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Utilities for creating more complex shell commands with subcommands. It provides easy ability to
parse the users command line input.
/*
* LICENSE
*
* "THE BEER-WARE LICENSE" (Revision 43):
* "Sven Strittmatter" <[email protected]> wrote this file.
* As long as you retain this notice you can do whatever you want with
* this stuff. If we meet some day, and you think this stuff is worth it,
* you can buy me a non alcohol-free beer in return.
*
* Copyright (C) 2012 "Sven Strittmatter" <[email protected]>
*/
package de.weltraumschaf.commons.token;
import de.weltraumschaf.commons.guava.Objects;
import de.weltraumschaf.commons.validate.Validate;
/**
* Base token implementation with generic value.
*
* @since 1.0.0
* @param type of the recognized value
* @author Sven Strittmatter <[email protected]>
*/
abstract class BaseToken implements Token {
/**
* Token class type.
*/
private final TokenType type;
/**
* Start position of token.
*/
private final Position position;
/**
* Raw scanned lexeme.
*/
private final String raw;
/**
* Recognized typed token value.
*/
private final T value;
/**
* Dedicated constructor .
*
* @param type must not be {@code null}
* @param position must not be {@code null}
* @param raw must not be {@code null}
* @param value must not be {@code null}
*/
public BaseToken(final TokenType type, final Position position, final String raw, final T value) {
super();
this.type = Validate.notNull(type, "type");
this.position = Validate.notNull(position, "position");
this.raw = Validate.notNull(raw, "raw");
this.value = Validate.notNull(value, "value");
}
/** {@inheritDoc} */
@Override
public final TokenType getType() {
return type;
}
/** {@inheritDoc} */
@Override
public final Position getPosition() {
return position;
}
/** {@inheritDoc} */
@Override
public final String getRaw() {
return raw;
}
/**
* Get the typed value.
*
* @return must not be {@code null}
*/
final T getValue() {
return value;
}
/** {@inheritDoc} */
@Override
public final int hashCode() {
return Objects.hashCode(type, position, raw, value);
}
/** {@inheritDoc} */
@Override
public final boolean equals(final Object obj) {
if (!(obj instanceof BaseToken)) {
return false;
}
final BaseToken other = (BaseToken) obj;
return Objects.equal(type, other.type)
&& Objects.equal(position, other.position)
&& Objects.equal(raw, other.raw)
&& Objects.equal(value, other.value);
}
/** {@inheritDoc} */
@Override
public final String toString() {
return Objects.toStringHelper(this)
.add("type", type)
.add("position", position)
.add("raw", raw)
.add("value", value)
.toString();
}
/** {@inheritDoc} */
@Override
public String asString() {
return value.toString();
}
/**
* Concrete implementation of boolean token.
*/
static final class BooleanToken extends BaseToken {
/**
* Dedicated constructor.
*
* @param position must not be {@code null}
* @param raw must not be {@code null}
* @param value must not be {@code null}
*/
public BooleanToken(final Position position, final String raw, final Boolean value) {
super(TokenType.BOOLEAN, position, raw, value);
}
@Override
public Boolean asBoolean() {
return getValue();
}
@Override
public Float asFloat() {
return getValue() ? 1.0f : 0.0f;
}
@Override
public Integer asInteger() {
return getValue() ? 1 : 0;
}
}
/**
* Concrete implementation of boolean token.
*/
static final class IntegerToken extends BaseToken {
/**
* Dedicated constructor.
*
* @param position must not be {@code null}
* @param raw must not be {@code null}
* @param value must not be {@code null}
*/
public IntegerToken(final Position position, final String raw, final Integer value) {
super(TokenType.INTEGER, position, raw, value);
}
@Override
public Boolean asBoolean() {
return getValue() != 0;
}
@Override
public Float asFloat() {
return getValue() + 0.0f;
}
@Override
public Integer asInteger() {
return getValue();
}
}
/**
* Concrete implementation of boolean token.
*/
static final class FloatToken extends BaseToken {
/**
* Dedicated constructor.
*
* @param position must not be {@code null}
* @param raw must not be {@code null}
* @param value must not be {@code null}
*/
public FloatToken(final Position position, final String raw, final Float value) {
super(TokenType.FLOAT, position, raw, value);
}
@Override
public Boolean asBoolean() {
return getValue() != 0.0f;
}
@Override
public Float asFloat() {
return getValue();
}
@Override
public Integer asInteger() {
return getValue().intValue();
}
}
/**
* Concrete implementation of boolean token.
*/
static class StringToken extends BaseToken {
/**
* Dedicated constructor.
*
* @param position must not be {@code null}
* @param raw must not be {@code null}
* @param value must not be {@code null}
*/
public StringToken(final Position position, final String raw, final String value) {
this(TokenType.STRING, position, raw, value);
}
/**
* Constructor for sub classes.
*
* @param type must not be {@code null}
* @param position must not be {@code null}
* @param raw must not be {@code null}
* @param value must not be {@code null}
*/
private StringToken(final TokenType type, final Position position, final String raw, final String value) {
super(type, position, raw, value);
}
@Override
public Boolean asBoolean() {
return !getValue().isEmpty();
}
@Override
public Float asFloat() {
return getValue().isEmpty() ? 0.0f : 1.0f;
}
@Override
public Integer asInteger() {
return getValue().isEmpty() ? 0 : 1;
}
}
/**
* Concrete implementation of boolean token.
*/
static final class KeywordToken extends StringToken {
/**
* Dedicated constructor.
*
* @param position must not be {@code null}
* @param raw must not be {@code null}
* @param value must not be {@code null}
*/
public KeywordToken(final Position position, final String raw, final String value) {
super(TokenType.KEYWORD, position, raw, value);
}
}
/**
* Concrete implementation of boolean token.
*/
static final class LiteralToken extends StringToken {
/**
* Dedicated constructor.
*
* @param position must not be {@code null}
* @param raw must not be {@code null}
* @param value must not be {@code null}
*/
public LiteralToken(final Position position, final String raw, final String value) {
super(TokenType.LITERAL, position, raw, value);
}
}
}