net.sf.jasperreports.engine.json.expression.JsonQLExpressionEvaluator Maven / Gradle / Ivy
/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2016 TIBCO Software Inc. All rights reserved.
* http://www.jaspersoft.com
*
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* the following license terms apply:
*
* This program is part of JasperReports.
*
* JasperReports is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
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* JasperReports is distributed in the hope that it will be useful,
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
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* along with JasperReports. If not, see .
*/
package net.sf.jasperreports.engine.json.expression;
import java.util.List;
import net.sf.jasperreports.engine.json.JRJsonNode;
import net.sf.jasperreports.engine.json.JsonNodeContainer;
import net.sf.jasperreports.engine.json.expression.filter.evaluation.DefaultFilterExpressionEvaluatorVisitor;
import net.sf.jasperreports.engine.json.expression.filter.evaluation.FilterExpressionEvaluatorVisitor;
import net.sf.jasperreports.engine.json.expression.member.MemberExpression;
import net.sf.jasperreports.engine.json.expression.member.evaluation.DefaultMemberExpressionEvaluatorVisitor;
import net.sf.jasperreports.engine.json.expression.member.evaluation.DefaultMemberExpressionEvaluatorVisitorForFilter;
import net.sf.jasperreports.engine.json.expression.member.evaluation.MemberExpressionEvaluatorVisitor;
import net.sf.jasperreports.engine.util.JsonUtil;
import com.fasterxml.jackson.databind.ObjectMapper;
/**
* @author Narcis Marcu ([email protected])
*/
public class JsonQLExpressionEvaluator {
private EvaluationContext evaluationContext;
public JsonQLExpressionEvaluator() {
evaluationContext = new EvaluationContext() {
@Override
public FilterExpressionEvaluatorVisitor getFilterExpressionEvaluatorVisitor() {
return new DefaultFilterExpressionEvaluatorVisitor(this);
}
@Override
public MemberExpressionEvaluatorVisitor getMemberExpressionEvaluatorVisitor() {
return new DefaultMemberExpressionEvaluatorVisitor(this);
}
@Override
public MemberExpressionEvaluatorVisitor getMemberExpressionEvaluatorVisitorForFilter() {
return new DefaultMemberExpressionEvaluatorVisitorForFilter(this);
}
@Override
public ObjectMapper getObjectMapper() {
return JsonUtil.createObjectMapper();
}
};
}
public JsonNodeContainer evaluate(JsonQLExpression expression, JRJsonNode contextNode) {
List memberExpressionList = expression.getMemberExpressionList();
JsonNodeContainer result = new JsonNodeContainer(contextNode);
if (memberExpressionList != null) {
for (MemberExpression me: memberExpressionList) {
result = me.evaluate(result, evaluationContext.getMemberExpressionEvaluatorVisitor());
if (result == null) {
return null;
}
}
}
return result;
}
public EvaluationContext getEvaluationContext() {
return evaluationContext;
}
}