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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.compilers;
import java.util.HashMap;
import java.util.Map;
import org.apache.commons.collections4.map.ReferenceMap;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.mozilla.javascript.Script;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperReportsContext;
import net.sf.jasperreports.engine.fill.JREvaluator;
import net.sf.jasperreports.engine.fill.JRFillField;
import net.sf.jasperreports.engine.fill.JRFillParameter;
import net.sf.jasperreports.engine.fill.JRFillVariable;
import net.sf.jasperreports.engine.fill.JasperReportsContextAware;
import net.sf.jasperreports.functions.FunctionsUtil;
/**
* JavaScript expression evaluator that uses Java bytecode compiled by {@link JavaScriptClassCompiler}.
*
* @author Lucian Chirita ([email protected])
*/
public class JavaScriptCompiledEvaluator extends JREvaluator implements JasperReportsContextAware
{
private static final Log log = LogFactory.getLog(JavaScriptCompiledEvaluator.class);
protected static final String EXPRESSION_ID_VAR = "_jreid";
private static final ReferenceMap scriptClassLoaders =
new ReferenceMap(
ReferenceMap.ReferenceStrength.HARD, ReferenceMap.ReferenceStrength.SOFT
);
protected static JavaScriptClassLoader getScriptClassLoader(String unitName)
{
JavaScriptClassLoader loader;
boolean created = false;
synchronized (scriptClassLoaders)
{
loader = scriptClassLoaders.get(unitName);
if (loader == null)
{
loader = new JavaScriptClassLoader();
scriptClassLoaders.put(unitName, loader);
created = true;
}
}
if (created && log.isDebugEnabled())
{
log.debug("created script class loader " + loader + " for " + unitName);
}
return loader;
}
private final JasperReportsContext jasperReportsContext;
private final String unitName;
private final JavaScriptCompiledData compiledData;
private FunctionsUtil functionsUtil;
private JavaScriptEvaluatorScope evaluatorScope;
private final Map scripts = new HashMap();
/**
* Create a JavaScript expression evaluator.
*
* @param jasperReportsContext
* @param unitName
* @param compiledData the report compile data
*/
public JavaScriptCompiledEvaluator(JasperReportsContext jasperReportsContext, String unitName, JavaScriptCompiledData compiledData)
{
this.jasperReportsContext = jasperReportsContext;
this.unitName = unitName;
this.compiledData = compiledData;
}
@Override
public void setJasperReportsContext(JasperReportsContext context)
{
this.functionsUtil = FunctionsUtil.getInstance(context);
}
@Override
protected void customizedInit(
Map parametersMap,
Map fieldsMap,
Map variablesMap
) throws JRException
{
evaluatorScope = new JavaScriptEvaluatorScope(jasperReportsContext, this, functionsUtil);
evaluatorScope.init(parametersMap, fieldsMap, variablesMap);
}
@Override
protected Object evaluate(int id) throws Throwable //NOSONAR
{
JavaScriptCompiledData.ExpressionIndexes expression = getExpression(id);
return evaluateExpression(expression.getDefaultExpressionIndex());
}
@Override
protected Object evaluateEstimated(int id) throws Throwable //NOSONAR
{
JavaScriptCompiledData.ExpressionIndexes expression = getExpression(id);
return evaluateExpression(expression.getEstimatedExpressionIndex());
}
@Override
protected Object evaluateOld(int id) throws Throwable //NOSONAR
{
JavaScriptCompiledData.ExpressionIndexes expression = getExpression(id);
return evaluateExpression(expression.getOldExpressionIndex());
}
protected JavaScriptCompiledData.ExpressionIndexes getExpression(int id)
{
return compiledData.getExpression(id);
}
protected Object evaluateExpression(int expressionIndex)
{
int scriptIndex = JavaScriptCompiledData.scriptIndex(expressionIndex);
Script script = scripts.get(scriptIndex);
if (script == null)
{
if (log.isTraceEnabled())
{
log.trace("creating script for expression index " + expressionIndex
+ ", script index " + scriptIndex);
}
JavaScriptClassLoader scriptClassLoader = getScriptClassLoader(unitName);
script = scriptClassLoader.createScript(scriptIndex, compiledData);
scripts.put(scriptIndex, script);
}
int expressionId = JavaScriptCompiledData.expressionId(expressionIndex);
evaluatorScope.setScopeVariable(EXPRESSION_ID_VAR, expressionId);
Object value = evaluatorScope.evaluateExpression(script);
if (log.isTraceEnabled())
{
log.trace("expression with index " + expressionIndex + ", id " + expressionId
+ " evaluated to " + value);
}
return value;
}
}