/*
* 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.tools.ant.taskdefs;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.util.Enumeration;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.taskdefs.Manifest.Attribute;
import org.apache.tools.ant.types.EnumeratedAttribute;
/**
* Creates a manifest file for inclusion in a JAR, Ant task wrapper
* around {@link Manifest Manifest}. This task can be used to write a
* Manifest file, optionally replacing or updating an existing file.
*
* @since Ant 1.5
*
* @ant.task category="java"
*/
public class ManifestTask extends Task {
/**
* Specifies the valid characters which can be used in attribute names.
* {@value}
*/
public static final String VALID_ATTRIBUTE_CHARS =
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_";
/**
* Holds the real data.
*/
private Manifest nestedManifest = new Manifest();
/**
* The file to which the manifest should be written when used as a task
*/
private File manifestFile;
/**
* The mode with which the manifest file is written
*/
private Mode mode;
/**
* The encoding of the manifest file
*/
private String encoding;
/**
* whether to merge Class-Path attributes.
*/
private boolean mergeClassPaths = false;
/**
* whether to flatten Class-Path attributes into a single one.
*/
private boolean flattenClassPaths = false;
/**
* Helper class for Manifest's mode attribute.
*/
public static class Mode extends EnumeratedAttribute {
/**
* Get Allowed values for the mode attribute.
*
* @return a String array of the allowed values.
*/
@Override
public String[] getValues() {
return new String[] { "update", "replace" };
}
}
/**
* Default constructor
*/
public ManifestTask() {
mode = new Mode();
mode.setValue("replace");
}
/**
* Add a section to the manifest
*
* @param section the manifest section to be added
*
* @exception ManifestException if the section is not valid.
*/
public void addConfiguredSection(Manifest.Section section)
throws ManifestException {
Enumeration<String> attributeKeys = section.getAttributeKeys();
while (attributeKeys.hasMoreElements()) {
Attribute attribute = section.getAttribute(
attributeKeys.nextElement());
checkAttribute(attribute);
}
nestedManifest.addConfiguredSection(section);
}
/**
* Add an attribute to the manifest - it is added to the main section.
*
* @param attribute the attribute to be added.
*
* @exception ManifestException if the attribute is not valid.
*/
public void addConfiguredAttribute(Manifest.Attribute attribute)
throws ManifestException {
checkAttribute(attribute);
nestedManifest.addConfiguredAttribute(attribute);
}
/**
* Checks the attribute against the Jar-specification.
*
* Jar-Specification <i>"Name-Value pairs and Sections"</i>: <pre>
* name: alphanum *headerchar
* alphanum: {A-Z} | {a-z} | {0-9}
* headerchar: alphanum | - | _
* </pre>
* So the resulting regexp would be <tt>[A-Za-z0-9][A-Za-z0-9-_]*</tt>.
*
* Because of JDK 1.2 compliance and the possible absence of a
* regexp matcher we can not use regexps here. Instead we have to
* check each character.
*
* @param attribute The attribute to check
* @throws BuildException if the check fails
*/
private void checkAttribute(Manifest.Attribute attribute) throws BuildException {
String name = attribute.getName();
char ch = name.charAt(0);
if (ch == '-' || ch == '_') {
throw new BuildException(
"Manifest attribute names must not start with '%c'.", ch);
}
for (int i = 0; i < name.length(); i++) {
ch = name.charAt(i);
if (VALID_ATTRIBUTE_CHARS.indexOf(ch) < 0) {
throw new BuildException(
"Manifest attribute names must not contain '%c'", ch);
}
}
}
/**
* The name of the manifest file to create/update.
* Required if used as a task.
* @param f the Manifest file to be written
*/
public void setFile(File f) {
manifestFile = f;
}
/**
* The encoding to use for reading in an existing manifest file
* @param encoding the manifest file encoding.
*/
public void setEncoding(String encoding) {
this.encoding = encoding;
}
/**
* Update policy: either "update" or "replace"; default is "replace".
* @param m the mode value - update or replace.
*/
public void setMode(Mode m) {
mode = m;
}
/**
* Whether to merge Class-Path attributes.
*
* @since Ant 1.8.0
*/
public void setMergeClassPathAttributes(boolean b) {
mergeClassPaths = b;
}
/**
* Whether to flatten multi-valued attributes (i.e. Class-Path)
* into a single one.
*
* @since Ant 1.8.0
*/
public void setFlattenAttributes(boolean b) {
flattenClassPaths = b;
}
/**
* Create or update the Manifest when used as a task.
*
* @throws BuildException if the manifest cannot be written.
*/
@Override
public void execute() throws BuildException {
if (manifestFile == null) {
throw new BuildException("the file attribute is required");
}
Manifest toWrite = Manifest.getDefaultManifest();
Manifest current = null;
BuildException error = null;
if (manifestFile.exists()) {
Charset charset = Charset.forName(encoding == null ? "UTF-8" : encoding);
try (InputStreamReader isr = new InputStreamReader(
Files.newInputStream(manifestFile.toPath()), charset)) {
current = new Manifest(isr);
} catch (ManifestException m) {
error = new BuildException("Existing manifest " + manifestFile
+ " is invalid", m, getLocation());
} catch (IOException e) {
error = new BuildException("Failed to read " + manifestFile,
e, getLocation());
}
}
//look for and print warnings
for (Enumeration<String> e = nestedManifest.getWarnings();
e.hasMoreElements();) {
log("Manifest warning: " + e.nextElement(),
Project.MSG_WARN);
}
try {
if ("update".equals(mode.getValue()) && manifestFile.exists()) {
if (current != null) {
toWrite.merge(current, false, mergeClassPaths);
} else if (error != null) {
throw error;
}
}
toWrite.merge(nestedManifest, false, mergeClassPaths);
} catch (ManifestException m) {
throw new BuildException("Manifest is invalid", m, getLocation());
}
if (toWrite.equals(current)) {
log("Manifest has not changed, do not recreate",
Project.MSG_VERBOSE);
return;
}
try (PrintWriter w = new PrintWriter(new OutputStreamWriter(
Files.newOutputStream(manifestFile.toPath()), Manifest.JAR_ENCODING))) {
toWrite.write(w, flattenClassPaths);
if (w.checkError()) {
throw new IOException("Encountered an error writing manifest");
}
} catch (IOException e) {
throw new BuildException("Failed to write " + manifestFile,
e, getLocation());
}
}
}