Tree Structure

core tree menu structure

The Statistics project contains a CRXModule, which writes arbitrary statistical information into a tree structure.

MSTParser is a non-projective dependency parser that searches for maximum spanning trees over directed graphs. Models of dependency structure are based on large-margin discriminative training methods. Projective parsing is also supported.

A bottom-up rewrite machine is a compiler construction tool that is often used in the compiler's back end to convert a tree-structured representation of a program into machine code -- or, in Java's case, bytecode. JBurg can also be used as a general-purpose dynamic programming engine. JBurg is descended from iburg-class BURGs, described in Fraser, Hanson, and Proebsting's paper, "Engineering a Simple, Efficient Code Generator Generator." JBurg brings similar O(N) minimum-cost tree rewriting capabilities to Java, and also allows the programmer to specify transitions between non-terminal states, that are significantly more powerful than iburg's transitive closures: JBurg transformation rules allow the transformation to inject additional program logic, which makes a JBurg specification more like a grammar than like a list of pattern-matching rules.

Immutable, structure sharing collections, including hash array mapped tries, finger tries, B-trees, and S-trees (sequence trees)

core tree menu structure

Example code for creating JTables with an embedded tree structure in Swing.

core tree menu structure

A visualization component for displaying tree structures from those schemes that can output graphs (e.g. bayes nets). This component is available from the popup menu in the Explorer's classify. The component uses the prefuse visualization library.

A visualization component for displaying tree structures from those schemes that can output trees (e.g. decision tree learners, Cobweb clusterer etc.). This component is available from the popup menu in the Explorer's classify and cluster panels. The component uses the prefuse visualization library.

Log-structured merge-tree table with fields representing aggregate functions, designed for OLAP workload.

Tree Data Structure Java Library

Lock-free document store—optimized for high rate atomic state changes—that concurrently commits and compacts on-disk log-structured storage files without blocking parallel in-memory updates to associative B-tree maps, spatial Q-tree maps, sequential S-tree lists, and singleton U-tree values

Data Structure for CoNLL-X Dependency Tree

core tree menu structure

Provides an api for operating with tree structures

ELKI is an open source (AGPLv3) data mining software written in Java. The focus of ELKI is research in algorithms, with an emphasis on unsupervised methods in cluster analysis and outlier detection. In order to achieve high performance and scalability, ELKI offers many data index structures such as the R*-tree that can provide major performance gains. ELKI is designed to be easy to extend for researchers and students in this domain, and welcomes contributions in particular of new methods. ELKI aims at providing a large collection of highly parameterizable algorithms, in order to allow easy and fair evaluation and benchmarking of algorithms.

Log-structured merge-tree table with fields representing aggregate functions, designed for OLAP workload.

ELKI is an open source (AGPLv3) data mining software written in Java. The focus of ELKI is research in algorithms, with an emphasis on unsupervised methods in cluster analysis and outlier detection. In order to achieve high performance and scalability, ELKI offers many data index structures such as the R*-tree that can provide major performance gains. ELKI is designed to be easy to extend for researchers and students in this domain, and welcomes contributions in particular of new methods. ELKI aims at providing a large collection of highly parameterizable algorithms, in order to allow easy and fair evaluation and benchmarking of algorithms.

Java 1.8+ Library with tree structures

Sirix is a temporal storage system effectively and efficiently storing snapshots of time varying (currently semi-structured) data taking full advantage of flash based drives as for instance SSDs. We not only provide several ways of navigating the tree-structure of a single revision, we also support navigation in time. Furthermore we provide a novel storage technique called sliding snapshot to circumvent intermitant full dump snapshots to fast track their in-memory reconstruction and thus we avoiding write peaks and having to read long chains of page fragments/increments/deltas. Sirix uses copy-on-write (COW) as well as an append-only storage making it an ideal candidate for flash based drives while not dropping support for erstwhile disks.

Java 1.8+ Library with tree structures

core tree menu structure

Multidimensional OLAP database with predefined set of dimensions, measures, and log-structured merge-tree tables containing pre-aggregated data.

