Examples with Concat org.apache.nifi.record.path.functions.Concat used on opensource projects

Example 1 with Concat

use of org.apache.nifi.record.path.functions.Concat in project nifi by apache.

the class RecordPathCompiler method buildPath.

public static RecordPathSegment buildPath(final Tree tree, final RecordPathSegment parent, final boolean absolute) {
    switch(tree.getType()) {
        case ROOT_REFERENCE:
            {
                return new RootPath();
            }
        case CHILD_REFERENCE:
            {
                final Tree childTree = tree.getChild(0);
                final int childTreeType = childTree.getType();
                if (childTreeType == FIELD_NAME) {
                    final String childName = childTree.getChild(0).getText();
                    return new ChildFieldPath(childName, parent, absolute);
                } else if (childTreeType == WILDCARD) {
                    return new WildcardChildPath(parent, absolute);
                } else {
                    throw new RecordPathException("Expected field name following '/' Token but found " + childTree);
                }
            }
        case ARRAY_INDEX:
            {
                final Tree indexListTree = tree.getChild(0);
                if (indexListTree.getType() == NUMBER_LIST) {
                    if (indexListTree.getChildCount() == 1 && indexListTree.getChild(0).getType() == NUMBER) {
                        final Tree indexTree = indexListTree.getChild(0);
                        final int index = Integer.parseInt(indexTree.getText());
                        return new ArrayIndexPath(index, parent, absolute);
                    }
                    final List<NumericRange> indexList = new ArrayList<>();
                    for (int i = 0; i < indexListTree.getChildCount(); i++) {
                        final Tree indexTree = indexListTree.getChild(i);
                        if (indexTree.getType() == NUMBER) {
                            final int index = Integer.valueOf(indexTree.getText());
                            indexList.add(new NumericRange(index, index));
                        } else if (indexTree.getType() == NUMBER_RANGE) {
                            final int min = Integer.valueOf(indexTree.getChild(0).getText());
                            final int max = Integer.valueOf(indexTree.getChild(1).getText());
                            indexList.add(new NumericRange(min, max));
                        } else {
                            throw new RecordPathException("Expected Number or Range following '[' Token but found " + indexTree);
                        }
                    }
                    return new MultiArrayIndexPath(indexList, parent, absolute);
                } else {
                    throw new RecordPathException("Expected Number or Range following '[' Token but found " + indexListTree);
                }
            }
        case MAP_KEY:
            {
                final Tree keyTree = tree.getChild(0);
                if (keyTree.getType() == STRING_LIST) {
                    if (keyTree.getChildCount() == 1) {
                        return new SingularMapKeyPath(keyTree.getChild(0).getText(), parent, absolute);
                    }
                    final List<String> keys = new ArrayList<>(keyTree.getChildCount());
                    for (int i = 0; i < keyTree.getChildCount(); i++) {
                        keys.add(keyTree.getChild(i).getText());
                    }
                    return new MultiMapKeyPath(keys, parent, absolute);
                } else {
                    throw new RecordPathException("Expected Map Key following '[' Token but found " + keyTree);
                }
            }
        case WILDCARD:
            {
                return new WildcardIndexPath(parent, absolute);
            }
        case DESCENDANT_REFERENCE:
            {
                final Tree childTree = tree.getChild(0);
                final int childTreeType = childTree.getType();
                if (childTreeType == FIELD_NAME) {
                    final String descendantName = childTree.getChild(0).getText();
                    return new DescendantFieldPath(descendantName, parent, absolute);
                } else if (childTreeType == WILDCARD) {
                    return new WildcardDescendantPath(parent, absolute);
                } else {
                    throw new RecordPathException("Expected field name following '//' Token but found " + childTree);
                }
            }
        case PARENT_REFERENCE:
            {
                return new ParentPath(parent, absolute);
            }
        case CURRENT_FIELD:
            {
                return new CurrentFieldPath(parent, absolute);
            }
        case STRING_LITERAL:
            {
                return new LiteralValuePath(parent, tree.getText(), absolute);
            }
        case NUMBER:
            {
                return new LiteralValuePath(parent, Integer.parseInt(tree.getText()), absolute);
            }
        case PREDICATE:
            {
                final Tree operatorTree = tree.getChild(0);
                final RecordPathFilter filter = createFilter(operatorTree, parent, absolute);
                return new PredicatePath(parent, filter, absolute);
            }
        case RELATIVE_PATH:
            {
                return compile(tree, parent, absolute);
            }
        case PATH:
            {
                return compile(tree, new RootPath(), absolute);
            }
        case FUNCTION:
            {
                final String functionName = tree.getChild(0).getText();
                final Tree argumentListTree = tree.getChild(1);
                switch(functionName) {
                    case "substring":
                        {
                            final RecordPathSegment[] args = getArgPaths(argumentListTree, 3, functionName, absolute);
                            return new Substring(args[0], args[1], args[2], absolute);
                        }
                    case "substringAfter":
                        {
                            final RecordPathSegment[] args = getArgPaths(argumentListTree, 2, functionName, absolute);
                            return new SubstringAfter(args[0], args[1], absolute);
                        }
                    case "substringAfterLast":
                        {
                            final RecordPathSegment[] args = getArgPaths(argumentListTree, 2, functionName, absolute);
                            return new SubstringAfterLast(args[0], args[1], absolute);
                        }
                    case "substringBefore":
                        {
                            final RecordPathSegment[] args = getArgPaths(argumentListTree, 2, functionName, absolute);
                            return new SubstringBefore(args[0], args[1], absolute);
                        }
                    case "substringBeforeLast":
                        {
                            final RecordPathSegment[] args = getArgPaths(argumentListTree, 2, functionName, absolute);
                            return new SubstringBeforeLast(args[0], args[1], absolute);
                        }
                    case "replace":
                        {
                            final RecordPathSegment[] args = getArgPaths(argumentListTree, 3, functionName, absolute);
                            return new Replace(args[0], args[1], args[2], absolute);
                        }
                    case "replaceRegex":
                        {
                            final RecordPathSegment[] args = getArgPaths(argumentListTree, 3, functionName, absolute);
                            return new ReplaceRegex(args[0], args[1], args[2], absolute);
                        }
                    case "replaceNull":
                        {
                            final RecordPathSegment[] args = getArgPaths(argumentListTree, 2, functionName, absolute);
                            return new ReplaceNull(args[0], args[1], absolute);
                        }
                    case "concat":
                        {
                            final int numArgs = argumentListTree.getChildCount();
                            final RecordPathSegment[] argPaths = new RecordPathSegment[numArgs];
                            for (int i = 0; i < numArgs; i++) {
                                argPaths[i] = buildPath(argumentListTree.getChild(i), null, absolute);
                            }
                            return new Concat(argPaths, absolute);
                        }
                    case "fieldName":
                        {
                            final RecordPathSegment[] args = getArgPaths(argumentListTree, 1, functionName, absolute);
                            return new FieldName(args[0], absolute);
                        }
                    case "toDate":
                        {
                            final RecordPathSegment[] args = getArgPaths(argumentListTree, 2, functionName, absolute);
                            return new ToDate(args[0], args[1], absolute);
                        }
                    case "format":
                        {
                            final RecordPathSegment[] args = getArgPaths(argumentListTree, 2, functionName, absolute);
                            return new Format(args[0], args[1], absolute);
                        }
                    default:
                        {
                            throw new RecordPathException("Invalid function call: The '" + functionName + "' function does not exist or can only " + "be used within a predicate, not as a standalone function");
                        }
                }
            }
    }
    throw new RecordPathException("Encountered unexpected token " + tree);
}