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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.ArrayDeque;
import java.util.ArrayList;
import java.util.Deque;
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.ObjectConstructionExpression;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
/**
* @author Narcis Marcu ([email protected])
*/
public class ObjectConstructionExpressionEvaluator extends AbstractMemberExpressionEvaluator {
private static final Log log = LogFactory.getLog(ObjectConstructionExpressionEvaluator.class);
private ObjectConstructionExpression expression;
public ObjectConstructionExpressionEvaluator(EvaluationContext evaluationContext, ObjectConstructionExpression expression) {
super(evaluationContext);
this.expression = expression;
}
@Override
public JsonNodeContainer evaluate(JsonNodeContainer contextNode) {
if (log.isDebugEnabled()) {
log.debug("---> evaluating expression [" + expression +
"] on a node with (size: " + contextNode.getSize() +
", cSize: " + contextNode.getContainerSize() + ")");
}
JsonNodeContainer result = new JsonNodeContainer();
switch(expression.getDirection()) {
case DOWN:
for (JRJsonNode node: contextNode.getNodes()) {
result.addNodes(goDown(node));
}
break;
case ANYWHERE_DOWN:
for (JRJsonNode node: contextNode.getNodes()) {
result.addNodes(goAnywhereDown(node));
}
break;
}
if (result.getSize() > 0) {
return result;
}
return null;
}
@Override
public MemberExpression getMemberExpression() {
return expression;
}
private List goDown(JRJsonNode jrJsonNode) {
List result = new ArrayList<>();
JsonNode dataNode = jrJsonNode.getDataNode();
// advance into object
if (dataNode.isObject()) {
JRJsonNode deeperNode = constructNewObjectNodeWithKeys(jrJsonNode);
if (deeperNode != null) {
result.add(deeperNode);
}
}
// advance into array
else if (dataNode.isArray()) {
for (JsonNode node : dataNode) {
JRJsonNode childWithKeys = constructNewObjectNodeWithKeys(jrJsonNode.createChild(node));
if (childWithKeys != null) {
result.add(childWithKeys);
}
}
}
return result;
}
private JRJsonNode constructNewObjectNodeWithKeys(JRJsonNode from) {
ObjectNode newNode = getEvaluationContext().getObjectMapper().createObjectNode();
for (String objectKey: expression.getObjectKeys()) {
JsonNode deeperNode = from.getDataNode().get(objectKey);
if (deeperNode != null && (deeperNode.isObject() || deeperNode.isValueNode() || deeperNode.isArray())) {
JRJsonNode deeperChild = from.createChild(deeperNode);
if (applyFilter(deeperChild)) {
newNode.put(objectKey, deeperNode);
}
}
}
if (newNode.size() > 0) {
return from.createChild(newNode);
}
return null;
}
private List goAnywhereDown(JRJsonNode jrJsonNode) {
List result = new ArrayList<>();
Deque stack = new ArrayDeque<>();
if (log.isDebugEnabled()) {
log.debug("initial stack population with: " + jrJsonNode.getDataNode());
}
// populate the stack initially
stack.push(jrJsonNode);
while (!stack.isEmpty()) {
JRJsonNode stackNode = stack.pop();
JsonNode stackDataNode = stackNode.getDataNode();
addChildrenToStack(stackNode, stack);
if (log.isDebugEnabled()) {
log.debug("processing stack element: " + stackDataNode);
}
// process the current stack item
if (stackDataNode.isObject()) {
JRJsonNode childWithKeys = constructNewObjectNodeWithKeys(stackNode);
if (childWithKeys != null) {
result.add(childWithKeys);
}
}
}
return result;
}
}