org.owasp.dependencycheck.utils.FileFilterBuilder Maven / Gradle / Ivy
/*
* This file is part of dependency-check-core.
*
* Licensed 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.
*
* Copyright (c) 2015 Institute for Defense Analyses. All Rights Reserved.
*/
package org.owasp.dependencycheck.utils;
import org.apache.commons.io.IOCase;
import org.apache.commons.io.filefilter.IOFileFilter;
import org.apache.commons.io.filefilter.NameFileFilter;
import org.apache.commons.io.filefilter.OrFileFilter;
import org.apache.commons.io.filefilter.SuffixFileFilter;
import java.io.FileFilter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import javax.annotation.concurrent.NotThreadSafe;
/**
*
* Utility class for building useful {@link FileFilter} instances for
* {@link org.owasp.dependencycheck.analyzer.AbstractFileTypeAnalyzer} implementations. The built filter uses {@link OrFileFilter}
* to logically OR the given filter conditions. Example usage:
*
*
* FileFilter filter = FileFilterBuilder.newInstance().addExtensions("jar", "war").build();
*
*
* @author Dale Visser
* @see Builder pattern
*/
@NotThreadSafe
public class FileFilterBuilder {
/**
* A set of filenames to filter.
*/
private final Set filenames = new HashSet<>();
/**
* A set of extensions to filter.
*/
private final Set extensions = new HashSet<>();
/**
* An array list of file filters.
*/
private final List fileFilters = new ArrayList<>();
/**
* Create a new instance and return it. This method is for convenience in using the builder pattern within a single statement.
*
* @return a new builder instance
*/
public static FileFilterBuilder newInstance() {
return new FileFilterBuilder();
}
/**
* Add to the set of filenames to accept for analysis. Case-sensitivity is assumed.
*
* @param names one or more filenames to accept for analysis
* @return this builder
*/
public FileFilterBuilder addFilenames(String... names) {
filenames.addAll(Arrays.asList(names));
return this;
}
/**
* Add to the set of file extensions to accept for analysis. Case-insensitivity is assumed.
*
* @param extensions one or more file extensions to accept for analysis
* @return this builder
*/
public FileFilterBuilder addExtensions(String... extensions) {
return this.addExtensions(Arrays.asList(extensions));
}
/**
* Add to the set of file extensions to accept for analysis. Case-insensitivity is assumed.
*
* @param extensions one or more file extensions to accept for analysis
* @return this builder
*/
public FileFilterBuilder addExtensions(Iterable extensions) {
for (String extension : extensions) {
// Ultimately, SuffixFileFilter will be used, and the "." needs to be explicit.
this.extensions.add(extension.startsWith(".") ? extension : "." + extension);
}
return this;
}
/**
* Add to a list of {@link IOFileFilter} instances to consult for whether to accept a file for analysis.
*
* @param filters one or more file filters to consult for whether to accept for analysis
* @return this builder
*/
public FileFilterBuilder addFileFilters(IOFileFilter... filters) {
fileFilters.addAll(Arrays.asList(filters));
return this;
}
/**
* Builds the filter and returns it.
*
* @return a filter that is the logical OR of all the conditions provided by the add... methods
* @throws IllegalStateException if no add... method has been called with one or more arguments
*/
public FileFilter build() {
if (filenames.isEmpty() && extensions.isEmpty() && fileFilters.isEmpty()) {
throw new IllegalStateException("May only be invoked after at least one add... method has been invoked.");
}
final OrFileFilter filter = new OrFileFilter();
if (!filenames.isEmpty()) {
filter.addFileFilter(new NameFileFilter(new ArrayList<>(filenames)));
}
if (!extensions.isEmpty()) {
filter.addFileFilter(new SuffixFileFilter(new ArrayList<>(extensions), IOCase.INSENSITIVE));
}
for (IOFileFilter iof : fileFilters) {
filter.addFileFilter(iof);
}
return filter;
}
}