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/*******************************************************************************
* Copyright (c) 2009, 2017 Mountainminds GmbH & Co. KG and Contributors
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Marc R. Hoffmann - initial API and implementation
*
*******************************************************************************/
package org.jacoco.core.test.validation;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.Reader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Reads a single source file and allows access to it through special probe
* comments in the following format <code>//$line-<i>tag</i>$.
*/
public class Source {
/**
* Reads the source for the given type from the given source folder relative
* to the working directory.
*
* @param srcFolder
* source folder
* @param type
* type to load the source file for
*/
public static Source getSourceFor(final String srcFolder,
final Class<?> type) throws IOException {
File folder = new File(srcFolder);
File file = new File(folder, type.getName().replace('.', '/') + ".java");
return new Source(new FileReader(file));
}
private static final Pattern TAG_PATTERN = Pattern
.compile("\\$line-(.*)\\$");
private final List<String> lines = new ArrayList<String>();
private final Map<String, Integer> tags = new HashMap<String, Integer>();
/**
* Reads a source file from the given reader.
*
* @param reader
* @throws IOException
*/
public Source(final Reader reader) throws IOException {
final BufferedReader buffer = new BufferedReader(reader);
for (String l = buffer.readLine(); l != null; l = buffer.readLine()) {
addLine(l);
}
buffer.close();
}
private void addLine(final String l) {
lines.add(l);
final Matcher m = TAG_PATTERN.matcher(l);
if (m.find()) {
final String tag = m.group(1);
if (tags.put(tag, Integer.valueOf(lines.size())) != null) {
throw new IllegalArgumentException("Duplicate tag: " + tag);
}
}
}
/**
* Returns all lines of the source file as a list.
*
* @return all lines of the source file
*/
public List<String> getLines() {
return Collections.unmodifiableList(lines);
}
/**
* Returns the line with the given number
*
* @param nr
* line number (first line is 1)
* @return line content
*/
public String getLine(int nr) {
return lines.get(nr - 1);
}
/**
* Returns the line number with the given tag
*
* @param tag
* tag from a <code>//$line-<i>tag</i>$ marker
* @return line number (first line is 1)
* @throws NoSuchElementException
* if there is no such tag
*/
public int getLineNumber(String tag) throws NoSuchElementException {
final Integer nr = tags.get(tag);
if (nr == null) {
throw new NoSuchElementException("Unknown tag: " + tag);
}
return nr.intValue();
}
}
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