Class NetMask
- java.lang.Object
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- org.apache.catalina.util.NetMask
 
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 public final class NetMask extends java.lang.ObjectA class representing a CIDR netmask.The constructor takes a string as an argument which represents a netmask, as per the CIDR notation -- whether this netmask be IPv4 or IPv6. It then extracts the network address (before the /) and the CIDR prefix (after the /), and tells through the #matches() method whether a candidate InetAddressobject fits in the recorded range.As byte arrays as returned by InetAddress.getByName()are always in network byte order, finding a match is therefore as simple as testing whether the n first bits (where n is the CIDR) are the same in both byte arrays (the one of the network address and the one of the candidate address). We do that by first doing byte comparisons, then testing the last bits if any (that is, if the remainder of the integer division of the CIDR by 8 is not 0).As a bonus, if no '/' is found in the input, it is assumed that an exact address match is required. 
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Constructor SummaryConstructors Constructor Description NetMask(java.lang.String input)Constructor
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Method SummaryAll Methods Instance Methods Concrete Methods Modifier and Type Method Description booleanequals(java.lang.Object o)inthashCode()booleanmatches(java.net.InetAddress addr)Test if a given address matches this netmask.booleanmatches(java.net.InetAddress addr, boolean checkedPort)Test if a given address matches this netmask.booleanmatches(java.net.InetAddress addr, int port)Test if a given address and port matches this netmask.java.lang.StringtoString()
 
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Method Detail- 
matchespublic boolean matches(java.net.InetAddress addr, int port)Test if a given address and port matches this netmask.- Parameters:
- addr- The- InetAddressto test
- port- The port to test
- Returns:
- true on match, false otherwise
 
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matchespublic boolean matches(java.net.InetAddress addr) Test if a given address matches this netmask.- Parameters:
- addr- The- InetAddressto test
- Returns:
- true on match, false otherwise
 
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matchespublic boolean matches(java.net.InetAddress addr, boolean checkedPort)Test if a given address matches this netmask.- Parameters:
- addr- The- InetAddressto test
- checkedPort- Indicates, whether we already checked the port
- Returns:
- true on match, false otherwise
 
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toStringpublic java.lang.String toString() - Overrides:
- toStringin class- java.lang.Object
 
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equalspublic boolean equals(java.lang.Object o) - Overrides:
- equalsin class- java.lang.Object
 
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hashCodepublic int hashCode() - Overrides:
- hashCodein class- java.lang.Object
 
 
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