com.google.gwt.thirdparty.streamhtmlparser.impl.StateTableTransition Maven / Gradle / Ivy
/*
* Copyright (C) 2010 Google Inc.
*
* Licensed 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
*
* http://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 com.google.gwt.thirdparty.streamhtmlparser.impl;
import com.google.gwt.thirdparty.guava.common.base.Preconditions;
/**
* Holds one state transition as derived from a Python configuration
* file. A state transition is a triplet as follows:
*
* - An expression which consists of one or more characters and/or
* one or more range of characters.
*
- A source state.
*
- A destination state.
*
*
* For example, the triplet ("a-z123", A, B) will cause the
* state to go from A to B for any character that is either 1,2,3 or in
* the range a-z inclusive.
*/
class StateTableTransition {
private final String expression;
private final InternalState from;
private final InternalState to;
/**
* Returns the full state of the {@code StateTableTransition} in a
* human readable form. The format of the returned {@code String} is not
* specified and is subject to change.
*
* @return full state of the {@code StateTableTransition}
*/
@Override
public String toString() {
return String.format("Expression: %s; From: %s; To: %s",
expression, from, to);
}
StateTableTransition(String expression, InternalState from,
InternalState to) {
// Developer error if any triggers.
Preconditions.checkNotNull(expression);
Preconditions.checkNotNull(from);
Preconditions.checkNotNull(to);
this.expression = expression;
this.from = from;
this.to = to;
}
String getExpression() {
return expression;
}
InternalState getFrom() {
return from;
}
InternalState getTo() {
return to;
}
}