org.crsh.command.BaseShellCommand Maven / Gradle / Ivy
/*
* Copyright (C) 2012 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.crsh.command;
import org.crsh.cli.descriptor.CommandDescriptor;
import org.crsh.cli.impl.Delimiter;
import org.crsh.cli.impl.completion.CompletionException;
import org.crsh.cli.impl.completion.CompletionMatch;
import org.crsh.cli.impl.completion.CompletionMatcher;
import org.crsh.cli.impl.descriptor.CommandDescriptorImpl;
import org.crsh.cli.impl.descriptor.HelpDescriptor;
import org.crsh.cli.impl.invocation.InvocationException;
import org.crsh.cli.impl.invocation.InvocationMatch;
import org.crsh.cli.impl.invocation.InvocationMatcher;
import org.crsh.cli.impl.invocation.Resolver;
import org.crsh.cli.impl.lang.CommandFactory;
import org.crsh.cli.spi.Completer;
import org.crsh.cli.spi.Completion;
import org.crsh.shell.ErrorType;
import org.crsh.util.TypeResolver;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.lang.reflect.Type;
import java.lang.reflect.UndeclaredThrowableException;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
/** @author Julien Viet */
public class BaseShellCommand implements ShellCommand {
/** . */
private final Class clazz;
/** . */
private final CommandDescriptorImpl descriptor;
public BaseShellCommand(Class clazz) {
//
CommandFactory factory = new CommandFactory(getClass().getClassLoader());
//
this.clazz = clazz;
this.descriptor = HelpDescriptor.create(factory.create(clazz));
}
public CommandDescriptor getDescriptor() {
return descriptor;
}
public final CompletionMatch complete(RuntimeContext context, String line) throws CommandCreationException {
// WTF
CompletionMatcher analyzer = descriptor.completer("main");
//
CC command = createCommand();
//
Completer completer = command instanceof Completer ? (Completer)command : null;
//
command.context = context;
try {
return analyzer.match(completer, line);
}
catch (CompletionException e) {
command.log.log(Level.SEVERE, "Error during completion of line " + line, e);
return new CompletionMatch(Delimiter.EMPTY, Completion.create());
}
finally {
command.context = null;
}
}
public final String describe(String line, DescriptionFormat mode) {
// WTF
InvocationMatcher analyzer = descriptor.invoker("main");
//
InvocationMatch match;
try {
match = analyzer.match(line);
}
catch (org.crsh.cli.SyntaxException e) {
throw new SyntaxException(e.getMessage());
}
//
try {
switch (mode) {
case DESCRIBE:
return match.getDescriptor().getUsage();
case MAN:
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
match.getDescriptor().printMan(pw);
return sw.toString();
case USAGE:
StringWriter sw2 = new StringWriter();
PrintWriter pw2 = new PrintWriter(sw2);
match.getDescriptor().printUsage(pw2);
return sw2.toString();
}
}
catch (IOException e) {
throw new AssertionError(e);
}
//
return null;
}
public CommandInvoker resolveInvoker(String name, Map options, List args) throws CommandCreationException {
InvocationMatcher matcher = descriptor.invoker("main");
InvocationMatch match;
try {
match = matcher.match(name, options, args);
}
catch (org.crsh.cli.SyntaxException e) {
throw new SyntaxException(e.getMessage());
}
return resolveInvoker(match);
}
public CommandInvoker resolveInvoker(String line) throws CommandCreationException {
InvocationMatcher analyzer = descriptor.invoker("main");
InvocationMatch match;
try {
match = analyzer.match(line);
}
catch (org.crsh.cli.SyntaxException e) {
throw new SyntaxException(e.getMessage());
}
return resolveInvoker(match);
}
public final CommandInvoker resolveInvoker(final InvocationMatch match) throws CommandCreationException {
return resolveInvoker2(match);
}
private CommandInvoker resolveInvoker2(final InvocationMatch match) throws CommandCreationException {
// Invoker
org.crsh.cli.impl.invocation.CommandInvoker invoker = match.getInvoker();
// Necessary...
final CC command = createCommand();
/** The resolver. */
Resolver resolver = new Resolver() {
public T resolve(Class type) {
if (type.equals(InvocationContext.class)) {
return type.cast(command.peekContext());
} else {
return null;
}
}
};
// Do we have a pipe command or not ?