JFace is a UI toolkit with classes for handling many common UI programming tasks. JFace is window-system-independent in both its API and implementation, and is designed to work with SWT without hiding it. JFace includes the usual UI toolkit components of image and font registries, text, dialog, preference and wizard frameworks, and progress reporting for long running operations. Two of its more interesting features are actions and viewers. The action mechanism allows user commands to be defined independently from their exact whereabouts in the UI. Viewers are model based adapters for certain SWT widgets, simplifying the presentation of application data structured as lists, tables or trees.

Multidimensional OLAP database with predefined set of dimensions, measures, and log-structured merge-tree tables containing pre-aggregated data.

Simple Java library for visualizing tree structures in the command line

Collection of handy data structures and algos for C#/Java specially designed for GC-free programming. ObjectPools, MutableBlobs, MutableStrings, BinaryHeaps, Linked Lists, Trees, fast memory copy, fast hash calculators and others..

Tree-structured ListAadapter for Android

A testing DSL to specify the structure of a tree in a concise and readable way.

An example of how the sodatest-junit artefact can be used to create a hierarchical structure of test sub-trees.

VFS is a virtual file system wich features mounting of other filesystems inside. This could be anything which is iterable in a tree-like structure.

This API allows to fill multi-children tree data structure based on a coherent input (text) or from relational database (unary relationship).

A tree data structure for Java

Simple implementation to store object in tree structure.

scala-tptp-parser is a library for parsing the input languages of the TPTP infrastructure for knowledge representation and reasoning. The package contains a data structure for the abstract syntax tree (AST) of the parsed input as well as the parser for the different language of the TPTP, see http://tptp.org for details. In particular, parser are available for: - THF (TH0/TH1): Monomorphic and polymorphic higher-order logic, - TFF (TF0/TF1): Monomorphic and polymorphic typed first-order logic, including extended TFF (TFX), - FOF: Untyped first-order logic, - TCF: Typed clause-normal form, - CNF: (Untyped) clause-normal form, and - TPI: TPTP Process Instruction language. The parser was initially based on v7.4.0.3 of the TPTP syntax BNF (http://tptp.org/TPTP/SyntaxBNF.html), but is continuously updated to keep track of TPTP language updates.

Simple implementation to store object in tree structure.

Simple implementation to store object in tree structure.

Simple implementation to store object in tree structure.

Persistent data structures in the form of immutable copy-on-write lists, maps and sets for Java. Based on balanced trees.

Java Object Model API to handle Java Objects in a tree structure. Be able to transform a linear structure of objects with a tree behavior into a real tree structure and handle them as if it were nodes in a tree.

modelcheck is a Java library that allows you to check whether a given transition system (described as a Kripke structure) satisfies a given computation tree logic (CTL) formula.

Decision Trees and related structures

Library providing observables arranged in tree structure with propagating events

A Java implementation of an Interval tree structure with generic Number support

A Java implementations of different Tries (prefix trees). These are ordered tree data structures commonly used for efficient string searches.

JSONXML project is library used to parse/format tree-like object structures in most popular text formats: XML and JSON. For parsing it accepts "java.io.Reader" and return java object. For formatting it accepts java object and "java.io.Writer". Object is generally structure that contains Map and/or List elements. Map is ordered set of named items. List is set of unnamed items. Reflection may be used to convert objects into set of maps/lists and vice versa. JSON parser is implemented explicitly. XML parser is based on SAX parser and applies only certain rules for result. Library is designed to allow various entry points for variable decisions depending on end use needs. 1. Formats - formats are used to enable locale-specific parsing/formatting of numbers and dates. 2. ReflectiveBuilder - enables reflection. Default implementation uses getters/setters only. 3. ObjectsRegistry - used to keep track of parsed or formatted objects and allow resolvable references in formatted (text) form.

A kotlin multiplatform experiment for representing app navigation with tree like data structures

Basic tree data structure and algorithms for Java

Tree Data Structure Java Library