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/*
* Copyright (C) 2015 The Android Open Source Project
*
* 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.android.tv.data;
import android.support.annotation.NonNull;
import android.view.KeyEvent;
/**
* A convenience class to handle channel number.
*/
public final class ChannelNumber implements Comparable<ChannelNumber> {
public static final String PRIMARY_CHANNEL_DELIMITER = "-";
public static final String[] CHANNEL_DELIMITERS = {"-", ".", " "};
private static final int[] CHANNEL_DELIMITER_KEYCODES = {
KeyEvent.KEYCODE_MINUS, KeyEvent.KEYCODE_NUMPAD_SUBTRACT, KeyEvent.KEYCODE_PERIOD,
KeyEvent.KEYCODE_NUMPAD_DOT, KeyEvent.KEYCODE_SPACE
};
public String majorNumber;
public boolean hasDelimiter;
public String minorNumber;
public ChannelNumber() {
reset();
}
public ChannelNumber(String major, boolean hasDelimiter, String minor) {
setChannelNumber(major, hasDelimiter, minor);
}
public void reset() {
setChannelNumber("", false, "");
}
public void setChannelNumber(String majorNumber, boolean hasDelimiter, String minorNumber) {
this.majorNumber = majorNumber;
this.hasDelimiter = hasDelimiter;
this.minorNumber = minorNumber;
}
@Override
public String toString() {
if (hasDelimiter) {
return majorNumber + PRIMARY_CHANNEL_DELIMITER + minorNumber;
}
return majorNumber;
}
@Override
public int compareTo(@NonNull ChannelNumber another) {
int major = Integer.parseInt(majorNumber);
int minor = hasDelimiter ? Integer.parseInt(minorNumber) : 0;
int opponentMajor = Integer.parseInt(another.majorNumber);
int opponentMinor = another.hasDelimiter
? Integer.parseInt(another.minorNumber) : 0;
if (major == opponentMajor) {
return minor - opponentMinor;
}
return major - opponentMajor;
}
public static boolean isChannelNumberDelimiterKey(int keyCode) {
for (int delimiterKeyCode : CHANNEL_DELIMITER_KEYCODES) {
if (delimiterKeyCode == keyCode) {
return true;
}
}
return false;
}
public static ChannelNumber parseChannelNumber(String number) {
if (number == null) {
return null;
}
ChannelNumber ret = new ChannelNumber();
int indexOfDelimiter = -1;
for (String delimiter : CHANNEL_DELIMITERS) {
indexOfDelimiter = number.indexOf(delimiter);
if (indexOfDelimiter >= 0) {
break;
}
}
if (indexOfDelimiter == 0 || indexOfDelimiter == number.length() - 1) {
return null;
}
if (indexOfDelimiter < 0) {
ret.majorNumber = number;
if (!isInteger(ret.majorNumber)) {
return null;
}
} else {
ret.hasDelimiter = true;
ret.majorNumber = number.substring(0, indexOfDelimiter);
ret.minorNumber = number.substring(indexOfDelimiter + 1);
if (!isInteger(ret.majorNumber) || !isInteger(ret.minorNumber)) {
return null;
}
}
return ret;
}
public static int compare(String lhs, String rhs) {
ChannelNumber lhsNumber = parseChannelNumber(lhs);
ChannelNumber rhsNumber = parseChannelNumber(rhs);
if (lhsNumber == null && rhsNumber == null) {
return 0;
} else if (lhsNumber == null /* && rhsNumber != null */) {
return -1;
} else if (lhsNumber != null && rhsNumber == null) {
return 1;
}
return lhsNumber.compareTo(rhsNumber);
}
public static boolean isInteger(String string) {
try {
Integer.parseInt(string);
} catch(NumberFormatException e) {
return false;
} catch(NullPointerException e) {
return false;
}
return true;
}
}
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