freemarker.ext.ant.FreemarkerXmlTask Maven / Gradle / Ivy
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Google App Engine compliant variation of FreeMarker.
FreeMarker is a "template engine"; a generic tool to generate text output based on templates.
/*
* 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 freemarker.ext.ant;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.StringTokenizer;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.DirectoryScanner;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.taskdefs.MatchingTask;
import org.w3c.dom.Document;
import org.xml.sax.SAXParseException;
import freemarker.ext.dom.NodeModel;
import freemarker.ext.xml.NodeListModel;
import freemarker.template.Configuration;
import freemarker.template.SimpleHash;
import freemarker.template.SimpleScalar;
import freemarker.template.Template;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateNodeModel;
import freemarker.template._TemplateAPI;
import freemarker.template.utility.ClassUtil;
import freemarker.template.utility.SecurityUtilities;
/**
* This is an Ant task for transforming
* XML documents using FreeMarker templates. It uses the adapter class
* {@link NodeListModel}. It will read a set of XML documents, and pass them to
* the template for processing, building the corresponding output files in the
* destination directory.
* It makes the following variables available to the template in the data model:
*
* - document: Deprecated! The DOM tree of the currently processed XML file wrapped
with the legacy {@link freemarker.ext.xml.NodeListModel}.
For new projects you should use the .node instead, which initially
contains the DOM Document wrapped with {@link freemarker.ext.dom.NodeModel}.
* - properties: a {@link freemarker.template.SimpleHash} containing
* properties of the project that executes the task
* - userProperties: a {@link freemarker.template.SimpleHash} containing
* user properties of the project that executes the task
* - project: the DOM tree of the XML file specified by the
* projectfile. It will not be available if you didn't specify the
* projectfile attribute.
* - further custom models can be instantiated and made available to the
* templates using the models attribute.
*
* It supports the following attributes:
*
*
* Attribute
* Description
* Required
*
*
* basedir
* location of the XML files. Defaults to the project's
* basedir.
* No
*
*
* destdir
* location to store the generated files.
* Yes
*
*
* includes
* comma-separated list of patterns of files that must be
* included; all files are included when omitted.
* No
*
*
* includesfile
* the name of a file that contains
* include patterns.
* No
*
*
* excludes
* comma-separated list of patterns of files that must be
* excluded; no files (except default excludes) are excluded when omitted.
* No
*
*
* excludesfile
* the name of a file that contains
* exclude patterns.
* No
*
*
* defaultexcludes
* indicates whether default excludes should be used
* (yes | no); default excludes are used when omitted.
* No
*
*
* extension
* extension of generated files. Defaults to .html.
* No
*
*
* template
* name of the FreeMarker template file that will be
* applied by default to XML files
* No
*
*
* templateDir
* location of the FreeMarker template(s) to be used, defaults
* to the project's baseDir
* No
*
*
* projectfile
* path to the project file. The poject file must be an XML file.
* If omitted, it will not be available to templates
* No
*
*
* incremental
* indicates whether all files should be regenerated (no), or
* only those that are older than the XML file, the template file, or the
* project file (yes). Defaults to yes.
* No
*
*
* encoding
* The encoding of the output files. Defaults to platform
* default encoding.
* No
*
*
* templateEncoding
* The encoding of the template files. Defaults to platform
* default encoding.
* No
*
*
* validation
* Whether to validate the XML input. Defaults to off.
* No
*
*
* models
* A list of [name=]className pairs separated by spaces,
* commas, or semicolons that specifies further models that should be
* available to templates. If name is omitted, the unqualified class name
* is used as the name. Every class that is specified must implement the
* TemplateModel interface and have a no-args constructor.
* No
*
*
*
* It supports the following nesed elements:
*
*
*
* Element
* Description
* Required
*
*
* prepareModel
*
* This element executes Jython script before the processing of each XML
* files, that you can use to modify the data model.
