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Expert System Shell (Java)\n\nA simple and user-friendly expert system shell implemented in Java. The rule engine also support rule files written in Javascript.\n\nNote that this expert system shell do not require external dependencies for its logics\n\n[![Build Status](https://travis-ci.org/cschen1205/java-expert-system-shell.svg?branch=master)](https://travis-ci.org/cschen1205/java-expert-system-shell) [![Coverage Status](https://coveralls.io/repos/github/cschen1205/java-expert-system-shell/badge.svg?branch=master)](https://coveralls.io/github/cschen1205/java-expert-system-shell?branch=master)\n\n# Features\n\n- Forward Rule Chaining\n- Backward Rule Chaining\n- Backward Rule Chaining with Prompt\n- Support rules file written in Javascript\n\n# Install\n\nAdd the following dependency into your POM file:\n\n```xml\n\u003cdependency\u003e\n  \u003cgroupId\u003ecom.github.cschen1205\u003c/groupId\u003e\n  \u003cartifactId\u003ejava-expert-system-shell\u003c/artifactId\u003e\n  \u003cversion\u003e1.0.1\u003c/version\u003e\n\u003c/dependency\u003e\n```\n\n# Usage\n\n## Add rules and initialize the rule engine\n\nBelow is an example to create a rule engine from scratch with a set of rules in java\n\n```java\nprivate RuleInferenceEngine getInferenceEngine()\n{\n    RuleInferenceEngine rie=new KieRuleInferenceEngine();\n\n    Rule rule=new Rule(\"Bicycle\");\n    rule.addAntecedent(new EqualsClause(\"vehicleType\", \"cycle\"));\n    rule.addAntecedent(new EqualsClause(\"num_wheels\", \"2\"));\n    rule.addAntecedent(new EqualsClause(\"motor\", \"no\"));\n    rule.setConsequent(new EqualsClause(\"vehicle\", \"Bicycle\"));\n    rie.addRule(rule);\n\n    rule=new Rule(\"Tricycle\");\n    rule.addAntecedent(new EqualsClause(\"vehicleType\", \"cycle\"));\n    rule.addAntecedent(new EqualsClause(\"num_wheels\", \"3\"));\n    rule.addAntecedent(new EqualsClause(\"motor\", \"no\"));\n    rule.setConsequent(new EqualsClause(\"vehicle\", \"Tricycle\"));\n    rie.addRule(rule);\n\n    rule=new Rule(\"Motorcycle\");\n    rule.addAntecedent(new EqualsClause(\"vehicleType\", \"cycle\"));\n    rule.addAntecedent(new EqualsClause(\"num_wheels\", \"2\"));\n    rule.addAntecedent(new EqualsClause(\"motor\", \"yes\"));\n    rule.setConsequent(new EqualsClause(\"vehicle\", \"Motorcycle\"));\n    rie.addRule(rule);\n\n    rule=new Rule(\"SportsCar\");\n    rule.addAntecedent(new EqualsClause(\"vehicleType\", \"automobile\"));\n    rule.addAntecedent(new EqualsClause(\"size\", \"medium\"));\n    rule.addAntecedent(new EqualsClause(\"num_doors\", \"2\"));\n    rule.setConsequent(new EqualsClause(\"vehicle\", \"Sports_Car\"));\n    rie.addRule(rule);\n\n    rule=new Rule(\"Sedan\");\n    rule.addAntecedent(new EqualsClause(\"vehicleType\", \"automobile\"));\n    rule.addAntecedent(new EqualsClause(\"size\", \"medium\"));\n    rule.addAntecedent(new EqualsClause(\"num_doors\", \"4\"));\n    rule.setConsequent(new EqualsClause(\"vehicle\", \"Sedan\"));\n    rie.addRule(rule);\n\n    rule=new Rule(\"MiniVan\");\n    rule.addAntecedent(new EqualsClause(\"vehicleType\", \"automobile\"));\n    rule.addAntecedent(new