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net.sf.jasperreports.engine.design.JRClassGenerator Maven / Gradle / Ivy
/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2011 Jaspersoft Corporation. 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 [email protected]
* Peter Severin - [email protected]
*/
package net.sf.jasperreports.engine.design;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.StringTokenizer;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRExpression;
import net.sf.jasperreports.engine.JRExpressionChunk;
import net.sf.jasperreports.engine.JRField;
import net.sf.jasperreports.engine.JRParameter;
import net.sf.jasperreports.engine.JRVariable;
import net.sf.jasperreports.engine.util.JRStringUtil;
/**
* @author Teodor Danciu ([email protected] )
* @version $Id: JRClassGenerator.java 5180 2012-03-29 13:23:12Z teodord $
*/
public class JRClassGenerator
{
/**
*
*/
private static final int EXPR_MAX_COUNT_PER_METHOD = 100;
protected static final String SOURCE_EXPRESSION_ID_START = "$JR_EXPR_ID=";
protected static final int SOURCE_EXPRESSION_ID_START_LENGTH = SOURCE_EXPRESSION_ID_START.length();
protected static final String SOURCE_EXPRESSION_ID_END = "$";
private static Map fieldPrefixMap;
private static Map variablePrefixMap;
private static Map methodSuffixMap;
static
{
fieldPrefixMap = new HashMap();
fieldPrefixMap.put(new Byte(JRExpression.EVALUATION_OLD), "Old");
fieldPrefixMap.put(new Byte(JRExpression.EVALUATION_ESTIMATED), "");
fieldPrefixMap.put(new Byte(JRExpression.EVALUATION_DEFAULT), "");
variablePrefixMap = new HashMap();
variablePrefixMap.put(new Byte(JRExpression.EVALUATION_OLD), "Old");
variablePrefixMap.put(new Byte(JRExpression.EVALUATION_ESTIMATED), "Estimated");
variablePrefixMap.put(new Byte(JRExpression.EVALUATION_DEFAULT), "");
methodSuffixMap = new HashMap();
methodSuffixMap.put(new Byte(JRExpression.EVALUATION_OLD), "Old");
methodSuffixMap.put(new Byte(JRExpression.EVALUATION_ESTIMATED), "Estimated");
methodSuffixMap.put(new Byte(JRExpression.EVALUATION_DEFAULT), "");
}
protected final JRSourceCompileTask sourceTask;
protected Map parametersMap;
protected Map fieldsMap;
protected Map variablesMap;
protected JRVariable[] variables;
protected JRClassGenerator(JRSourceCompileTask sourceTask)
{
this.sourceTask = sourceTask;
parametersMap = sourceTask.getParametersMap();
fieldsMap = sourceTask.getFieldsMap();
variablesMap = sourceTask.getVariablesMap();
variables = sourceTask.getVariables();
}
/**
* Generates Java source code for evaluating the expressions of a report/dataset/crosstab.
*
* @param sourceTask the source task containing data required to generate the source file
* @return the source code
* @throws JRException
*/
public static JRCompilationSourceCode generateClass(JRSourceCompileTask sourceTask) throws JRException
{
JRClassGenerator generator = new JRClassGenerator(sourceTask);
return generator.generateClass();
}
protected JRCompilationSourceCode generateClass() throws JRException
{
StringBuffer sb = new StringBuffer();
generateClassStart(sb);
generateDeclarations(sb);
generateInitMethod(sb);
generateInitParamsMethod(sb);
if (fieldsMap != null)
{
generateInitFieldsMethod(sb);
}
generateInitVarsMethod(sb);
List expressions = sourceTask.getExpressions();
sb.append(generateMethod(JRExpression.EVALUATION_DEFAULT, expressions));
if (sourceTask.isOnlyDefaultEvaluation())
{
List empty = new ArrayList();
sb.append(generateMethod(JRExpression.EVALUATION_OLD, empty));
sb.append(generateMethod(JRExpression.EVALUATION_ESTIMATED, empty));
}
else
{
sb.append(generateMethod(JRExpression.EVALUATION_OLD, expressions));
sb.append(generateMethod(JRExpression.EVALUATION_ESTIMATED, expressions));
}
sb.append("}\n");
String code = sb.toString();
