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org.unix4j.unix.cat.CatArguments Maven / Gradle / Ivy
package org.unix4j.unix.cat;
import java.util.List;
import java.util.Map;
import java.util.Arrays;
import org.unix4j.command.Arguments;
import org.unix4j.context.ExecutionContext;
import org.unix4j.convert.ValueConverter;
import org.unix4j.option.DefaultOptionSet;
import org.unix4j.util.ArgsUtil;
import org.unix4j.util.ArrayUtil;
import org.unix4j.variable.Arg;
import org.unix4j.variable.VariableContext;
import org.unix4j.unix.Cat;
/**
* Arguments and options for the {@link Cat cat} command.
*/
public final class CatArguments implements Arguments {
private final CatOptions options;
// operand:
private java.io.File[] files;
private boolean filesIsSet = false;
// operand:
private String[] paths;
private boolean pathsIsSet = false;
// operand:
private String[] args;
private boolean argsIsSet = false;
/**
* Constructor to use if no options are specified.
*/
public CatArguments() {
this.options = CatOptions.EMPTY;
}
/**
* Constructor with option set containing the selected command options.
*
* @param options the selected options
* @throws NullPointerException if the argument is null
*/
public CatArguments(CatOptions options) {
if (options == null) {
throw new NullPointerException("options argument cannot be null");
}
this.options = options;
}
/**
* Returns the options set containing the selected command options. Returns
* an empty options set if no option has been selected.
*
* @return set with the selected options
*/
public CatOptions getOptions() {
return options;
}
/**
* Constructor string arguments encoding options and arguments, possibly
* also containing variable expressions.
*
* @param args string arguments for the command
* @throws NullPointerException if args is null
*/
public CatArguments(String... args) {
this();
this.args = args;
this.argsIsSet = true;
}
private Object[] resolveVariables(VariableContext context, String... unresolved) {
final Object[] resolved = new Object[unresolved.length];
for (int i = 0; i < resolved.length; i++) {
final String expression = unresolved[i];
if (Arg.isVariable(expression)) {
resolved[i] = resolveVariable(context, expression);
} else {
resolved[i] = expression;
}
}
return resolved;
}
private V convertList(ExecutionContext context, String operandName, Class operandType, List values) {
if (values.size() == 1) {
final Object value = values.get(0);
return convert(context, operandName, operandType, value);
}
return convert(context, operandName, operandType, values);
}
private Object resolveVariable(VariableContext context, String variable) {
final Object value = context.getValue(variable);
if (value != null) {
return value;
}
throw new IllegalArgumentException("cannot resolve variable " + variable +
" in command: cat " + this);
}
private V convert(ExecutionContext context, String operandName, Class operandType, Object value) {
final ValueConverter converter = context.getValueConverterFor(operandType);
final V convertedValue;
if (converter != null) {
convertedValue = converter.convert(value);
} else {
if (CatOptions.class.equals(operandType)) {
convertedValue = operandType.cast(CatOptions.CONVERTER.convert(value));
} else {
convertedValue = null;
}
}
if (convertedValue != null) {
return convertedValue;
}
throw new IllegalArgumentException("cannot convert --" + operandName +
" value '" + value + "' into the type " + operandType.getName() +
" for cat command");
}
@Override
public CatArguments getForContext(ExecutionContext context) {
if (context == null) {
throw new NullPointerException("context cannot be null");
}
if (!argsIsSet || args.length == 0) {
//nothing to resolve
return this;
}
//check if there is at least one variable
boolean hasVariable = false;
for (final String arg : args) {
if (arg != null && arg.startsWith("$")) {
hasVariable = true;
break;
}
}
//resolve variables
final Object[] resolvedArgs = hasVariable ? resolveVariables(context.getVariableContext(), this.args) : this.args;
//convert now
final List defaultOperands = Arrays.asList("paths");
final Map> map = ArgsUtil.parseArgs("options", defaultOperands, resolvedArgs);
final CatOptions.Default options = new CatOptions.Default();
final CatArguments argsForContext = new CatArguments(options);
for (final Map.Entry> e : map.entrySet()) {
if ("files".equals(e.getKey())) {
final java.io.File[] value = convertList(context, "files", java.io.File[].class, e.getValue());
argsForContext.setFiles(value);
} else if ("paths".equals(e.getKey())) {
final String[] value = convertList(context, "paths", String[].class, e.getValue());
argsForContext.setPaths(value);
} else if ("args".equals(e.getKey())) {
throw new IllegalStateException("invalid operand '" + e.getKey() + "' in cat command args: " + Arrays.toString(args));
} else if ("options".equals(e.getKey())) {
final CatOptions value = convertList(context, "options", CatOptions.class, e.getValue());
options.setAll(value);
} else {
throw new IllegalStateException("invalid operand '" + e.getKey() + "' in cat command args: " + Arrays.toString(args));
}
}
return argsForContext;
}
/**
* Returns the {@code } operand value: The input files to be printed; relative paths are not resolved (use
the string path argument to enable relative path resolving based on
the current working directory).
