Deletes unused module
This commit is contained in:
Ioannis Kalyvas
parent
2bb18786b3
commit
9467d2b9ee
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<?xml version="1.0" encoding="UTF-8"?><root><dmp><dmpName>DMP Demodfgdfg</dmpName><projectName>OpenAIREplus</projectName><organisations><organisation name="Nord University" reference="organizationrepo:cristin/204"/><organisation name="Hanne Moa" reference="personrepo:orcid-sandbox/0000-0003-2050-142X"/></organisations><researchers/><datasets/></dmp></root>
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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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<parent>
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<artifactId>dmp-backend</artifactId>
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<groupId>eu.eudat</groupId>
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<version>1.0.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>query-engine</artifactId>
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<dependencies>
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<dependency>
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<groupId>eu.eudat</groupId>
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<artifactId>data</artifactId>
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<version>1.0-SNAPSHOT</version>
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</dependency>
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</dependencies>
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</project>
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import eu.eudat.data.entities.DataRepository;
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import eu.eudat.query.engine.builder.QueryBuilder;
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import eu.eudat.query.engine.builder.QueryBuilderImpl;
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import eu.eudat.query.engine.predicates.ComparisonPredicate;
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/**
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* Created by ikalyvas on 7/5/2018.
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*/
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public class Main {
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public static void main(String[] args){
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new Main().Test();
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}
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public void Test(){
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QueryBuilder<DataRepository> queryBuilder = new QueryBuilderImpl<>(DataRepository.class);
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queryBuilder.<ComparisonPredicate>where((comparisonExpression) -> comparisonExpression.field("id").greaterThan(5) );
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queryBuilder.<ComparisonPredicate>where((comparisonExpression) -> comparisonExpression.field("label").equal("mitsos") );
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queryBuilder.toList();
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QueryBuilder<DataRepository> queryBuilder2 = new QueryBuilderImpl<>(DataRepository.class);
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queryBuilder2.<ComparisonPredicate>where((comparisonExpression) -> comparisonExpression.field("id").lessOrEqualThan(11111) );
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queryBuilder2.toList();
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}
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}
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package eu.eudat.query.engine.builder;
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import eu.eudat.query.engine.expressions.Expression;
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import eu.eudat.query.engine.predicates.Predicate;
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import java.util.List;
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/**
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* Created by ikalyvas on 7/5/2018.
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*/
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public interface QueryBuilder<T> {
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<P extends Predicate> Expression where(P wherePredicate);
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List<T> toList();
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}
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package eu.eudat.query.engine.builder;
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import eu.eudat.query.engine.expressions.ComparisonExpression;
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import eu.eudat.query.engine.expressions.Expression;
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import eu.eudat.query.engine.predicates.Predicate;
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import java.lang.annotation.Annotation;
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import java.util.Arrays;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.Optional;
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/**
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* Created by ikalyvas on 7/5/2018.
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*/
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public class QueryBuilderImpl<T> implements QueryBuilder<T> {
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private List<Expression> expressions = new LinkedList<>();
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private Class<T> tClass;
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public QueryBuilderImpl(Class<T> tClass) {
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this.tClass = tClass;
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}
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@Override
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public <P extends Predicate> Expression where(P wherePredicate) {
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ComparisonExpression comparisonExpression = new ComparisonExpression();
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Expression expression = wherePredicate.apply(comparisonExpression);
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this.expressions.add(expression);
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return expression;
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}
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@Override
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public List<T> toList() {
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String query = "Select * from ";
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Optional<Annotation> optionalAnnotation = Arrays.stream(this.tClass.getAnnotations())
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.filter(x-> x.annotationType().equals(javax.persistence.Table.class))
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.findFirst();
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javax.persistence.Table annotation = optionalAnnotation.isPresent() ? (javax.persistence.Table)optionalAnnotation.get() : null;
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query += annotation.name()+" ";
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for (Expression expression : expressions) {
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if(expressions.indexOf(expression) > 0) query+= " and ";
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else query += " where ";
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query += expression.evaluate();
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}
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System.out.println(query);
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return null;
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}
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}
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package eu.eudat.query.engine.expressions;
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/**
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* Created by ikalyvas on 7/5/2018.
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*/
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public abstract class AbstractFieldExpression<T extends AbstractFieldExpression<T>> {
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private String field;
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protected String getField() {
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return field;
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}
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public T field(String field) {
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this.field = field;
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return (T)this;
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}
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}
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package eu.eudat.query.engine.expressions;
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import eu.eudat.query.engine.types.expression.comparison.ComparisonExpressionType;
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/**
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* Created by ikalyvas on 7/5/2018.
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*/
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public class ComparisonExpression extends AbstractFieldExpression<ComparisonExpression> implements Expression {
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private ComparisonExpressionType type;
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private Object value;
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public <T> Expression greaterThan(T value){
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this.value = value;
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this.type = ComparisonExpressionType.GREATER_THAN;
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return this;
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}
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public <T> Expression greaterThanOrEqual(T value){
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this.value = value;
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this.type = ComparisonExpressionType.GREATER_OR_EQUAL_THAN;
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return this;
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}
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public <T> Expression equal(T value){
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this.value = value;
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this.type = ComparisonExpressionType.EQUAL;
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return this;
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}
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public <T> Expression lessThan(T value){
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this.value = value;
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this.type = ComparisonExpressionType.LESS_THAN;
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return this;
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}
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public <T> Expression lessOrEqualThan(T value){
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this.value = value;
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this.type = ComparisonExpressionType.LESS_OR_EQUAL_THAN;
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return this;
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}
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@Override
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public String evaluate() {
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return this.getField() +" " + type.toString() + " " + value ;
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}
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}
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package eu.eudat.query.engine.expressions;
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/**
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* Created by ikalyvas on 7/5/2018.
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*/
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public interface Expression {
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String evaluate();
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}
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package eu.eudat.query.engine.predicates;
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import eu.eudat.query.engine.expressions.ComparisonExpression;
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import eu.eudat.query.engine.expressions.Expression;
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/**
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* Created by ikalyvas on 7/5/2018.
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*/
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public interface ComparisonPredicate extends Predicate<ComparisonExpression> {
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}
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package eu.eudat.query.engine.predicates;
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import eu.eudat.query.engine.expressions.ComparisonExpression;
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import eu.eudat.query.engine.expressions.Expression;
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/**
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* Created by ikalyvas on 7/5/2018.
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*/
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public interface Predicate<E extends Expression> {
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Expression apply( E expression);
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}
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package eu.eudat.query.engine.types.expression.comparison;
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/**
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* Created by ikalyvas on 7/5/2018.
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*/
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public enum ComparisonExpressionType {
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EQUAL, GREATER_THAN, GREATER_OR_EQUAL_THAN, LESS_THAN, LESS_OR_EQUAL_THAN
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}
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