JRExpression[] lineExpressions = parseSourceLines(code);
return new JRDefaultCompilationSourceCode(code, lineExpressions);
}
private void generateInitMethod(StringBuffer sb)
{
sb.append("\n");
sb.append("\n");
sb.append(" /**\n");
sb.append(" *\n");
sb.append(" */\n");
sb.append(" public void customizedInit(\n");
sb.append(" Map pm,\n");
sb.append(" Map fm,\n");
sb.append(" Map vm\n");
sb.append(" )\n");
sb.append(" {\n");
sb.append(" initParams(pm);\n");
if (fieldsMap != null)
{
sb.append(" initFields(fm);\n");
}
sb.append(" initVars(vm);\n");
sb.append(" }\n");
sb.append("\n");
sb.append("\n");
}
protected final void generateClassStart(StringBuffer sb)
{
sb.append("/*\n");
sb.append(" * Generated by JasperReports - ");
sb.append((new SimpleDateFormat()).format(new java.util.Date()));
sb.append("\n");
sb.append(" */\n");
sb.append("import net.sf.jasperreports.engine.*;\n");
sb.append("import net.sf.jasperreports.engine.fill.*;\n");
sb.append("\n");
sb.append("import java.util.*;\n");
sb.append("import java.math.*;\n");
sb.append("import java.text.*;\n");
sb.append("import java.io.*;\n");
sb.append("import java.net.*;\n");
sb.append("\n");
/* */
String[] imports = sourceTask.getImports();
if (imports != null && imports.length > 0)
{
for (int i = 0; i < imports.length; i++)
{
sb.append("import ");
sb.append(imports[i]);
sb.append(";\n");
}
}
/* */
sb.append("\n");
sb.append("\n");
sb.append("/**\n");
sb.append(" *\n");
sb.append(" */\n");
sb.append("public class ");
sb.append(sourceTask.getUnitName());
sb.append(" extends JREvaluator\n");
sb.append("{\n");
sb.append("\n");
sb.append("\n");
sb.append(" /**\n");
sb.append(" *\n");
sb.append(" */\n");
}
protected final void generateDeclarations(StringBuffer sb)
{
if (parametersMap != null && parametersMap.size() > 0)
{
Collection parameterNames = parametersMap.keySet();
for (Iterator it = parameterNames.iterator(); it.hasNext();)
{
sb.append(" private JRFillParameter parameter_");
sb.append(JRStringUtil.getJavaIdentifier(it.next()));
sb.append(" = null;\n");
}
}
if (fieldsMap != null && fieldsMap.size() > 0)
{
Collection fieldNames = fieldsMap.keySet();
for (Iterator it = fieldNames.iterator(); it.hasNext();)
{
sb.append(" private JRFillField field_");
sb.append(JRStringUtil.getJavaIdentifier(it.next()));
sb.append(" = null;\n");
}
}
if (variables != null && variables.length > 0)
{
for (int i = 0; i < variables.length; i++)
{
sb.append(" private JRFillVariable variable_");
sb.append(JRStringUtil.getJavaIdentifier(variables[i].getName()));
sb.append(" = null;\n");
}
}
}
protected final void generateInitParamsMethod(StringBuffer sb) throws JRException
{
Iterator parIt = null;
if (parametersMap != null && parametersMap.size() > 0)
{
parIt = parametersMap.keySet().iterator();
}
else
{
Set emptySet = Collections.emptySet();
parIt = emptySet.iterator();
}
generateInitParamsMethod(sb, parIt, 0);
}
protected final void generateInitFieldsMethod(StringBuffer sb) throws JRException
{
Iterator fieldIt = null;
if (fieldsMap != null && fieldsMap.size() > 0)
{
fieldIt = fieldsMap.keySet().iterator();
}
else
{
Set emptySet = Collections.emptySet();
fieldIt = emptySet.iterator();
}
generateInitFieldsMethod(sb, fieldIt, 0);
}
protected final void generateInitVarsMethod(StringBuffer sb) throws JRException
{
Iterator varIt = null;
if (variables != null && variables.length > 0)
{
varIt = Arrays.asList(variables).iterator();
}
else
{
List emptyList = Collections.emptyList();
varIt = emptyList.iterator();
}
generateInitVarsMethod(sb, varIt, 0);
}
/**
*
*/
private void generateInitParamsMethod(StringBuffer sb, Iterator it, int index) throws JRException
{
sb.append(" /**\n");
sb.append(" *\n");
sb.append(" */\n");
sb.append(" private void initParams");
if(index > 0)
{
