| /* |
| * 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.ivy.util.filter; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.apache.ivy.core.module.descriptor.Artifact; |
| |
| public final class FilterHelper { |
| private FilterHelper() { |
| } |
| |
| public static final Filter<Artifact> NO_FILTER = NoFilter.instance(); |
| |
| public static Filter<Artifact> getArtifactTypeFilter(String types) { |
| if (types == null || types.trim().equals("*")) { |
| return NO_FILTER; |
| } |
| String[] t = types.split(","); |
| return getArtifactTypeFilter(t); |
| } |
| |
| public static Filter<Artifact> getArtifactTypeFilter(String[] types) { |
| if (types == null || types.length == 0) { |
| return NO_FILTER; |
| } |
| List<String> acceptedTypes = new ArrayList<String>(types.length); |
| for (int i = 0; i < types.length; i++) { |
| String current = types[i].trim(); |
| if ("*".equals(current)) { |
| return NO_FILTER; |
| } |
| acceptedTypes.add(current); |
| } |
| return new ArtifactTypeFilter(acceptedTypes); |
| } |
| |
| /** |
| * Returns a new collection containing only the items from the given collectoin, which are |
| * accepted by the filter. |
| * |
| * @param col |
| * The collection to filter. |
| * @param filter |
| * The filter to use. |
| * @return A new collection instance containing the only the instance accepted by the filter. |
| * |
| * <br /> |
| * Comment: We could have used <a |
| * href="http://jakarta.apache.org/commons/collections/">Commons-Collections</a> |
| * facility for this. If we accepted to add dependencies on third party jars. |
| */ |
| public static <T> Collection<T> filter(Collection<T> col, Filter<T> filter) { |
| if (filter == null) { |
| return col; |
| } |
| Collection<T> ret = new ArrayList<T>(col); |
| for (Iterator<T> iter = ret.iterator(); iter.hasNext();) { |
| T element = iter.next(); |
| if (!filter.accept(element)) { |
| iter.remove(); |
| } |
| } |
| return ret; |
| } |
| } |