EqualsClause(\"size\", \"medium\"));\n    rule.addAntecedent(new EqualsClause(\"num_doors\", \"3\"));\n    rule.setConsequent(new EqualsClause(\"vehicle\", \"MiniVan\"));\n    rie.addRule(rule);\n\n    rule=new Rule(\"SUV\");\n    rule.addAntecedent(new EqualsClause(\"vehicleType\", \"automobile\"));\n    rule.addAntecedent(new EqualsClause(\"size\", \"large\"));\n    rule.addAntecedent(new EqualsClause(\"num_doors\", \"4\"));\n    rule.setConsequent(new EqualsClause(\"vehicle\", \"SUV\"));\n    rie.addRule(rule);\n\n    rule=new Rule(\"Cycle\");\n    rule.addAntecedent(new LessClause(\"num_wheels\", \"4\"));\n    rule.setConsequent(new EqualsClause(\"vehicleType\", \"cycle\"));\n    rie.addRule(rule);\n\n    rule=new Rule(\"Automobile\");\n    rule.addAntecedent(new EqualsClause(\"num_wheels\", \"4\"));\n    rule.addAntecedent(new EqualsClause(\"motor\", \"yes\"));\n    rule.setConsequent(new EqualsClause(\"vehicleType\", \"automobile\"));\n    rie.addRule(rule);\n\n    return rie;\n}\n```\n\n## Infer more facts using forward chaining\n\n```java\npublic void testForwardChain()\n{\n    RuleInferenceEngine rie=getInferenceEngine();\n    rie.addFact(new EqualsClause(\"num_wheels\", \"4\"));\n    rie.addFact(new EqualsClause(\"motor\", \"yes\"));\n    rie.addFact(new EqualsClause(\"num_doors\", \"3\"));\n    rie.addFact(new EqualsClause(\"size\", \"medium\"));\n\n    System.out.println(\"before inference\");\n    System.out.println(rie.getFacts());\n    System.out.println();\n\n    rie.infer(); //forward chain\n\n    System.out.println(\"after inference\");\n    System.out.println(rie.getFacts());\n    System.out.println();\n}\n```\n\n## Search for answer to a question using backward chaining\n\n```java\npublic void testBackwardChain()\n{\n    RuleInferenceEngine rie=getInferenceEngine();\n    rie.addFact(new EqualsClause(\"num_wheels\", \"4\"));\n    rie.addFact(new EqualsClause(\"motor\", \"yes\"));\n    rie.addFact(new EqualsClause(\"num_doors\", \"3\"));\n    rie.addFact(new EqualsClause(\"size\", \"medium\"));\n\n    System.out.println(\"Infer: vehicle\");\n\n    Vector\u003cClause\u003e unproved_conditions= new Vector\u003c\u003e();\n\n    Clause conclusion=rie.infer(\"vehicle\", unproved_conditions);\n\n    System.out.println(\"Conclusion: \"+conclusion);\n}\n```\n\n## Ask more questions when no sufficient facts are present\n\n```java\npublic void demoBackwardChainWithNullMemory()\n{\n    RuleInferenceEngine rie=getInferenceEngine();\n\n    System.out.println(\"Infer with All Facts Cleared:\");\n    rie.clearFacts();\n\n    Vector\u003cClause\u003e unproved_conditions= new Vector\u003c\u003e();\n\n    Clause conclusion=null;\n    while(conclusion==null)\n    {\n        conclusion=rie.infer(\"vehicle\", unproved_conditions);\n        if(conclusion==null)\n        {\n            if(unproved_conditions.size()==0)\n            {\n                break;\n            }\n            Clause c=unproved_conditions.get(0);\n            System.out.println(\"ask: \"+c+\"?\");\n            unproved_conditions.clear();\n            String value=showInputDialog(\"What is \"+c.getVariable()+\"?