org.unix4j.unix.cd.CdCommand Maven / Gradle / Ivy
package org.unix4j.unix.cd;
import org.unix4j.command.AbstractCommand;
import org.unix4j.command.Command;
import org.unix4j.command.JoinedCommand;
import org.unix4j.context.DerivedExecutionContext;
import org.unix4j.context.ExecutionContext;
import org.unix4j.processor.LineProcessor;
import org.unix4j.unix.Cd;
import org.unix4j.util.FileUtil;
import java.io.File;
import java.util.List;
/**
* Implementation of the {@link Cd cd} command.
*/
class CdCommand extends AbstractCommand {
public CdCommand(CdArguments arguments) {
super(Cd.NAME, arguments);
}
@Override
public Command join(Command next) {
return join(this, next);
}
private static Command join(Command first, Command second) {
return new JoinedCommand(first, second) {
@Override
public LineProcessor execute(ExecutionContext context, LineProcessor output) {
final CdArguments args = getArguments(context);
final File file;
if (args.isPathSet()) {
final String path = args.getPath(context);
final List files = FileUtil.expandFiles(context.getCurrentDirectory(), path);
if (files.isEmpty()) {
throw new IllegalArgumentException("no file found for path argument: " + path);
}
file = files.get(0);
} else if (args.isFileSet()) {
file = args.getFile();
} else {
file = context.getUserHome();
}
if (!file.isDirectory()) {
throw new IllegalArgumentException("not a valid directory: " + file.getAbsolutePath());
}
final DerivedExecutionContext currentDirContext = new DerivedExecutionContext(context);
currentDirContext.setCurrentDirectory(file);
return super.execute(currentDirContext, output);
}
@Override
public Command join(Command next) {
return CdCommand.join(getFirst(), getSecond().join(next));
}
};
}
@Override
public LineProcessor execute(ExecutionContext context, final LineProcessor output) {
return output;// pipe through, we don't do anything with the input or
// output
}
}