/*
* Flazr <http://flazr.com> Copyright (C) 2009 Peter Thomas.
*
* This file is part of Flazr.
*
* Flazr is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Flazr 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 Flazr. If not, see <http://www.gnu.org/licenses/>.
*/
package com.flazr.util;
import java.util.Arrays;
import com.flazr.rtmp.client.Amf0Value.MetaDataValuesType;
import com.flazr.rtmp.message.TypeEnum;
/**
* a little bit of code reuse, would have been cleaner if enum types
* could extend some other class - we implement an interface instead
* and have to construct a static instance in each enum type we use
*/
public class ValueToEnum<T extends TypeEnum> {
private final TypeEnum[] lookupArray;
private final int maxIndex;
public ValueToEnum(final TypeEnum[] enumValues) {
final int[] lookupIndexes = new int[enumValues.length];
for(int i = 0; i < enumValues.length; i++) {
lookupIndexes[i] = enumValues[i].intValue();
}
Arrays.sort(lookupIndexes);
maxIndex = lookupIndexes[lookupIndexes.length - 1];
lookupArray = new TypeEnum[maxIndex + 1]; // use 1 based index
for (final TypeEnum t : enumValues) {
lookupArray[t.intValue()] = t;
}
}
@SuppressWarnings("unchecked")
public T valueToEnum(final int i) {
final T t;
try {
t = (T) lookupArray[i];
} catch(Exception e) { // index out of bounds
throw new RuntimeException(getErrorLogMessage(i) + ", " + e);
}
if (t == null) {
throw new RuntimeException(getErrorLogMessage(i) + ", no match found in lookup");
}
return t;
}
public int getMaxIndex() {
return maxIndex;
}
private String getErrorLogMessage(final int i) {
return "bad value / byte: " + i + " (hex: " + String.valueOf(Utils.toHexChars((byte)i)) + ")";
}
}