\");\n            rie.addFact(new EqualsClause(c.getVariable(), value));\n        }\n    }\n\n    System.out.println(\"Conclusion: \"+conclusion);\n    System.out.println(\"Memory: \");\n    System.out.println(rie.getFacts());\n}\n\nprivate String showInputDialog(String question) {\n    Scanner scanner = new Scanner(System.in);\n    System.out.print(question + \" \");\n    return scanner.next();\n}\n```\n\n## Running rule engine using rules defined in a Javascript\n\nBelow is an example of a rules file written in Javascript (vehicle-rules.js)\n\n\n```javascript\nexpert.newRule(\"Bicycle\")\n    .ifEquals(\"vehicleType\", \"cycle\")\n    .andEquals(\"num_wheels\", 2)\n    .andEquals(\"motor\", \"no\")\n    .thenEquals(\"vehicle\", \"Bicycle\")\n    .build();\n\nexpert.newRule(\"Tricycle\")\n    .ifEquals(\"vehicleType\", \"cycle\")\n    .andEquals(\"num_wheels\", 3)\n    .andEquals(\"motor\", \"no\")\n    .thenEquals(\"vehicle\", \"Tricycle\")\n    .build();\n\nexpert.newRule(\"Motorcycle\")\n    .ifEquals(\"vehicleType\", \"cycle\")\n    .andEquals(\"num_wheels\", 2)\n    .andEquals(\"motor\", \"yes\")\n    .thenEquals(\"vehicle\", \"Motorcycle\")\n    .build();\n\nexpert.newRule(\"SportsCar\")\n    .ifEquals(\"vehicleType\", \"automobile\")\n    .andEquals(\"size\", \"medium\")\n    .andEquals(\"num_doors\", 2)\n    .thenEquals(\"vehicle\", \"Sports_Car\")\n    .build();\n\nexpert.newRule(\"Sedan\")\n    .ifEquals(\"vehicleType\", \"automobile\")\n    .andEquals(\"size\", \"medium\")\n    .andEquals(\"num_doors\", 4)\n    .thenEquals(\"vehicle\", \"Sedan\")\n    .build();\n\nexpert.newRule(\"MiniVan\")\n    .ifEquals(\"vehicleType\", \"automobile\")\n    .andEquals(\"size\", \"medium\")\n    .andEquals(\"num_doors\", 3)\n    .thenEquals(\"vehicle\", \"MiniVan\")\n    .build();\n\nexpert.newRule(\"SUV\")\n    .ifEquals(\"vehicleType\", \"automobile\")\n    .andEquals(\"size\", \"large\")\n    .andEquals(\"num_doors\", 4)\n    .thenEquals(\"vehicle\", \"SUV\")\n    .build();\n\nexpert.newRule(\"Cycle\")\n    .ifLess(\"num_wheels\", 4)\n    .thenEquals(\"vehicleType\", \"cycle\")\n    .build();\n\nexpert.newRule(\"Automobile\")\n    .ifEquals(\"num_wheels\", 4)\n    .andEquals(\"motor\", \"yes\")\n    .thenEquals(\"vehicleType\", \"automobile\")\n    .build();\n```\n\nThe rule engine can then load these rules into its shell and run:\n\n```java\nJSRuleInferenceEngine engine = new JSRuleInferenceEngine();\nString jsContent = readToEnd(\"/vehicle-rules.js\");\nengine.loadString(jsContent);\nengine.buildRules();\n\nengine.clearFacts();\n\nengine.addFact(\"num_wheels\", \"4\");\nengine.addFact(\"motor\", \"yes\");\nengine.addFact(\"num_doors\", \"3\");\nengine.addFact(\"size\", \"medium\");\n\n\n\nSystem.out.println(\"before inference\");\nSystem.out.println(engine.getKnowledgeBase());\nSystem.out.println();\n\n\n\nengine.infer(); //forward chain\n\nSystem.out.println(\"after inference\");\nSystem.out.println(engine.getKnowledgeBase());\nSystem.out.println();\n```","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fcschen1205%2Fjava-expert-system-shell","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fcschen1205%2Fjava-expert-system-shell","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fcschen1205%2Fjava-expert-system-shell/lists"}