* You either enter the Jython script directly nested into this
* element, or specify a Jython script file with the file
* attribute.
* The following variables are added to the Jython runtime's local
* namespace before the script is invoked:
*
* - model: The data model as
java.util.HashMap.
* You can read and modify the data model with this variable.
* - doc: The XML document as
org.w3c.dom.Document.
* - project: The project document (if used) as
*
org.w3c.dom.Document.
*
* If this element is used, Jython classes (tried with Jython 2.1)
* must be available.
*
* No
*
*
* prepareEnvironment
* This element executes Jython script before the processing
* of each XML files, that you can use to modify the freemarker environment
* ({@link freemarker.core.Environment}). The script is executed after the
* prepareModel element. The accessible Jython variables are the
* same as with the prepareModel element, except that there is no
* model variable, but there is env variable, which is
* the FreeMarker environment ({@link freemarker.core.Environment}).
* If this element is used, Jython classes (tried with Jython 2.1)
* must be available.
*
* No
*
*
* @deprecated FMPP is a more complete solution.
*/
@Deprecated
public class FreemarkerXmlTask
extends
MatchingTask {
private JythonAntTask prepareModel;
private JythonAntTask prepareEnvironment;
private final DocumentBuilderFactory builderFactory;
private DocumentBuilder builder;
/** the {@link Configuration} used by this task. */
private Configuration cfg = new Configuration();
/** the destination directory */
private File destDir;
/** the base directory */
private File baseDir;
//Where the templates live
private File templateDir;
/** the template= attribute */
private String templateName;
/** The template in its parsed form */
private Template parsedTemplate;
/** last modified of the template sheet */
private long templateFileLastModified = 0;
/** the projectFile= attribute */
private String projectAttribute = null;
private File projectFile = null;
/** The DOM tree of the project wrapped into FreeMarker TemplateModel */
private TemplateModel projectTemplate;
// The DOM tree wrapped using the freemarker.ext.dom wrapping.
private TemplateNodeModel projectNode;
private TemplateModel propertiesTemplate;
private TemplateModel userPropertiesTemplate;
/** last modified of the project file if it exists */
private long projectFileLastModified = 0;
/** check the last modified date on files. defaults to true */
private boolean incremental = true;
/** the default output extension is .html */
private String extension = ".html";
private String encoding = SecurityUtilities.getSystemProperty("file.encoding", "utf-8");
private String templateEncoding = encoding;
private boolean validation = false;
private String models = "";
private final Map modelsMap = new HashMap();
/**
* Constructor creates the SAXBuilder.
*/
public FreemarkerXmlTask() {
builderFactory = DocumentBuilderFactory.newInstance();
builderFactory.setNamespaceAware(true);
}
/**
* Set the base directory. Defaults to .
*/
public void setBasedir(File dir) {
baseDir = dir;
}
/**
* Set the destination directory into which the generated
* files should be copied to
* @param dir the name of the destination directory
*/
public void setDestdir(File dir) {
destDir = dir;
}
/**
* Set the output file extension. .html by default.
*/
public void setExtension(String extension) {
this.extension = extension;
}
public void setTemplate(String templateName) {
this.templateName = templateName;
}
public void setTemplateDir(File templateDir) throws BuildException {
this.templateDir = templateDir;
try {
cfg.setDirectoryForTemplateLoading(templateDir);
} catch (Exception e) {
throw new BuildException(e);
}
}
/**
* Set the path to the project XML file
*/
public void setProjectfile(String projectAttribute) {
this.projectAttribute = projectAttribute;
}
/**
* Turn on/off incremental processing. On by default
*/
public void setIncremental(String incremental) {
this.incremental = !(incremental.equalsIgnoreCase("false") || incremental.equalsIgnoreCase("no") || incremental.equalsIgnoreCase("off"));
}
/**
* Set encoding for generated files. Defaults to platform default encoding.
