| // Copyright 2013 The Apache Software Foundation |
| // |
| // 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. |
| |
| package org.apache.tapestry5.internal.webresources; |
| |
| import org.apache.tapestry5.ioc.Resource; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.zip.Adler32; |
| |
| /** |
| * @since 5.4 |
| */ |
| public class ResourceTransformUtils |
| { |
| private static final double NANOS_TO_MILLIS = 1.0d / 1000000.0d; |
| |
| public static double nanosToMillis(long nanos) |
| { |
| return ((double) nanos) * NANOS_TO_MILLIS; |
| } |
| |
| public static long toChecksum(Resource resource) |
| { |
| Adler32 checksum = new Adler32(); |
| |
| byte[] buffer = new byte[1024]; |
| |
| InputStream is = null; |
| |
| try |
| { |
| is = resource.openStream(); |
| |
| while (true) |
| { |
| int length = is.read(buffer); |
| |
| if (length < 0) |
| { |
| break; |
| } |
| |
| checksum.update(buffer, 0, length); |
| } |
| |
| is.close(); |
| |
| // Reduces it down to just 32 bits which we express in hex.' |
| return checksum.getValue(); |
| } catch (IOException ex) |
| { |
| throw new RuntimeException(ex); |
| } |
| } |
| } |