org.apache.tools.ant.taskdefs.AntStructure Maven / Gradle / Ivy
/*
* 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
*
* https://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.OutputStreamWriter;
import java.io.PrintWriter;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Hashtable;
import java.util.List;
import java.util.Set;
import java.util.stream.Collector;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.IntrospectionHelper;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.TaskContainer;
import org.apache.tools.ant.types.EnumeratedAttribute;
import org.apache.tools.ant.types.Reference;
/**
* Creates a partial DTD for Ant from the currently known tasks.
*
*
* @since Ant 1.1
*
* @ant.task category="xml"
*/
public class AntStructure extends Task {
private File output;
private StructurePrinter printer = new DTDPrinter();
/**
* The output file.
* @param output the output file
*/
public void setOutput(final File output) {
this.output = output;
}
/**
* The StructurePrinter to use.
* @param p the printer to use.
* @since Ant 1.7
*/
public void add(final StructurePrinter p) {
printer = p;
}
/**
* Build the antstructure DTD.
*
* @exception BuildException if the DTD cannot be written.
*/
@Override
public void execute() throws BuildException {
if (output == null) {
throw new BuildException("output attribute is required", getLocation());
}
try (PrintWriter out = new PrintWriter(new OutputStreamWriter(
Files.newOutputStream(output.toPath()), StandardCharsets.UTF_8))) {
printer.printHead(out, getProject(),
new Hashtable<>(getProject().getTaskDefinitions()),
new Hashtable<>(getProject().getDataTypeDefinitions()));
printer.printTargetDecl(out);
for (final String typeName : getProject().getCopyOfDataTypeDefinitions().keySet()) {
printer.printElementDecl(out, getProject(), typeName,
getProject().getDataTypeDefinitions().get(typeName));
}
for (final String tName : getProject().getCopyOfTaskDefinitions().keySet()) {
printer.printElementDecl(out, getProject(), tName,
getProject().getTaskDefinitions().get(tName));
}
printer.printTail(out);
if (out.checkError()) {
throw new IOException("Encountered an error writing Ant structure");
}
} catch (final IOException ioe) {
throw new BuildException("Error writing "
+ output.getAbsolutePath(), ioe, getLocation());
}
}
/**
* Writes the actual structure information.
*
* {@link #printHead}, {@link #printTargetDecl} and {@link #printTail}
* are called exactly once, {@link #printElementDecl} once for
* each declared task and type.
*/
public interface StructurePrinter {
/**
* Prints the header of the generated output.
*
* @param out PrintWriter to write to.
* @param p Project instance for the current task
* @param tasks map (name to implementing class)
* @param types map (name to implementing class)
* data types.
*/
void printHead(PrintWriter out, Project p, Hashtable> tasks,
Hashtable> types);
/**
* Prints the definition for the target element.
* @param out PrintWriter to write to.
*/
void printTargetDecl(PrintWriter out);
/**
* Print the definition for a given element.
*
* @param out PrintWriter to write to.
* @param p Project instance for the current task
* @param name element name.
* @param element class of the defined element.
*/
void printElementDecl(PrintWriter out, Project p, String name,
Class element);
/**
* Prints the trailer.
* @param out PrintWriter to write to.
*/
void printTail(PrintWriter out);
}
private static class DTDPrinter implements StructurePrinter {
private static final String BOOLEAN = "%boolean;";
private static final String TASKS = "%tasks;";
private static final String TYPES = "%types;";
private final Hashtable visited = new Hashtable<>();
@Override
public void printTail(final PrintWriter out) {
visited.clear();
}
@Override
public void printHead(final PrintWriter out, final Project p, final Hashtable> tasks,
final Hashtable> types) {
printHead(out, tasks.keySet(), types.keySet());
}
/**
* Prints the header of the generated output.
*
* Basically this prints the XML declaration, defines some
* entities and the project element.
*/
private void printHead(final PrintWriter out, final Set tasks,
final Set types) {
out.println("");
out.println("");
out.println(tasks.stream().collect(
Collectors.joining(" | ", "")));
out.println(types.stream().collect(
Collectors.joining(" | ", "")));
out.println();
out.print("");
out.println("");
out.println("");
}
/**
* Prints the definition for the target element.
*/
@Override
public void printTargetDecl(final PrintWriter out) {
out.print("");
out.println("");
printTargetAttrs(out, "target");
out.println("");
out.println("");
printTargetAttrs(out, "extension-point");
}
/**
* Prints the definition for the target element.
