
net.automatalib.words.impl.SimpleAlphabet Maven / Gradle / Ivy
/* Copyright (C) 2013 TU Dortmund
* This file is part of AutomataLib, http://www.automatalib.net/.
*
* AutomataLib is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 3.0 as published by the Free Software Foundation.
*
* AutomataLib 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 AutomataLib; if not, see
* http://www.gnu.de/documents/lgpl.en.html.
*/
package net.automatalib.words.impl;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.annotation.Nonnull;
import net.automatalib.words.GrowingAlphabet;
import net.automatalib.words.abstractimpl.AbstractAlphabet;
/**
* A simple alphabet implementation, that does not impose any restriction on the input
* symbol class. However, the id lookup for a symbol might be slightly slower.
*
* @author Malte Isberner
*
* @param input symbol class.
*/
public class SimpleAlphabet extends AbstractAlphabet implements GrowingAlphabet {
@Nonnull
private final List symbols = new ArrayList();
@Nonnull
private final Map indexMap = new HashMap();
/*
* (non-Javadoc)
* @see java.util.AbstractList#add(java.lang.Object)
*/
@Override
public boolean add(I a) {
int s = size();
int idx = addSymbol(a);
if(idx != s)
return false;
return true;
}
/*
* (non-Javadoc)
* @see net.automatalib.words.GrowingAlphabet#addSymbol(java.lang.Object)
*/
@Override
public int addSymbol(I a) {
Integer idx = indexMap.get(a);
if(idx != null)
return idx;
idx = size();
symbols.add(a);
indexMap.put(a, idx);
return idx;
}
/*
* (non-Javadoc)
* @see java.util.AbstractList#iterator()
*/
@Override
public Iterator iterator() {
return Collections.unmodifiableList(symbols).iterator();
}
/*
* (non-Javadoc)
* @see java.util.AbstractCollection#size()
*/
@Override
public int size() {
return symbols.size();
}
/*
* (non-Javadoc)
* @see de.ls5.words.Alphabet#getSymbol(int)
*/
@Override
public I getSymbol(int index) {
return symbols.get(index);
}
/*
* (non-Javadoc)
* @see de.ls5.words.Alphabet#getSymbolIndex(java.lang.Object)
*/
@Override
public int getSymbolIndex(I symbol) {
return indexMap.get(symbol);
}
/*
* (non-Javadoc)
* @see java.util.AbstractList#get(int)
*/
@Override
public I get(int index) {
return getSymbol(index);
}
/*
* (non-Javadoc)
* @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
*/
@Override
public int compare(I o1, I o2) {
return indexMap.get(o1) - indexMap.get(o2);
}
}
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