org.apache.jasper.compiler.JavacErrorDetail Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jasper.compiler;
import static org.apache.jasper.JasperMessages.MESSAGES;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import org.apache.jasper.JspCompilationContext;
/**
* Class providing details about a javac compilation error.
*
* @author Jan Luehe
* @author Kin-man Chung
*/
public class JavacErrorDetail {
private final String javaFileName;
private final int javaLineNum;
private final String jspFileName;
private int jspBeginLineNum;
private final StringBuilder errMsg;
private String jspExtract = null;
/**
* Constructor.
*
* @param javaFileName The name of the Java file in which the
* compilation error occurred
* @param javaLineNum The compilation error line number
* @param errMsg The compilation error message
*/
public JavacErrorDetail(String javaFileName,
int javaLineNum,
StringBuilder errMsg) {
this(javaFileName, javaLineNum, null, -1, errMsg, null);
}
/**
* Constructor.
*
* @param javaFileName The name of the Java file in which the
* compilation error occurred
* @param javaLineNum The compilation error line number
* @param jspFileName The name of the JSP file from which the Java source
* file was generated
* @param jspBeginLineNum The start line number of the JSP element
* responsible for the compilation error
* @param errMsg The compilation error message
* @param ctxt The compilation context
*/
public JavacErrorDetail(String javaFileName,
int javaLineNum,
String jspFileName,
int jspBeginLineNum,
StringBuilder errMsg,
JspCompilationContext ctxt) {
this.javaFileName = javaFileName;
this.javaLineNum = javaLineNum;
this.errMsg = errMsg;
this.jspFileName = jspFileName;
// Note: this.jspBeginLineNum is set at the end of this method as it may
// be modified (corrected) during the execution of this method
if (jspBeginLineNum > 0 && ctxt != null) {
try (InputStream is = ctxt.getResourceAsStream(jspFileName)) {
// Read both files in, so we can inspect them
String[] jspLines = readFile(is);
try (FileInputStream fis = new FileInputStream(ctxt.getServletJavaFileName())) {
String[] javaLines = readFile(fis);
if (jspLines.length < jspBeginLineNum) {
// Avoid ArrayIndexOutOfBoundsException
// Probably bug 48498 but could be some other cause
jspExtract = MESSAGES.errorDisplayingJspExtract();
return;
}
// If the line contains the opening of a multi-line scriptlet
// block, then the JSP line number we got back is probably
// faulty. Scan forward to match the java line...
if (jspLines[jspBeginLineNum-1].lastIndexOf("<%") >
jspLines[jspBeginLineNum-1].lastIndexOf("%>")) {
String javaLine = javaLines[javaLineNum-1].trim();
for (int i=jspBeginLineNum-1; i lines = new ArrayList<>();
String line;
while ( (line = reader.readLine()) != null ) {
lines.add(line);
}
return lines.toArray( new String[lines.size()] );
}
}