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/*
* Copyright 2009 Mike Cumings
*
* 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.kenai.jbosh;
/**
* Data type representing the getValue of the {@code ver} attribute of the
* {@code bosh} element.
*/
final class AttrVersion extends AbstractAttr<String> implements Comparable {
/**
* Default value if none is provided.
*/
private static final AttrVersion DEFAULT;
static {
try {
DEFAULT = createFromString("1.8");
} catch (BOSHException boshx) {
throw(new IllegalStateException(boshx));
}
}
/**
* Major portion of the version.
*/
private final int major;
/**
* Minor portion of the version.
*/
private final int minor;
/**
* Creates a new attribute object.
*
* @param val attribute getValue
* @throws BOSHException on parse or validation failure
*/
private AttrVersion(final String val) throws BOSHException {
super(val);
int idx = val.indexOf('.');
if (idx <= 0) {
throw(new BOSHException(
"Illegal ver attribute value (not in major.minor form): "
+ val));
}
String majorStr = val.substring(0, idx);
try {
major = Integer.parseInt(majorStr);
} catch (NumberFormatException nfx) {
throw(new BOSHException(
"Could not parse ver attribute value (major ver): "
+ majorStr,
nfx));
}
if (major < 0) {
throw(new BOSHException(
"Major version may not be < 0"));
}
String minorStr = val.substring(idx + 1);
try {
minor = Integer.parseInt(minorStr);
} catch (NumberFormatException nfx) {
throw(new BOSHException(
"Could not parse ver attribute value (minor ver): "
+ minorStr,
nfx));
}
if (minor < 0) {
throw(new BOSHException(
"Minor version may not be < 0"));
}
}
/**
* Get the version of specifcation that we support.
*
* @return max spec version the code supports
*/
static AttrVersion getSupportedVersion() {
return DEFAULT;
}
/**
* Creates a new attribute instance from the provided String.
*
* @param str string representation of the attribute
* @return attribute instance or {@code null} if provided string is
* {@code null}
* @throws BOSHException on parse or validation failure
*/
static AttrVersion createFromString(final String str)
throws BOSHException {
if (str == null) {
return null;
} else {
return new AttrVersion(str);
}
}
/**
* Returns the 'major' portion of the version number.
*
* @return major digits only
*/
int getMajor() {
return major;
}
/**
* Returns the 'minor' portion of the version number.
*
* @return minor digits only
*/
int getMinor() {
return minor;
}
///////////////////////////////////////////////////////////////////////////
// Comparable interface:
/**
* {@inheritDoc}
*
* @param otherObj object to compare to
* @return -1, 0, or 1
*/
@Override
public int compareTo(final Object otherObj) {
if (otherObj instanceof AttrVersion) {
AttrVersion other = (AttrVersion) otherObj;
if (major < other.major) {
return -1;
} else if (major > other.major) {
return 1;
} else if (minor < other.minor) {
return -1;
} else if (minor > other.minor) {
return 1;
} else {
return 0;
}
} else {
return 0;
}
}
}
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