001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.camel.component.file;
018
019 import java.util.Comparator;
020
021 import org.apache.camel.CamelContext;
022 import org.apache.camel.Exchange;
023 import org.apache.camel.Expression;
024 import org.apache.camel.spi.Language;
025 import org.apache.camel.util.ObjectHelper;
026
027 /**
028 * Default file sorter.
029 */
030 public final class GenericFileDefaultSorter {
031
032 private GenericFileDefaultSorter() {
033 }
034
035 /**
036 * Returns a new sort by name
037 */
038 public static Comparator<GenericFile<?>> sortByName(final boolean reverse) {
039 return new Comparator<GenericFile<?>>() {
040 public int compare(GenericFile<?> o1, GenericFile<?> o2) {
041 int answer = o1.getFileName().compareTo(o2.getFileName());
042 return reverse ? -1 * answer : answer;
043 }
044 };
045 }
046
047 /**
048 * Returns a new sort by path name
049 */
050 public static Comparator<GenericFile<?>> sortByPathName(final boolean reverse) {
051 return new Comparator<GenericFile<?>>() {
052 public int compare(GenericFile<?> o1, GenericFile<?> o2) {
053 int answer = o1.getParent().compareTo(o2.getParent());
054 return reverse ? -1 * answer : answer;
055 }
056 };
057 }
058
059 /**
060 * Returns a new sort by last modified (newest first)
061 */
062 public static Comparator<GenericFile<?>> sortByLastModified(
063 final boolean reverse) {
064 return new Comparator<GenericFile<?>>() {
065 public int compare(GenericFile<?> o1, GenericFile<?> o2) {
066 long delta = o1.getLastModified() - o2.getLastModified();
067 if (delta == 0) {
068 return 0;
069 }
070 int answer = delta > 0 ? 1 : -1;
071 return reverse ? -1 * answer : answer;
072 }
073 };
074 }
075
076 /**
077 * Returns a new sort by file size (smallest first)
078 */
079 public static Comparator<GenericFile<?>> sortBySize(final boolean reverse) {
080 return new Comparator<GenericFile<?>>() {
081 public int compare(GenericFile<?> o1, GenericFile<?> o2) {
082 long delta = o1.getFileLength() - o2.getFileLength();
083 if (delta == 0) {
084 return 0;
085 }
086 int answer = delta > 0 ? 1 : -1;
087 return reverse ? -1 * answer : answer;
088 }
089 };
090 }
091
092 /**
093 * Returns a new sory by file language expression
094 *
095 * @param context the camel context
096 * @param expression the file language expression
097 * @param reverse true to reverse order
098 * @return the comparator
099 */
100 public static Comparator<Exchange> sortByFileLanguage(
101 CamelContext context, String expression, boolean reverse) {
102 return sortByFileLanguage(context, expression, reverse, false, null);
103 }
104
105 /**
106 * Returns a new sory by file language expression
107 *
108 * @param context the camel context
109 * @param expression the file language expression
110 * @param reverse true to reverse order
111 * @param ignoreCase ignore case if comparing strings
112 * @return the comparator
113 */
114 public static Comparator<Exchange> sortByFileLanguage(
115 CamelContext context, String expression, boolean reverse, boolean ignoreCase) {
116 return sortByFileLanguage(context, expression, reverse, ignoreCase, null);
117 }
118
119 /**
120 * Returns a new sort by file language expression
121 *
122 * @param context the camel context
123 * @param expression the file language expression
124 * @param reverse true to reverse order
125 * @param ignoreCase ignore case if comparing strings
126 * @param nested nested comparator for sub group sorting, can be null
127 * @return the comparator
128 */
129 public static Comparator<Exchange> sortByFileLanguage(
130 final CamelContext context, final String expression, final boolean reverse,
131 final boolean ignoreCase, final Comparator<Exchange> nested) {
132
133 // the expression should be enclosed by ${ }
134 String text = expression;
135 if (!expression.startsWith("${")) {
136 text = "${" + text;
137 }
138 if (!expression.endsWith("}")) {
139 text = text + "}";
140 }
141 Language language = context.resolveLanguage("file");
142 final Expression exp = language.createExpression(text);
143
144 return new Comparator<Exchange>() {
145 public int compare(Exchange o1, Exchange o2) {
146 Object result1 = exp.evaluate(o1, Object.class);
147 Object result2 = exp.evaluate(o2, Object.class);
148 int answer = ObjectHelper.compare(result1, result2, ignoreCase);
149 // if equal then sub sort by nested comparator
150 if (answer == 0 && nested != null) {
151 answer = nested.compare(o1, o2);
152 }
153 return reverse ? -1 * answer : answer;
154 }
155
156 public String toString() {
157 return expression + (nested != null ? ";" + nested.toString() : "");
158 }
159 };
160 }
161
162 }