sb.append(index);
}
sb.append("(Map pm)\n");
sb.append(" {\n");
for (int i = 0; i < EXPR_MAX_COUNT_PER_METHOD && it.hasNext(); i++)
{
String parameterName = it.next();
sb.append(" parameter_");
sb.append(JRStringUtil.getJavaIdentifier(parameterName));
sb.append(" = (JRFillParameter)pm.get(\"");
sb.append(JRStringUtil.escapeJavaStringLiteral(parameterName));
sb.append("\");\n");
}
if(it.hasNext())
{
sb.append(" initParams");
sb.append(index + 1);
sb.append("(pm);\n");
}
sb.append(" }\n");
sb.append("\n");
sb.append("\n");
if(it.hasNext())
{
generateInitParamsMethod(sb, it, index + 1);
}
}
/**
*
*/
private void generateInitFieldsMethod(StringBuffer sb, Iterator it, int index) throws JRException
{
sb.append(" /**\n");
sb.append(" *\n");
sb.append(" */\n");
sb.append(" private void initFields");
if(index > 0)
{
sb.append(index);
}
sb.append("(Map fm)\n");
sb.append(" {\n");
for (int i = 0; i < EXPR_MAX_COUNT_PER_METHOD && it.hasNext(); i++)
{
String fieldName = it.next();
sb.append(" field_");
sb.append(JRStringUtil.getJavaIdentifier(fieldName));
sb.append(" = (JRFillField)fm.get(\"");
sb.append(JRStringUtil.escapeJavaStringLiteral(fieldName));
sb.append("\");\n");
}
if(it.hasNext())
{
sb.append(" initFields");
sb.append(index + 1);
sb.append("(fm);\n");
}
sb.append(" }\n");
sb.append("\n");
sb.append("\n");
if(it.hasNext())
{
generateInitFieldsMethod(sb, it, index + 1);
}
}
/**
*
*/
private void generateInitVarsMethod(StringBuffer sb, Iterator it, int index) throws JRException
{
sb.append(" /**\n");
sb.append(" *\n");
sb.append(" */\n");
sb.append(" private void initVars");
if(index > 0)
{
sb.append(index);
}
sb.append("(Map vm)\n");
sb.append(" {\n");
for (int i = 0; i < EXPR_MAX_COUNT_PER_METHOD && it.hasNext(); i++)
{
String variableName = (it.next()).getName();
sb.append(" variable_");
sb.append(JRStringUtil.getJavaIdentifier(variableName));
sb.append(" = (JRFillVariable)vm.get(\"");
sb.append(JRStringUtil.escapeJavaStringLiteral(variableName));
sb.append("\");\n");
}
if(it.hasNext())
{
sb.append(" initVars");
sb.append(index + 1);
sb.append("(vm);\n");
}
sb.append(" }\n");
sb.append("\n");
sb.append("\n");
if(it.hasNext())
{
generateInitVarsMethod(sb, it, index + 1);
}
}
protected final String generateMethod(byte evaluationType, List expressionsList) throws JRException
{
StringBuffer sb = new StringBuffer();
if (expressionsList.size() > 0)
{
sb.append(generateMethod(expressionsList.listIterator(), 0, evaluationType));
}
else
{
/* */
sb.append(" /**\n");
sb.append(" *\n");
sb.append(" */\n");
sb.append(" public Object evaluate");
sb.append(methodSuffixMap.get(new Byte(evaluationType)));
sb.append("(int id) throws Throwable\n");
sb.append(" {\n");
sb.append(" return null;\n");
sb.append(" }\n");
sb.append("\n");
sb.append("\n");
}
return sb.toString();
}
/**
*
*/
private String generateMethod(Iterator it, int index, byte evaluationType) throws JRException
{
StringBuffer sb = new StringBuffer();
/* */
sb.append(" /**\n");
sb.append(" *\n");
sb.append(" */\n");
if (index > 0)
{
sb.append(" private Object evaluate");
sb.append(methodSuffixMap.get(new Byte(evaluationType)));
sb.append(index);
}
else
{
sb.append(" public Object evaluate");
sb.append(methodSuffixMap.get(new Byte(evaluationType)));
}
sb.append("(int id) throws Throwable\n");
sb.append(" {\n");
sb.append(" Object value = null;\n");
sb.append("\n");
sb.append(" switch (id)\n");
sb.append(" {\n");
for (int i = 0; it.hasNext() && i < EXPR_MAX_COUNT_PER_METHOD; i++)
{
JRExpression expression = it.next();
sb.append(" case ");
sb.append(sourceTask.getExpressionId(expression));
sb.append(" : \n");
sb.append(" {\n");
sb.append(" value = ");
sb.append(this.generateExpression(expression, evaluationType));
sb.append(";");
appendExpressionComment(sb, expression);
