term = null;
                            try {
                                boolean hasNext = buffer.incrementToken();
                                assert hasNext == true;
                                term = termAtt.toString();
                            } catch (IOException e) {
                            // safe to ignore, because we know the number of tokens
                            }
                            if (posIncrAtt != null && posIncrAtt.getPositionIncrement() == 0) {
                                if (!(currentQuery instanceof BooleanQueryNode)) {
                                    QueryNode t = currentQuery;
                                    currentQuery = new StandardBooleanQueryNode(Collections.<QueryNode>emptyList(), true);
                                    ((BooleanQueryNode) currentQuery).add(t);
                                }
                                ((BooleanQueryNode) currentQuery).add(new FieldQueryNode(field, term, -1, -1));
                            } else {
                                if (currentQuery != null) {
                                    if (this.defaultOperator == Operator.OR) {
                                        q.add(currentQuery);
                                    } else {
                                        q.add(new ModifierQueryNode(currentQuery, Modifier.MOD_REQ));
                                    }
                                }
                                currentQuery = new FieldQueryNode(field, term, -1, -1);
                            }
                        }
                        if (this.defaultOperator == Operator.OR) {
                            q.add(currentQuery);
                        } else {
                            q.add(new ModifierQueryNode(currentQuery, Modifier.MOD_REQ));
                        }
                        if (q instanceof BooleanQueryNode) {
                            q = new GroupQueryNode(q);
                        }
                        return q;
                    }
                } else {
                    // phrase query:
                    MultiPhraseQueryNode mpq = new MultiPhraseQueryNode();
                    List<FieldQueryNode> multiTerms = new ArrayList<>();
                    int position = -1;
                    int i = 0;
                    int termGroupCount = 0;
                    for (; i < numTokens; i++) {
                        String term = null;
                        int positionIncrement = 1;
                        try {
                            boolean hasNext = buffer.incrementToken();
                            assert hasNext == true;
                            term = termAtt.toString();
                            if (posIncrAtt != null) {
                                positionIncrement = posIncrAtt.getPositionIncrement();
                            }
                        } catch (IOException e) {
                        // safe to ignore, because we know the number of tokens
                        }
                        if (positionIncrement > 0 && multiTerms.size() > 0) {
                            for (FieldQueryNode termNode : multiTerms) {
                                if (this.positionIncrementsEnabled) {
                                    termNode.setPositionIncrement(position);
                                } else {
                                    termNode.setPositionIncrement(termGroupCount);
                                }
                                mpq.add(termNode);
                            }
                            // Only increment once for each "group" of
                            // terms that were in the same position:
                            termGroupCount++;
                            multiTerms.clear();
                        }
                        position += positionIncrement;
                        multiTerms.add(new FieldQueryNode(field, term, -1, -1));
                    }
                    for (FieldQueryNode termNode : multiTerms) {
                        if (this.positionIncrementsEnabled) {
                            termNode.setPositionIncrement(position);
                        } else {
                            termNode.setPositionIncrement(termGroupCount);
                        }
                        mpq.add(termNode);
                    }
                    return mpq;
                }
            } else {
                TokenizedPhraseQueryNode pq = new TokenizedPhraseQueryNode();
                int position = -1;
                for (int i = 0; i < numTokens; i++) {
                    String term = null;
                    int positionIncrement = 1;
                    try {
                        boolean hasNext = buffer.incrementToken();
                        assert hasNext == true;
                        term = termAtt.toString();
                        if (posIncrAtt != null) {
                            positionIncrement = posIncrAtt.getPositionIncrement();
                        }
                    } catch (IOException e) {
                    // safe to ignore, because we know the number of tokens
                    }
                    FieldQueryNode newFieldNode = new FieldQueryNode(field, term, -1, -1);
                    if (this.positionIncrementsEnabled) {
                        position += positionIncrement;
                        newFieldNode.setPositionIncrement(position);
                    } else {
                        newFieldNode.setPositionIncrement(i);
                    }
                    pq.add(newFieldNode);
                }
                return pq;
            }
        } finally {
            if (buffer != null) {
                try {
                    buffer.close();
                } catch (IOException e) {
                // safe to ignore
                }
            }
        }
    }
    return node;
}

Example 12 with CachingTokenFilter

use of org.apache.lucene.analysis.CachingTokenFilter in project janusgraph by JanusGraph.

the class SolrIndex method customTokenize.

@SuppressWarnings("unchecked")
private List<String> customTokenize(String tokenizerClass, String value) {
    CachingTokenFilter stream = null;
    try {
        final List<String> terms = new ArrayList<>();
        final Tokenizer tokenizer = ((Constructor<Tokenizer>) ClassLoader.getSystemClassLoader().loadClass(tokenizerClass).getConstructor()).newInstance();
        tokenizer.setReader(new StringReader(value));
        stream = new CachingTokenFilter(tokenizer);
        final TermToBytesRefAttribute termAtt = stream.getAttribute(TermToBytesRefAttribute.class);
        stream.reset();
        while (stream.incrementToken()) {
            terms.add(termAtt.getBytesRef().utf8ToString());
        }
        return terms;
    } catch (ReflectiveOperationException | IOException e) {
        throw new IllegalArgumentException(e.getMessage(), e);
    } finally {
        IOUtils.closeQuietly(stream);
    }
}