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/*
* 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 com.greenpepper.ext.shaded.org.apache.tools.ant;
import java.io.BufferedReader;
import java.io.File;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Hashtable;
import java.util.Locale;
import java.util.Vector;
import com.greenpepper.ext.shaded.org.apache.tools.ant.helper.ProjectHelper2;
import com.greenpepper.ext.shaded.org.apache.tools.ant.util.LoaderUtils;
import org.xml.sax.AttributeList;
/**
* Configures a Project (complete with Targets and Tasks) based on
* a XML build file. It'll rely on a plugin to do the actual processing
* of the xml file.
*
* This class also provide static wrappers for common introspection.
*
* All helper plugins must provide backward compatibility with the
* original ant patterns, unless a different behavior is explicitly
* specified. For example, if namespace is used on the <project> tag
* the helper can expect the entire build file to be namespace-enabled.
* Namespaces or helper-specific tags can provide meta-information to
* the helper, allowing it to use new ( or different policies ).
*
* However, if no namespace is used the behavior should be exactly
* identical with the default helper.
*
*/
public class ProjectHelper {
/** The URI for ant name space */
public static final String ANT_CORE_URI = "antlib:com.greenpepper.ext.shaded.org.apache.tools.ant";
/** The URI for antlib current definitions */
public static final String ANT_CURRENT_URI = "ant:current";
/** The URI for defined types/tasks - the format is antlib: */
public static final String ANTLIB_URI = "antlib:";
/** Polymorphic attribute */
public static final String ANT_TYPE = "ant-type";
/**
* Name of JVM system property which provides the name of the
* ProjectHelper class to use.
*/
public static final String HELPER_PROPERTY =
"com.greenpepper.ext.shaded.org.apache.tools.ant.ProjectHelper";
/**
* The service identifier in jars which provide Project Helper
* implementations.
*/
public static final String SERVICE_ID =
"META-INF/services/com.greenpepper.ext.shaded.org.apache.tools.ant.ProjectHelper";
/**
* name of project helper reference that we add to a project
*/
public static final String PROJECTHELPER_REFERENCE = "ant.projectHelper";
/**
* Configures the project with the contents of the specified XML file.
*
* @param project The project to configure. Must not be null.
* @param buildFile An XML file giving the project's configuration.
* Must not be null.
*
* @exception BuildException if the configuration is invalid or cannot
* be read
*/
public static void configureProject(Project project, File buildFile)
throws BuildException {
ProjectHelper helper = ProjectHelper.getProjectHelper();
project.addReference(PROJECTHELPER_REFERENCE, helper);
helper.parse(project, buildFile);
}
/** Default constructor */
public ProjectHelper() {
}
// -------------------- Common properties --------------------
// The following properties are required by import ( and other tasks
// that read build files using ProjectHelper ).
// A project helper may process multiple files. We'll keep track
// of them - to avoid loops and to allow caching. The caching will
// probably accelerate things like .
// The key is the absolute file, the value is a processed tree.
// Since the tree is composed of UE and RC - it can be reused !
// protected Hashtable processedFiles=new Hashtable();
private Vector importStack = new Vector();
// Temporary - until we figure a better API
/** EXPERIMENTAL WILL_CHANGE
*
*/
// public Hashtable getProcessedFiles() {
// return processedFiles;
// }
/** EXPERIMENTAL WILL_CHANGE
* Import stack.
* Used to keep track of imported files. Error reporting should
* display the import path.
*
* @return the stack of import source objects.
*/
public Vector getImportStack() {
return importStack;
}
// -------------------- Parse method --------------------
/**
* Parses the project file, configuring the project as it goes.
*
* @param project The project for the resulting ProjectHelper to configure.
* Must not be null.
* @param source The source for XML configuration. A helper must support
* at least File, for backward compatibility. Helpers may
* support URL, InputStream, etc or specialized types.
*
* @since Ant1.5
* @exception BuildException if the configuration is invalid or cannot
* be read
*/
public void parse(Project project, Object source) throws BuildException {
throw new BuildException("ProjectHelper.parse() must be implemented "
+ "in a helper plugin " + this.getClass().getName());
}
/**
* Discovers a project helper instance. Uses the same patterns
* as JAXP, commons-logging, etc: a system property, a JDK1.3
* service discovery, default.
*
* @return a ProjectHelper, either a custom implementation
* if one is available and configured, or the default implementation
* otherwise.
*
* @exception BuildException if a specified helper class cannot
* be loaded/instantiated.