sb.append("\n");
sb.append(" break;\n");
sb.append(" }\n");
}
/* */
sb.append(" default :\n");
sb.append(" {\n");
if (it.hasNext())
{
sb.append(" value = evaluate");
sb.append(methodSuffixMap.get(new Byte(evaluationType)));
sb.append(index + 1);
sb.append("(id);\n");
}
sb.append(" }\n");
sb.append(" }\n");
sb.append(" \n");
sb.append(" return value;\n");
sb.append(" }\n");
sb.append("\n");
sb.append("\n");
if (it.hasNext())
{
sb.append(generateMethod(it, index + 1, evaluationType));
}
return sb.toString();
}
/**
*
*/
private String generateExpression(
JRExpression expression,
byte evaluationType
)
{
JRParameter jrParameter = null;
JRField jrField = null;
JRVariable jrVariable = null;
StringBuffer sb = new StringBuffer();
JRExpressionChunk[] chunks = expression.getChunks();
JRExpressionChunk chunk = null;
String chunkText = null;
if (chunks != null && chunks.length > 0)
{
for(int i = 0; i < chunks.length; i++)
{
chunk = chunks[i];
chunkText = chunk.getText();
if (chunkText == null)
{
chunkText = "";
}
switch (chunk.getType())
{
case JRExpressionChunk.TYPE_TEXT :
{
appendExpressionText(expression, sb, chunkText);
break;
}
case JRExpressionChunk.TYPE_PARAMETER :
{
jrParameter = parametersMap.get(chunkText);
sb.append("((");
sb.append(jrParameter.getValueClassName());
sb.append(")parameter_");
sb.append(JRStringUtil.getJavaIdentifier(chunkText));
sb.append(".getValue())");
break;
}
case JRExpressionChunk.TYPE_FIELD :
{
jrField = fieldsMap.get(chunkText);
sb.append("((");
sb.append(jrField.getValueClassName());
sb.append(")field_");
sb.append(JRStringUtil.getJavaIdentifier(chunkText));
sb.append(".get");
sb.append(fieldPrefixMap.get(new Byte(evaluationType)));
sb.append("Value())");
break;
}
case JRExpressionChunk.TYPE_VARIABLE :
{
jrVariable = variablesMap.get(chunkText);
sb.append("((");
sb.append(jrVariable.getValueClassName());
sb.append(")variable_");
sb.append(JRStringUtil.getJavaIdentifier(chunkText));
sb.append(".get");
sb.append(variablePrefixMap.get(new Byte(evaluationType)));
sb.append("Value())");
break;
}
case JRExpressionChunk.TYPE_RESOURCE :
{
sb.append("str(\"");
sb.append(chunkText);
sb.append("\")");
break;
}
}
}
}
if (sb.length() == 0)
{
sb.append("null");
}
return sb.toString();
}
protected void appendExpressionText(JRExpression expression, StringBuffer sb, String chunkText)
{
for (StringTokenizer tokenizer = new StringTokenizer(chunkText, "\n", true);
tokenizer.hasMoreTokens();)
{
String token = tokenizer.nextToken();
if (token.equals("\n"))
{
appendExpressionComment(sb, expression);
}
sb.append(token);
}
}
protected void appendExpressionComment(StringBuffer sb, JRExpression expression)
{
sb.append(" //");
sb.append(SOURCE_EXPRESSION_ID_START);
sb.append(sourceTask.getExpressionId(expression));
sb.append(SOURCE_EXPRESSION_ID_END);
}
protected JRExpression[] parseSourceLines(String sourceCode)
{
List expressions = new ArrayList();
int start = 0;
int end = sourceCode.indexOf('\n');
while (end >= 0)
{
JRExpression expression = null;
if (start < end)
{
String line = sourceCode.substring(start, end);
expression = getLineExpression(line);
}
expressions.add(expression);
start = end + 1;
end = sourceCode.indexOf('\n', start);
}
return expressions.toArray(new JRExpression[expressions.size()]);
}
protected JRExpression getLineExpression(String line)
{
JRExpression expression = null;
int exprIdStart = line.indexOf(SOURCE_EXPRESSION_ID_START);
if (exprIdStart >= 0)
{
exprIdStart += SOURCE_EXPRESSION_ID_START_LENGTH;
int exprIdEnd = line.indexOf('$', exprIdStart);
if (exprIdEnd >= 0)
{
try
{
int exprId = Integer.parseInt(line.substring(exprIdStart, exprIdEnd));
expression = sourceTask.getExpression(exprId);
}
catch (NumberFormatException e)
{
// ignore
}
}
}
return expression;
}
}
