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‎.gitignore

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# Created by .ignore support plugin (hsz.mobi)
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### Java template
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*.class
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# Mobile Tools for Java (J2ME)
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.mtj.tmp/
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# Package Files #
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*.jar
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*.war
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*.ear
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# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
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hs_err_pid*
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### JetBrains template
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# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio
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*.iml
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## Directory-based project format:
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.idea/
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# if you remove the above rule, at least ignore the following:
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# User-specific stuff:
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# .idea/workspace.xml
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# .idea/tasks.xml
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# .idea/dictionaries
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# Sensitive or high-churn files:
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# .idea/dataSources.ids
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# .idea/dataSources.xml
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# .idea/sqlDataSources.xml
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# .idea/dynamic.xml
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# .idea/uiDesigner.xml
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# Gradle:
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# .idea/gradle.xml
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# .idea/libraries
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# Mongo Explorer plugin:
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# .idea/mongoSettings.xml
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## File-based project format:
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*.ipr
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*.iws
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## Plugin-specific files:
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# IntelliJ
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/out/
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# mpeltonen/sbt-idea plugin
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.idea_modules/
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# JIRA plugin
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atlassian-ide-plugin.xml
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# Crashlytics plugin (for Android Studio and IntelliJ)
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com_crashlytics_export_strings.xml
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crashlytics.properties
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crashlytics-build.properties
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target

‎pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>io.appform.rules</groupId>
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<artifactId>json-rules</artifactId>
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<version>0.1-SNAPSHOT</version>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>1.8</source>
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<target>1.8</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<properties>
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<jackson.version>2.7.4</jackson.version>
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<lombok.version>1.16.6</lombok.version>
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<junit.version>4.12</junit.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<version>${lombok.version}</version>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-core</artifactId>
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<version>${jackson.version}</version>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-databind</artifactId>
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<version>${jackson.version}</version>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.datatype</groupId>
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<artifactId>jackson-datatype-jsr310</artifactId>
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<version>${jackson.version}</version>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.datatype</groupId>
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<artifactId>jackson-datatype-jdk8</artifactId>
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<version>${jackson.version}</version>
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</dependency>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>${junit.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<profiles>
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<profile>
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<id>lombok-needs-tools-jar</id>
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<activation>
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<file>
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<exists>${java.home}/../lib/tools.jar</exists>
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</file>
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</activation>
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<build>
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<plugins>
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<plugin>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok-maven-plugin</artifactId>
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<version>1.16.4.1</version>
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<dependencies>
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<dependency>
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<groupId>sun.jdk</groupId>
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<artifactId>tools</artifactId>
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<version>1.6</version>
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<scope>system</scope>
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<systemPath>${java.home}/../lib/tools.jar</systemPath>
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</dependency>
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</dependencies>
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</plugin>
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</plugins>
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</build>
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</profile>
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</profiles>
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</project>

‎src/main/java/io/appform/jsonrules/Expression.java

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package io.appform.jsonrules;
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import com.fasterxml.jackson.annotation.JsonSubTypes;
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import com.fasterxml.jackson.annotation.JsonTypeInfo;
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import io.appform.jsonrules.expressions.composite.AndExpression;
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import io.appform.jsonrules.expressions.composite.NotExpression;
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import io.appform.jsonrules.expressions.composite.OrExpression;
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import io.appform.jsonrules.expressions.equality.EqualsExpression;
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import io.appform.jsonrules.expressions.equality.InExpression;
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import io.appform.jsonrules.expressions.equality.NotEqualsExpression;
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import io.appform.jsonrules.expressions.equality.NotInExpression;
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import io.appform.jsonrules.expressions.numeric.GreaterThanEqualsExpression;
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import io.appform.jsonrules.expressions.numeric.GreaterThanExpression;
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import io.appform.jsonrules.expressions.numeric.LessThanEqualsExpression;
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import io.appform.jsonrules.expressions.numeric.LessThanExpression;
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import lombok.Data;
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import lombok.EqualsAndHashCode;
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import lombok.ToString;
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/**
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* A base expression
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*/
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@Data
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@EqualsAndHashCode
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@ToString
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@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.EXISTING_PROPERTY, property = "type")
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@JsonSubTypes({
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@JsonSubTypes.Type(name = "equals", value = EqualsExpression.class),
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@JsonSubTypes.Type(name = "not_equals", value = NotEqualsExpression.class),
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@JsonSubTypes.Type(name = "in", value = InExpression.class),
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@JsonSubTypes.Type(name = "not_in", value = NotInExpression.class),
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@JsonSubTypes.Type(name = "greater_than", value = GreaterThanExpression.class),
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@JsonSubTypes.Type(name = "greater_than_equals", value = GreaterThanEqualsExpression.class),
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@JsonSubTypes.Type(name = "less_than", value = LessThanExpression.class),
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@JsonSubTypes.Type(name = "less_than_equals", value = LessThanEqualsExpression.class),
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@JsonSubTypes.Type(name = "and", value = AndExpression.class),
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@JsonSubTypes.Type(name = "or", value = OrExpression.class),
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@JsonSubTypes.Type(name = "not", value = NotExpression.class),
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})
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public abstract class Expression {
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private final ExpressionType type;
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protected Expression(ExpressionType type) {
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this.type = type;
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}
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abstract public boolean evaluate(ExpressionEvaluationContext context);
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}