*/
public static ProjectHelper getProjectHelper()
throws BuildException {
// Identify the class loader we will be using. Ant may be
// in a webapp or embedded in a different app
ProjectHelper helper = null;
// First, try the system property
String helperClass = System.getProperty(HELPER_PROPERTY);
try {
if (helperClass != null) {
helper = newHelper(helperClass);
}
} catch (SecurityException e) {
System.out.println("Unable to load ProjectHelper class \""
+ helperClass + " specified in system property "
+ HELPER_PROPERTY);
}
// A JDK1.3 'service' ( like in JAXP ). That will plug a helper
// automatically if in CLASSPATH, with the right META-INF/services.
if (helper == null) {
try {
ClassLoader classLoader = LoaderUtils.getContextClassLoader();
InputStream is = null;
if (classLoader != null) {
is = classLoader.getResourceAsStream(SERVICE_ID);
}
if (is == null) {
is = ClassLoader.getSystemResourceAsStream(SERVICE_ID);
}
if (is != null) {
// This code is needed by EBCDIC and other strange systems.
// It's a fix for bugs reported in xerces
InputStreamReader isr;
try {
isr = new InputStreamReader(is, "UTF-8");
} catch (java.io.UnsupportedEncodingException e) {
isr = new InputStreamReader(is);
}
BufferedReader rd = new BufferedReader(isr);
String helperClassName = rd.readLine();
rd.close();
if (helperClassName != null
&& !"".equals(helperClassName)) {
helper = newHelper(helperClassName);
}
}
} catch (Exception ex) {
System.out.println("Unable to load ProjectHelper "
+ "from service \"" + SERVICE_ID);
}
}
if (helper != null) {
return helper;
} else {
return new ProjectHelper2();
}
}
/**
* Creates a new helper instance from the name of the class.
* It'll first try the thread class loader, then Class.forName()
* will load from the same loader that loaded this class.
*
* @param helperClass The name of the class to create an instance
* of. Must not be null.
*
* @return a new instance of the specified class.
*
* @exception BuildException if the class cannot be found or
* cannot be appropriate instantiated.
*/
private static ProjectHelper newHelper(String helperClass)
throws BuildException {
ClassLoader classLoader = LoaderUtils.getContextClassLoader();
try {
Class clazz = null;
if (classLoader != null) {
try {
clazz = classLoader.loadClass(helperClass);
} catch (ClassNotFoundException ex) {
// try next method
}
}
if (clazz == null) {
clazz = Class.forName(helperClass);
}
return ((ProjectHelper) clazz.newInstance());
} catch (Exception e) {
throw new BuildException(e);
}
}
/**
* JDK1.1 compatible access to the context class loader.
* Cut&paste from JAXP.
*
* @deprecated since 1.6.x.
* Use LoaderUtils.getContextClassLoader()
*
* @return the current context class loader, or null
* if the context class loader is unavailable.
*/
public static ClassLoader getContextClassLoader() {
if (!LoaderUtils.isContextLoaderAvailable()) {
return null;
}
return LoaderUtils.getContextClassLoader();
}
// -------------------- Static utils, used by most helpers ----------------
/**
* Configures an object using an introspection handler.
*
* @param target The target object to be configured.
* Must not be null.
* @param attrs A list of attributes to configure within the target.
* Must not be null.
* @param project The project containing the target.
* Must not be null.
*
* @deprecated since 1.6.x.
* Use IntrospectionHelper for each property.
*
* @exception BuildException if any of the attributes can't be handled by
* the target
*/
public static void configure(Object target, AttributeList attrs,
Project project) throws BuildException {
if (target instanceof TypeAdapter) {
target = ((TypeAdapter) target).getProxy();
}
IntrospectionHelper ih =
IntrospectionHelper.getHelper(project, target.getClass());
for (int i = 0; i < attrs.getLength(); i++) {
// reflect these into the target
String value = replaceProperties(project, attrs.getValue(i),
project.getProperties());
try {
ih.setAttribute(project, target,
attrs.getName(i).toLowerCase(Locale.US), value);
} catch (BuildException be) {
// id attribute must be set externally
if (!attrs.getName(i).equals("id")) {
throw be;
}
}
}
}
/**
* Adds the content of #PCDATA sections to an element.
*
* @param project The project containing the target.
* Must not be null.
* @param target The target object to be configured.
* Must not be null.
* @param buf A character array of the text within the element.
* Will not be null.
* @param start The start element in the array.
* @param count The number of characters to read from the array.
*
* @exception BuildException if the target object doesn't accept text
*/
public static void addText(Project project, Object target, char[] buf,
int start, int count) throws BuildException {
addText(project, target, new String(buf, start, count));
}
/**
* Adds the content of #PCDATA sections to an element.
*
* @param project The project containing the target.
* Must not be null.
* @param target The target object to be configured.
* Must not be null.
* @param text Text to add to the target.
* May be null, in which case this
* method call is a no-op.