if (PipeCommand.class.isAssignableFrom(invoker.getReturnType())) {
org.crsh.cli.impl.invocation.CommandInvoker invoker2 = invoker;
return getPipeCommandInvoker(invoker2, command, resolver);
} else {
// A priori it could be any class
Class producedType = Object.class;
// Override produced type from InvocationContext if any
Class[] parameterTypes = invoker.getParameterTypes();
for (int i = 0;i < parameterTypes.length;i++) {
Class parameterType = parameterTypes[i];
if (InvocationContext.class.isAssignableFrom(parameterType)) {
Type contextGenericParameterType = invoker.getGenericParameterTypes()[i];
producedType = TypeResolver.resolveToClass(contextGenericParameterType, InvocationContext.class, 0);
break;
}
}
//
return getInvoker(invoker, command, producedType, resolver);
}
}
private CC createCommand() throws CommandCreationException {
CC command;
try {
command = clazz.newInstance();
}
catch (Exception e) {
String name = clazz.getSimpleName();
throw new CommandCreationException(name, ErrorType.INTERNAL, "Could not create command " + name + " instance", e);
}
return command;
}
private > CommandInvoker getPipeCommandInvoker(
final org.crsh.cli.impl.invocation.CommandInvoker invoker,
final CC instance,
final Resolver resolver) {
return new CommandInvoker() {
/** . */
final Type ret = invoker.getGenericReturnType();
/** . */
final Class consumedType = (Class)TypeResolver.resolveToClass(ret, PipeCommand.class, 0);
/** . */
final Class producedType = (Class
)TypeResolver.resolveToClass(ret, PipeCommand.class, 1);
PipeCommand real;
public Class getProducedType() {
return producedType;
}
public Class getConsumedType() {
return consumedType;
}
public void open(CommandContext consumer) {
// Java is fine with that but not intellij....
CommandContext consumer2 = (CommandContext
)consumer;
open2(consumer2);
}
public void open2(final CommandContext
consumer) {
//
final InvocationContextImpl
invocationContext = new InvocationContextImpl
(consumer);
// Push context
instance.pushContext(invocationContext);
// Set the unmatched part
instance.unmatched = invoker.getMatch().getRest();
//
PC ret;
try {
ret = invoker.invoke(resolver, instance);
}
catch (org.crsh.cli.SyntaxException e) {
throw new SyntaxException(e.getMessage());
} catch (InvocationException e) {
throw instance.toScript(e.getCause());
}
// It's a pipe command
if (ret != null) {
real = ret;
real.open(invocationContext);
}
}
public void provide(C element) throws IOException {
if (real != null) {
real.provide(element);
}
}
public void flush() throws IOException {
if (real != null) {
real.flush();
} else {
instance.peekContext().flush();
}
}
public void close() throws IOException {
if (real != null) {
try {
real.close();
}
finally {
instance.popContext();
}
} else {
InvocationContext context = instance.popContext();
context.close();
}
instance.unmatched = null;
}
};
}
private
CommandInvoker getInvoker(
final org.crsh.cli.impl.invocation.CommandInvoker invoker,
final CC instance,
final Class _producedType,
final Resolver resolver) {
return new CommandInvoker() {
public Class getProducedType() {
return _producedType;
}
public Class getConsumedType() {
return Void.class;
}
public void open(CommandContext consumer) {
// Java is fine with that but not intellij....
CommandContext consumer2 = (CommandContext
)consumer;
open2(consumer2);
}
public void open2(final CommandContext
consumer) {
//
final InvocationContextImpl
invocationContext = new InvocationContextImpl
(consumer);
// Push context
instance.pushContext(invocationContext);
// Set the unmatched part
instance.unmatched = invoker.getMatch().getRest();
}
public void provide(Void element) throws IOException {
// Drop everything
}
public void flush() throws IOException {
// peekContext().flush();
}
public void close() throws IOException, UndeclaredThrowableException {
//
Object ret;
try {
ret = invoker.invoke(resolver, instance);
}
catch (org.crsh.cli.SyntaxException e) {
throw new SyntaxException(e.getMessage());
} catch (InvocationException e) {
throw instance.toScript(e.getCause());
}
//
if (ret != null) {
instance.peekContext().getWriter().print(ret);
}
//
InvocationContext context = instance.popContext();
context.flush();
context.close();
instance.unmatched = null;
}
};
}
}