‎src/main/java/io/appform/jsonrules/ExpressionEvaluationContext.java

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package io.appform.jsonrules;
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import com.fasterxml.jackson.databind.JsonNode;
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import lombok.AllArgsConstructor;
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import lombok.Builder;
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import lombok.Data;
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/**
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* Context passed to expression evaluator
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*/
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@Data
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@AllArgsConstructor
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@Builder
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public class ExpressionEvaluationContext {
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private byte json[];
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private JsonNode node;
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}

‎src/main/java/io/appform/jsonrules/ExpressionType.java

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package io.appform.jsonrules;
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/**
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* Types of expression
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*/
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public enum ExpressionType {
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//Equality
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equals,
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not_equals,
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in,
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not_in,
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//Numeric
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greater_than,
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less_than,
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greater_than_equals,
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less_than_equals,
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//Joiner
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and,
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or,
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not
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}

‎src/main/java/io/appform/jsonrules/Rule.java

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package io.appform.jsonrules;
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import com.fasterxml.jackson.databind.JsonNode;
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import com.fasterxml.jackson.databind.ObjectMapper;
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/**
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* A basic rule
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*/
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public class Rule {
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private final Expression expression;
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public Rule(Expression expression) {
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this.expression = expression;
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}
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public static Rule create(final String json, final ObjectMapper mapper) throws Exception {
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return new Rule(mapper.readValue(json, Expression.class));
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}
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public boolean matches(JsonNode node) {
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return expression.evaluate(
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ExpressionEvaluationContext.builder()
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.node(node)
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.build());
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}
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}

‎src/main/java/io/appform/jsonrules/RuleEngine.java

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package io.appform.jsonrules;
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/**
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* Top level rule evaluator
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*/
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public class RuleEngine {
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}

‎src/main/java/io/appform/jsonrules/expressions/JsonPathBasedExpression.java

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package io.appform.jsonrules.expressions;
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import com.fasterxml.jackson.databind.JsonNode;
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import io.appform.jsonrules.ExpressionEvaluationContext;
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import io.appform.jsonrules.Expression;
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import io.appform.jsonrules.ExpressionType;
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import lombok.Data;
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import lombok.EqualsAndHashCode;
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import lombok.ToString;
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/**
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* All expressions that evaluate a json path uses this.
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*/
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@Data
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@EqualsAndHashCode(callSuper = true)
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@ToString(callSuper = true)
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public abstract class JsonPathBasedExpression extends Expression {
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private String path;
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protected JsonPathBasedExpression(ExpressionType type) {
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super(type);
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}
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protected JsonPathBasedExpression(ExpressionType type, String path) {
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this(type);
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this.path = path;
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}
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@Override
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public final boolean evaluate(ExpressionEvaluationContext context) {
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//T value = context.getParsedContext().read(path, clazz);
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final JsonNode evaluatedNode = context.getNode().at(path);
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return evaluate(context, path, evaluatedNode);
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}
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abstract protected boolean evaluate(ExpressionEvaluationContext context, final String path, JsonNode evaluatedNode);
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}

‎src/main/java/io/appform/jsonrules/expressions/composite/AndExpression.java

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package io.appform.jsonrules.expressions.composite;
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import io.appform.jsonrules.ExpressionEvaluationContext;
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import io.appform.jsonrules.Expression;
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import io.appform.jsonrules.ExpressionType;
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import lombok.*;
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import java.util.List;
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import java.util.function.Predicate;
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/**
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* And operator
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*/
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@Data
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@EqualsAndHashCode(callSuper = true)
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@ToString(callSuper = true)
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public class AndExpression extends CompositeExpression {
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public AndExpression() {
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super(ExpressionType.and);
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}
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@Builder
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public AndExpression(ExpressionType type, @Singular List<Expression> children) {
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super(type, children);
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}
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@Override
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protected boolean evaluate(ExpressionEvaluationContext context, List<Expression> children) {
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return children.stream()
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.map(expression -> expression.evaluate(context))
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.allMatch(Predicate.isEqual(true));
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}
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}

‎src/main/java/io/appform/jsonrules/expressions/composite/CompositeExpression.java

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package io.appform.jsonrules.expressions.composite;
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import io.appform.jsonrules.ExpressionEvaluationContext;
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import io.appform.jsonrules.Expression;
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import io.appform.jsonrules.ExpressionType;
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import lombok.Data;
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import lombok.EqualsAndHashCode;
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import lombok.ToString;
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import java.util.List;
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/**
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* Expression that accepts another expression
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*/
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@Data
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@EqualsAndHashCode(callSuper = true)
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@ToString(callSuper = true)
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public abstract class CompositeExpression extends Expression {
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private List<Expression> children;
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protected CompositeExpression(ExpressionType type) {
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super(type);
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}
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protected CompositeExpression(ExpressionType type, List<Expression> children) {
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this(type);
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this.children = children;
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}
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@Override
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public final boolean evaluate(ExpressionEvaluationContext context) {
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return null != children
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&& evaluate(context, children);
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}
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protected abstract boolean evaluate(ExpressionEvaluationContext context, List<Expression> children);
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}

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