*/
public void setEncoding(String encoding) {
this.encoding = encoding;
}
public void setTemplateEncoding(String inputEncoding) {
this.templateEncoding = inputEncoding;
}
/**
* Sets whether to validate the XML input.
*/
public void setValidation(boolean validation) {
this.validation = validation;
}
public void setModels(String models) {
this.models = models;
}
@Override
public void execute() throws BuildException {
DirectoryScanner scanner;
String[] list;
if (baseDir == null) {
baseDir = getProject().getBaseDir();
}
if (destDir == null ) {
String msg = "destdir attribute must be set!";
throw new BuildException(msg, getLocation());
}
File templateFile = null;
if (templateDir == null) {
if (templateName != null) {
templateFile = new File(templateName);
if (!templateFile.isAbsolute()) {
templateFile = new File(getProject().getBaseDir(), templateName);
}
templateDir = templateFile.getParentFile();
templateName = templateFile.getName();
} else {
templateDir = baseDir;
}
setTemplateDir(templateDir);
} else if (templateName != null) {
if (new File(templateName).isAbsolute()) {
throw new BuildException("Do not specify an absolute location for the template as well as a templateDir");
}
templateFile = new File(templateDir, templateName);
}
if (templateFile != null) {
templateFileLastModified = templateFile.lastModified();
}
try {
if (templateName != null) {
parsedTemplate = cfg.getTemplate(templateName, templateEncoding);
}
} catch (IOException ioe) {
throw new BuildException(ioe.toString());
}
// get the last modification of the template
log("Transforming into: " + destDir.getAbsolutePath(), Project.MSG_INFO);
// projectFile relative to baseDir
if (projectAttribute != null && projectAttribute.length() > 0) {
projectFile = new File(baseDir, projectAttribute);
if (projectFile.isFile())
projectFileLastModified = projectFile.lastModified();
else {
log ("Project file is defined, but could not be located: " +
projectFile.getAbsolutePath(), Project.MSG_INFO );
projectFile = null;
}
}
generateModels();
// find the files/directories
scanner = getDirectoryScanner(baseDir);
propertiesTemplate = wrapMap(project.getProperties());
userPropertiesTemplate = wrapMap(project.getUserProperties());
builderFactory.setValidating(validation);
try {
builder = builderFactory.newDocumentBuilder();
} catch (ParserConfigurationException e) {
throw new BuildException("Could not create document builder", e, getLocation());
}
// get a list of files to work on
list = scanner.getIncludedFiles();
for (int i = 0; i < list.length; ++i) {
process(baseDir, list[i], destDir);
}
}
public void addConfiguredJython(JythonAntTask jythonAntTask) {
this.prepareEnvironment = jythonAntTask;
}
public void addConfiguredPrepareModel(JythonAntTask prepareModel) {
this.prepareModel = prepareModel;
}
public void addConfiguredPrepareEnvironment(JythonAntTask prepareEnvironment) {
this.prepareEnvironment = prepareEnvironment;
}
/**
* Process an XML file using FreeMarker
*/
private void process(File baseDir, String xmlFile, File destDir)
throws BuildException {
File outFile = null;
File inFile = null;
try {
// the current input file relative to the baseDir
inFile = new File(baseDir,xmlFile);
// the output file relative to basedir
outFile = new File(destDir,
xmlFile.substring(0,
xmlFile.lastIndexOf('.')) + extension);
// only process files that have changed
if (!incremental ||
(inFile.lastModified() > outFile.lastModified() ||
templateFileLastModified > outFile.lastModified() ||
projectFileLastModified > outFile.lastModified())) {
ensureDirectoryFor(outFile);
//-- command line status
log("Input: " + xmlFile, Project.MSG_INFO );
if (projectTemplate == null && projectFile != null) {
Document doc = builder.parse(projectFile);
projectTemplate = new NodeListModel(builder.parse(projectFile));
projectNode = NodeModel.wrap(doc);
}
// Build the file DOM
Document docNode = builder.parse(inFile);
TemplateModel document = new NodeListModel(docNode);
TemplateNodeModel docNodeModel = NodeModel.wrap(docNode);
HashMap root = new HashMap();
root.put("document", document);
insertDefaults(root);
// Process the template and write out
// the result as the outFile.