*/
private void printTargetAttrs(final PrintWriter out, final String tag) {
out.print("");
out.println("");
}
/**
* Print the definition for a given element.
*/
@Override
public void printElementDecl(final PrintWriter out, final Project p,
final String name, final Class element) {
if (visited.containsKey(name)) {
return;
}
visited.put(name, "");
IntrospectionHelper ih;
try {
ih = IntrospectionHelper.getHelper(p, element);
} catch (final Throwable t) {
/*
* TODO - failed to load the class properly.
*
* should we print a warning here?
*/
return;
}
StringBuilder sb = new StringBuilder("%n%n",
name));
out.println(sb);
return;
}
final List v = new ArrayList<>();
if (ih.supportsCharacters()) {
v.add("#PCDATA");
}
if (TaskContainer.class.isAssignableFrom(element)) {
v.add(TASKS);
}
v.addAll(Collections.list(ih.getNestedElements()));
final Collector joinAlts =
Collectors.joining(" | ", "(", ")");
if (v.isEmpty()) {
sb.append("EMPTY");
} else {
sb.append(v.stream().collect(joinAlts));
if (v.size() > 1 || !"#PCDATA".equals(v.get(0))) {
sb.append("*");
}
}
sb.append(">");
out.println(sb);
sb = new StringBuilder();
sb.append(String.format(" type = ih.getAttributeType(attrName);
if (type.equals(Boolean.class) || type.equals(Boolean.TYPE)) {
sb.append(BOOLEAN).append(" ");
} else if (Reference.class.isAssignableFrom(type)) {
sb.append("IDREF ");
} else if (EnumeratedAttribute.class.isAssignableFrom(type)) {
try {
final EnumeratedAttribute ea =
type.asSubclass(EnumeratedAttribute.class).newInstance();
final String[] values = ea.getValues();
if (values == null || values.length == 0
|| !areNmtokens(values)) {
sb.append("CDATA ");
} else {
sb.append(Stream.of(values).collect(joinAlts)).append(" ");
}
} catch (final InstantiationException | IllegalAccessException ie) {
sb.append("CDATA ");
}
} else if (Enum.class.isAssignableFrom(type)) {
try {
final Enum[] values =
(Enum[]) type.getMethod("values").invoke(null);
if (values.length == 0) {
sb.append("CDATA ");
} else {
sb.append(Stream.of(values).map(Enum::name)
.collect(joinAlts)).append(" ");
}
} catch (final Exception x) {
sb.append("CDATA ");
}
} else {
sb.append("CDATA ");
}
sb.append("#IMPLIED");
}
sb.append(String.format(">%n"));
out.println(sb);
for (String nestedName : v) {
if (!"#PCDATA".equals(nestedName)
&& !TASKS.equals(nestedName)
&& !TYPES.equals(nestedName)) {
printElementDecl(out, p, nestedName, ih.getElementType(nestedName));
}
}
}
/**
* Does this String match the XML-NMTOKEN production?
* @param s the string to test
* @return true if the string matches the XML-NMTOKEN
*/
public static final boolean isNmtoken(final String s) {
final int length = s.length();
for (int i = 0; i < length; i++) {
final char c = s.charAt(i);
// TODO - we are committing CombiningChar and Extender here
if (!Character.isLetterOrDigit(c)
&& c != '.' && c != '-' && c != '_' && c != ':') {
return false;
}
}
return true;
}
/**
* Do the Strings all match the XML-NMTOKEN production?
*
* Otherwise they are not suitable as an enumerated attribute,
* for example.
* @param s the array of string to test
* @return true if all the strings in the array math XML-NMTOKEN
*/
public static final boolean areNmtokens(final String[] s) {
for (String value : s) {
if (!isNmtoken(value)) {
return false;
}
}
return true;
}
}
/**
* Does this String match the XML-NMTOKEN production?
* @param s the string to test
* @return true if the string matches the XML-NMTOKEN
*/
protected boolean isNmtoken(final String s) {
return DTDPrinter.isNmtoken(s);
}
/**
* Do the Strings all match the XML-NMTOKEN production?
*
* Otherwise they are not suitable as an enumerated attribute,
* for example.
* @param s the array of string to test
* @return true if all the strings in the array math XML-NMTOKEN
*/
protected boolean areNmtokens(final String[] s) {
return DTDPrinter.areNmtokens(s);
}
}
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