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Free Java Reporting Library
/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2019 TIBCO Software Inc. All rights reserved.
* http://www.jaspersoft.com
*
* Unless you have purchased a commercial license agreement from Jaspersoft,
* 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.
*
* JasperReports is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with JasperReports. If not, see .
*/
package net.sf.jasperreports.engine.json.expression.member.evaluation;
import java.util.ArrayList;
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.EvaluationContext;
import net.sf.jasperreports.engine.json.expression.member.MemberExpression;
import net.sf.jasperreports.engine.json.expression.member.MultiLevelUpExpression;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* @author Narcis Marcu ([email protected])
*/
public class MultiLevelUpExpressionEvaluator extends AbstractMemberExpressionEvaluator {
private static final Log log = LogFactory.getLog(MultiLevelUpExpressionEvaluator.class);
private MultiLevelUpExpression expression;
public MultiLevelUpExpressionEvaluator(EvaluationContext evaluationContext, MultiLevelUpExpression expression) {
super(evaluationContext);
this.expression = expression;
}
@Override
public JsonNodeContainer evaluate(JsonNodeContainer contextNode) {
List nodes = contextNode.getNodes();
if (log.isDebugEnabled()) {
log.debug("---> evaluating expression [" + expression +
"] on a node with (size: " + contextNode.getSize() +
", cSize: " + contextNode.getContainerSize() + ")");
}
JsonNodeContainer result = new JsonNodeContainer();
List uniqueParents = new ArrayList<>();
for (JRJsonNode node: nodes) {
JRJsonNode parent = getParent(node);
if (parent != null && !uniqueParents.contains(parent)) {
uniqueParents.add(parent);
if (applyFilter(parent)) {
result.add(parent);
}
}
}
if (result.getSize() > 0) {
return result;
}
return null;
}
@Override
public MemberExpression getMemberExpression() {
return expression;
}
private JRJsonNode getParent(JRJsonNode jrJsonNode) {
JRJsonNode result = jrJsonNode;
int level = expression.getLevel();
for(int i=0; i < level; i++) {
result = result.getParent();
if (result == null) {
return null;
}
}
return result;
}
}