try (Writer writer = new BufferedWriter(
new OutputStreamWriter(new FileOutputStream(outFile), encoding))) {
if (parsedTemplate == null) {
throw new BuildException("No template file specified in build script or in XML file");
}
if (prepareModel != null) {
Map vars = new HashMap();
vars.put("model", root);
vars.put("doc", docNode);
if (projectNode != null) {
vars.put("project", ((NodeModel) projectNode).getNode());
}
prepareModel.execute(vars);
}
freemarker.core.Environment env = parsedTemplate.createProcessingEnvironment(root, writer);
env.setCurrentVisitorNode(docNodeModel);
if (prepareEnvironment != null) {
Map vars = new HashMap();
vars.put("env", env);
vars.put("doc", docNode);
if (projectNode != null) {
vars.put("project", ((NodeModel) projectNode).getNode());
}
prepareEnvironment.execute(vars);
}
env.process();
writer.flush();
}
log("Output: " + outFile, Project.MSG_INFO );
}
} catch (SAXParseException spe) {
Throwable rootCause = spe;
if (spe.getException() != null)
rootCause = spe.getException();
log("XML parsing error in " + inFile.getAbsolutePath(), Project.MSG_ERR);
log("Line number " + spe.getLineNumber());
log("Column number " + spe.getColumnNumber());
throw new BuildException(rootCause, getLocation());
} catch (Throwable e) {
if (outFile != null ) {
if (!outFile.delete() && outFile.exists()) {
log("Failed to delete " + outFile, Project.MSG_WARN);
}
}
e.printStackTrace();
throw new BuildException(e, getLocation());
}
}
private void generateModels() {
StringTokenizer modelTokenizer = new StringTokenizer(models, ",; ");
while (modelTokenizer.hasMoreTokens()) {
String modelSpec = modelTokenizer.nextToken();
String name = null;
String clazz = null;
int sep = modelSpec.indexOf('=');
if (sep == -1) {
// No explicit name - use unqualified class name
clazz = modelSpec;
int dot = clazz.lastIndexOf('.');
if (dot == -1) {
// clazz in the default package
name = clazz;
} else {
name = clazz.substring(dot + 1);
}
} else {
name = modelSpec.substring(0, sep);
clazz = modelSpec.substring(sep + 1);
}
try {
modelsMap.put(name, ClassUtil.forName(clazz).newInstance());
} catch (Exception e) {
throw new BuildException(e);
}
}
}
/**
* create directories as needed
*/
private void ensureDirectoryFor( File targetFile ) throws BuildException {
File directory = new File( targetFile.getParent() );
if (!directory.exists()) {
if (!directory.mkdirs()) {
throw new BuildException("Unable to create directory: "
+ directory.getAbsolutePath(), getLocation());
}
}
}
private static TemplateModel wrapMap(Map table) {
SimpleHash model = new SimpleHash(_TemplateAPI.SAFE_OBJECT_WRAPPER);
for (Iterator it = table.entrySet().iterator(); it.hasNext(); ) {
Map.Entry entry = (Map.Entry) it.next();
model.put(String.valueOf(entry.getKey()), new SimpleScalar(String.valueOf(entry.getValue())));
}
return model;
}
protected void insertDefaults(Map root) {
root.put("properties", propertiesTemplate);
root.put("userProperties", userPropertiesTemplate);
if (projectTemplate != null) {
root.put("project", projectTemplate);
root.put("project_node", projectNode);
}
if (modelsMap.size() > 0) {
for (Iterator it = modelsMap.entrySet().iterator(); it.hasNext(); ) {
Map.Entry entry = (Map.Entry) it.next();
root.put(entry.getKey(), entry.getValue());
}
}
}
}