////////////////////////////////////////////////////////////////////////////////
// checkstyle: Checks Java source code for adherence to a set of rules.
// Copyright (C) 2001-2017 the original author or authors.
//
// This library 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 2.1 of the License, or (at your option) any later version.
//
// This library 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 this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
////////////////////////////////////////////////////////////////////////////////
package com.puppycrawl.tools.checkstyle.filters;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URI;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.regex.PatternSyntaxException;
import javax.xml.parsers.ParserConfigurationException;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import com.puppycrawl.tools.checkstyle.api.AbstractLoader;
import com.puppycrawl.tools.checkstyle.api.CheckstyleException;
import com.puppycrawl.tools.checkstyle.api.FilterSet;
import com.puppycrawl.tools.checkstyle.utils.CommonUtils;
/**
* Loads a filter chain of suppressions.
* @author Rick Giles
*/
public final class SuppressionsLoader
extends AbstractLoader {
/** The public ID for the configuration dtd. */
private static final String DTD_PUBLIC_ID_1_0 =
"-//Puppy Crawl//DTD Suppressions 1.0//EN";
/** The resource for the configuration dtd. */
private static final String DTD_RESOURCE_NAME_1_0 =
"com/puppycrawl/tools/checkstyle/suppressions_1_0.dtd";
/** The public ID for the configuration dtd. */
private static final String DTD_PUBLIC_ID_1_1 =
"-//Puppy Crawl//DTD Suppressions 1.1//EN";
/** The resource for the configuration dtd. */
private static final String DTD_RESOURCE_NAME_1_1 =
"com/puppycrawl/tools/checkstyle/suppressions_1_1.dtd";
/** File search error message. **/
private static final String UNABLE_TO_FIND_ERROR_MESSAGE = "Unable to find: ";
/**
* The filter chain to return in getAFilterChain(),
* configured during parsing.
*/
private final FilterSet filterChain = new FilterSet();
/**
* Creates a new {@code SuppressionsLoader} instance.
* @throws ParserConfigurationException if an error occurs
* @throws SAXException if an error occurs
*/
private SuppressionsLoader()
throws ParserConfigurationException, SAXException {
super(createIdToResourceNameMap());
}
@Override
public void startElement(String namespaceUri,
String localName,
String qName,
Attributes attributes)
throws SAXException {
if ("suppress".equals(qName)) {
//add SuppressElement filter to the filter chain
final String checks = attributes.getValue("checks");
final String modId = attributes.getValue("id");
if (checks == null && modId == null) {
// -@cs[IllegalInstantiation] SAXException is in the overridden method signature
throw new SAXException("missing checks and id attribute");
}
final SuppressElement suppress;
try {
final String files = attributes.getValue("files");
suppress = new SuppressElement(files);
if (modId != null) {
suppress.setModuleId(modId);
}
if (checks != null) {
suppress.setChecks(checks);
}
}
catch (final PatternSyntaxException ex) {
// -@cs[IllegalInstantiation] SAXException is in the overridden method signature
throw new SAXException("invalid files or checks format", ex);
}
final String lines = attributes.getValue("lines");
if (lines != null) {
suppress.setLines(lines);
}
final String columns = attributes.getValue("columns");
if (columns != null) {
suppress.setColumns(columns);
}
filterChain.addFilter(suppress);
}
}
/**
* Returns the suppression filters in a specified file.
* @param filename name of the suppressions file.
* @return the filter chain of suppression elements specified in the file.
* @throws CheckstyleException if an error occurs.
*/
public static FilterSet loadSuppressions(String filename)
throws CheckstyleException {
// figure out if this is a File or a URL
final URI uri = CommonUtils.getUriByFilename(filename);
final InputSource source = new InputSource(uri.toString());
return loadSuppressions(source, filename);
}
/**
* Returns the suppression filters in a specified source.
* @param source the source for the suppressions.
* @param sourceName the name of the source.
* @return the filter chain of suppression elements in source.
* @throws CheckstyleException if an error occurs.
*/
private static FilterSet loadSuppressions(
InputSource source, String sourceName)
throws CheckstyleException {
try {
final SuppressionsLoader suppressionsLoader =
new SuppressionsLoader();
suppressionsLoader.parseInputSource(source);
return suppressionsLoader.filterChain;
}
catch (final FileNotFoundException ex) {
throw new CheckstyleException(UNABLE_TO_FIND_ERROR_MESSAGE + sourceName, ex);
}
catch (final ParserConfigurationException | SAXException ex) {
final String message = String.format(Locale.ROOT, "Unable to parse %s - %s",
sourceName, ex.getMessage());
throw new CheckstyleException(message, ex);
}
catch (final IOException ex) {
throw new CheckstyleException("Unable to read " + sourceName, ex);
}
catch (final NumberFormatException ex) {
final String message = String.format(Locale.ROOT, "Number format exception %s - %s",
sourceName, ex.getMessage());
throw new CheckstyleException(message, ex);
}
}
/**
* Creates mapping between local resources and dtd ids.
* @return map between local resources and dtd ids.
*/
private static Map<String, String> createIdToResourceNameMap() {
final Map<String, String> map = new HashMap<>();
map.put(DTD_PUBLIC_ID_1_0, DTD_RESOURCE_NAME_1_0);
map.put(DTD_PUBLIC_ID_1_1, DTD_RESOURCE_NAME_1_1);
return map;
}
}