*
* @exception BuildException if the target object doesn't accept text
*/
public static void addText(Project project, Object target, String text)
throws BuildException {
if (text == null) {
return;
}
if (target instanceof TypeAdapter) {
target = ((TypeAdapter) target).getProxy();
}
IntrospectionHelper.getHelper(project, target.getClass()).addText(project,
target, text);
}
/**
* Stores a configured child element within its parent object.
*
* @param project Project containing the objects.
* May be null.
* @param parent Parent object to add child to.
* Must not be null.
* @param child Child object to store in parent.
* Should not be null.
* @param tag Name of element which generated the child.
* May be null, in which case
* the child is not stored.
*/
public static void storeChild(Project project, Object parent,
Object child, String tag) {
IntrospectionHelper ih
= IntrospectionHelper.getHelper(project, parent.getClass());
ih.storeElement(project, parent, child, tag);
}
/**
* Replaces ${xxx} style constructions in the given value with
* the string value of the corresponding properties.
*
* @param project The project containing the properties to replace.
* Must not be null.
*
* @param value The string to be scanned for property references.
* May be null.
*
* @exception BuildException if the string contains an opening
* ${ without a closing
* }
* @return the original string with the properties replaced, or
* null if the original string is null.
*
* @deprecated since 1.6.x.
* Use project.replaceProperties().
* @since 1.5
*/
public static String replaceProperties(Project project, String value)
throws BuildException {
// needed since project properties are not accessible
return project.replaceProperties(value);
}
/**
* Replaces ${xxx} style constructions in the given value
* with the string value of the corresponding data types.
*
* @param project The container project. This is used solely for
* logging purposes. Must not be null.
* @param value The string to be scanned for property references.
* May be null, in which case this
* method returns immediately with no effect.
* @param keys Mapping (String to String) of property names to their
* values. Must not be null.
*
* @exception BuildException if the string contains an opening
* ${ without a closing
* }
* @return the original string with the properties replaced, or
* null if the original string is null.
* @deprecated since 1.6.x.
* Use PropertyHelper.
*/
public static String replaceProperties(Project project, String value,
Hashtable keys) throws BuildException {
PropertyHelper ph = PropertyHelper.getPropertyHelper(project);
return ph.replaceProperties(null, value, keys);
}
/**
* Parses a string containing ${xxx} style property
* references into two lists. The first list is a collection
* of text fragments, while the other is a set of string property names.
* null entries in the first list indicate a property
* reference from the second list.
*
* @param value Text to parse. Must not be null.
* @param fragments List to add text fragments to.
* Must not be null.
* @param propertyRefs List to add property names to.
* Must not be null.
*
* @deprecated since 1.6.x.
* Use PropertyHelper.
* @exception BuildException if the string contains an opening
* ${ without a closing
* }
*/
public static void parsePropertyString(String value, Vector fragments,
Vector propertyRefs)
throws BuildException {
PropertyHelper.parsePropertyStringDefault(value, fragments,
propertyRefs);
}
/**
* Map a namespaced {uri,name} to an internal string format.
* For BC purposes the names from the ant core uri will be
* mapped to "name", other names will be mapped to
* uri + ":" + name.
* @param uri The namepace URI
* @param name The localname
* @return The stringified form of the ns name
*/
public static String genComponentName(String uri, String name) {
if (uri == null || uri.equals("") || uri.equals(ANT_CORE_URI)) {
return name;
}
return uri + ":" + name;
}
/**
* extract a uri from a component name
*
* @param componentName The stringified form for {uri, name}
* @return The uri or "" if not present
*/
public static String extractUriFromComponentName(String componentName) {
if (componentName == null) {
return "";
}
int index = componentName.lastIndexOf(':');
if (index == -1) {
return "";
}
return componentName.substring(0, index);
}
/**
* extract the element name from a component name
*
* @param componentName The stringified form for {uri, name}
* @return The element name of the component
*/
public static String extractNameFromComponentName(String componentName) {
int index = componentName.lastIndexOf(':');
if (index == -1) {
return componentName;
}
return componentName.substring(index + 1);
}
/**
* Add location to build exception.
* @param ex the build exception, if the build exception
* does not include
* @param newLocation the location of the calling task (may be null)
* @return a new build exception based in the build exception with
* location set to newLocation. If the original exception
* did not have a location, just return the build exception
*/
public static BuildException addLocationToBuildException(
BuildException ex, Location newLocation) {
if (ex.getLocation() == null || ex.getMessage() == null) {
return ex;
}
String errorMessage
= "The following error occurred while executing this line:"
+ System.getProperty("line.separator")
+ ex.getLocation().toString()
+ ex.getMessage();
if (newLocation == null) {
return new BuildException(errorMessage, ex);
} else {
return new BuildException(
errorMessage, ex, newLocation);
}
}
}