*
* @return the {@code } operand value (variables are not resolved)
* @throws IllegalStateException if this operand has never been set
*
*/
public java.io.File[] getFiles() {
if (filesIsSet) {
return files;
}
throw new IllegalStateException("operand has not been set: " + files);
}
/**
* Returns true if the {@code } operand has been set.
*
* Note that this method returns true even if {@code null} was passed to the
* {@link #setFiles(java.io.File[])} method.
*
* @return true if the setter for the {@code } operand has
* been called at least once
*/
public boolean isFilesSet() {
return filesIsSet;
}
/**
* Sets {@code }: The input files to be printed; relative paths are not resolved (use
the string path argument to enable relative path resolving based on
the current working directory).
*
* @param files the value for the {@code } operand
*/
public void setFiles(java.io.File... files) {
this.files = files;
this.filesIsSet = true;
}
/**
* Returns the {@code } operand value: Pathnames of the input files to be printed; wildcards * and ? are
supported; relative paths are resolved on the basis of the current
working directory.
*
* @return the {@code } operand value (variables are not resolved)
* @throws IllegalStateException if this operand has never been set
*
*/
public String[] getPaths() {
if (pathsIsSet) {
return paths;
}
throw new IllegalStateException("operand has not been set: " + paths);
}
/**
* Returns true if the {@code } operand has been set.
*
* Note that this method returns true even if {@code null} was passed to the
* {@link #setPaths(String[])} method.
*
* @return true if the setter for the {@code } operand has
* been called at least once
*/
public boolean isPathsSet() {
return pathsIsSet;
}
/**
* Sets {@code }: Pathnames of the input files to be printed; wildcards * and ? are
supported; relative paths are resolved on the basis of the current
working directory.
*
* @param paths the value for the {@code } operand
*/
public void setPaths(String... paths) {
this.paths = paths;
this.pathsIsSet = true;
}
/**
* Returns the {@code } operand value: String arguments defining the options and file operands for the
command. Options can be specified by acronym (with a leading dash
"-") or by long name (with two leading dashes "--"). File arguments
are expanded if wildcards are used.
*
* @return the {@code } operand value (variables are not resolved)
* @throws IllegalStateException if this operand has never been set
*
*/
public String[] getArgs() {
if (argsIsSet) {
return args;
}
throw new IllegalStateException("operand has not been set: " + args);
}
/**
* Returns true if the {@code } operand has been set.
*
* @return true if the setter for the {@code } operand has
* been called at least once
*/
public boolean isArgsSet() {
return argsIsSet;
}
/**
* Returns true if the {@code --}{@link CatOption#numberNonBlankLines numberNonBlankLines} option
* is set. The option is also known as {@code -}b option.
*
* Description: Number the non-blank output lines, starting at 1.
*
* @return true if the {@code --numberNonBlankLines} or {@code -b} option is set
*/
public boolean isNumberNonBlankLines() {
return getOptions().isSet(CatOption.numberNonBlankLines);
}
/**
* Returns true if the {@code --}{@link CatOption#numberLines numberLines} option
* is set. The option is also known as {@code -}n option.
*
* Description: Number the output lines, starting at 1.
*
* @return true if the {@code --numberLines} or {@code -n} option is set
*/
public boolean isNumberLines() {
return getOptions().isSet(CatOption.numberLines);
}
/**
* Returns true if the {@code --}{@link CatOption#squeezeEmptyLines squeezeEmptyLines} option
* is set. The option is also known as {@code -}s option.
*
* Description: Squeeze multiple adjacent empty lines, causing the output to be
single spaced.
*
* @return true if the {@code --squeezeEmptyLines} or {@code -s} option is set
*/
public boolean isSqueezeEmptyLines() {
return getOptions().isSet(CatOption.squeezeEmptyLines);
}
@Override
public String toString() {
// ok, we have options or arguments or both
final StringBuilder sb = new StringBuilder();
if (argsIsSet) {
for (String arg : args) {
if (sb.length() > 0) sb.append(' ');
sb.append(arg);
}
} else {
// first the options
if (options.size() > 0) {
sb.append(DefaultOptionSet.toString(options));
}
// operand:
if (filesIsSet) {
if (sb.length() > 0) sb.append(' ');
sb.append("--").append("files");
sb.append(" ").append(toString(getFiles()));
}
// operand:
if (pathsIsSet) {
if (sb.length() > 0) sb.append(' ');
sb.append("--").append("paths");
sb.append(" ").append(toString(getPaths()));
}
// operand:
if (argsIsSet) {
if (sb.length() > 0) sb.append(' ');
sb.append("--").append("args");
sb.append(" ").append(toString(getArgs()));
}
}
return sb.toString();
}
private static String toString(Object value) {
if (value != null && value.getClass().isArray()) {
return ArrayUtil.toString(value);
}
return String.valueOf(value);
}
}
