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IsReachable (Apache Ant API)
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org.apache.tools.ant.taskdefs.condition</FONT>
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Class IsReachable</H2>
<PRE>
java.lang.Object
  <IMG SRC="../../../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../../../org/apache/tools/ant/ProjectComponent.html" title="class in org.apache.tools.ant">org.apache.tools.ant.ProjectComponent</A>
      <IMG SRC="../../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.tools.ant.taskdefs.condition.IsReachable</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD>java.lang.Cloneable, <A HREF="../../../../../../org/apache/tools/ant/taskdefs/condition/Condition.html" title="interface in org.apache.tools.ant.taskdefs.condition">Condition</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public class <B>IsReachable</B><DT>extends <A HREF="../../../../../../org/apache/tools/ant/ProjectComponent.html" title="class in org.apache.tools.ant">ProjectComponent</A><DT>implements <A HREF="../../../../../../org/apache/tools/ant/taskdefs/condition/Condition.html" title="interface in org.apache.tools.ant.taskdefs.condition">Condition</A></DL>
</PRE>

<P>
Test for a host being reachable using ICMP "ping" packets & echo operations.
 Ping packets are very reliable for assessing reachability in a LAN or WAN,
 but they do not get through any well-configured firewall. Echo (port 7) may.
 <p/>
 This condition turns unknown host exceptions into false conditions. This is
 because on a laptop, DNS is one of the first services lost when the network
 goes; you are implicitly offline.
 <p/>
 If a URL is supplied instead of a host, the hostname is extracted and used in
 the test--all other parts of the URL are discarded.
 <p/>
 The test may not work through firewalls; that is, something may be reachable
 using a protocol such as HTTP, while the lower level ICMP packets get dropped
 on the floor. Similarly, a host may be detected as reachable with ICMP, but not
 reachable on other ports (i.e. port 80), because of firewalls.
 <p/>
 Requires Java 5+ to work properly. On Java 1.4, if a hostname
 can be resolved, the destination is assumed to be reachable.
<P>

<P>
<DL>
<DT><B>Since:</B></DT>
  <DD>Ant 1.7</DD>
</DL>
<HR>

<A NAME="field_summary"></A>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/tools/ant/taskdefs/condition/IsReachable.html#DEFAULT_TIMEOUT">DEFAULT_TIMEOUT</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The default timeout.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/tools/ant/taskdefs/condition/IsReachable.html#ERROR_BAD_TIMEOUT">ERROR_BAD_TIMEOUT</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Error when invalid timeout value is defined</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/tools/ant/taskdefs/condition/IsReachable.html#ERROR_BAD_URL">ERROR_BAD_URL</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Error message when an invalid url is used.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/tools/ant/taskdefs/condition/IsReachable.html#ERROR_BOTH_TARGETS">ERROR_BOTH_TARGETS</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Error message when url and host are specified.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/tools/ant/taskdefs/condition/IsReachable.html#ERROR_NO_HOST_IN_URL">ERROR_NO_HOST_IN_URL</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Error message when no hostname in url.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/tools/ant/taskdefs/condition/IsReachable.html#ERROR_NO_HOSTNAME">ERROR_NO_HOSTNAME</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Error when no hostname is defined</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/tools/ant/taskdefs/condition/IsReachable.html#ERROR_ON_NETWORK">ERROR_ON_NETWORK</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Network error message is seen.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/tools/ant/taskdefs/condition/IsReachable.html#METHOD_NAME">METHOD_NAME</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The method name to look for in InetAddress</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/tools/ant/taskdefs/condition/IsReachable.html#MSG_NO_REACHABLE_TEST">MSG_NO_REACHABLE_TEST</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Error message when no reachably test avail.</TD>
</TR>
</TABLE>
&nbsp;<A NAME="fields_inherited_from_class_org.apache.tools.ant.ProjectComponent"></A>
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<TH ALIGN="left"><B>Fields inherited from class org.apache.tools.ant.<A HREF="../../../../../../org/apache/tools/ant/ProjectComponent.html" title="class in org.apache.tools.ant">ProjectComponent</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../../../org/apache/tools/ant/ProjectComponent.html#description">description</A>, <A HREF="../../../../../../org/apache/tools/ant/ProjectComponent.html#location">location</A>, <A HREF="../../../../../../org/apache/tools/ant/ProjectComponent.html#project">project</A></CODE></TD>
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<A NAME="constructor_summary"></A>
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<TD><CODE><B><A HREF="../../../../../../org/apache/tools/ant/taskdefs/condition/IsReachable.html#IsReachable()">IsReachable</A></B>()</CODE>

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<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/tools/ant/taskdefs/condition/IsReachable.html#eval()">eval</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Evaluate the condition.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/tools/ant/taskdefs/condition/IsReachable.html#setHost(java.lang.String)">setHost</A></B>(java.lang.String&nbsp;host)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the host to ping.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/tools/ant/taskdefs/condition/IsReachable.html#setTimeout(int)">setTimeout</A></B>(int&nbsp;timeout)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the timeout for the reachability test in seconds.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/tools/ant/taskdefs/condition/IsReachable.html#setUrl(java.lang.String)">setUrl</A></B>(java.lang.String&nbsp;url)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the URL from which to extract the hostname.</TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_org.apache.tools.ant.ProjectComponent"></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class org.apache.tools.ant.<A HREF="../../../../../../org/apache/tools/ant/ProjectComponent.html" title="class in org.apache.tools.ant">ProjectComponent</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../../../org/apache/tools/ant/ProjectComponent.html#clone()">clone</A>, <A HREF="../../../../../../org/apache/tools/ant/ProjectComponent.html#getDescription()">getDescription</A>, <A HREF="../../../../../../org/apache/tools/ant/ProjectComponent.html#getLocation()">getLocation</A>, <A HREF="../../../../../../org/apache/tools/ant/ProjectComponent.html#getProject()">getProject</A>, <A HREF="../../../../../../org/apache/tools/ant/ProjectComponent.html#log(java.lang.String)">log</A>, <A HREF="../../../../../../org/apache/tools/ant/ProjectComponent.html#log(java.lang.String, int)">log</A>, <A HREF="../../../../../../org/apache/tools/ant/ProjectComponent.html#setDescription(java.lang.String)">setDescription</A>, <A HREF="../../../../../../org/apache/tools/ant/ProjectComponent.html#setLocation(org.apache.tools.ant.Location)">setLocation</A>, <A HREF="../../../../../../org/apache/tools/ant/ProjectComponent.html#setProject(org.apache.tools.ant.Project)">setProject</A></CODE></TD>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
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<TD><CODE>equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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<A NAME="DEFAULT_TIMEOUT"></A><H3>
DEFAULT_TIMEOUT</H3>
<PRE>
public static final int <B>DEFAULT_TIMEOUT</B></PRE>
<DL>
<DD>The default timeout.
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.tools.ant.taskdefs.condition.IsReachable.DEFAULT_TIMEOUT">Constant Field Values</A></DL>
</DL>
<HR>

<A NAME="ERROR_NO_HOSTNAME"></A><H3>
ERROR_NO_HOSTNAME</H3>
<PRE>
public static final java.lang.String <B>ERROR_NO_HOSTNAME</B></PRE>
<DL>
<DD>Error when no hostname is defined
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.tools.ant.taskdefs.condition.IsReachable.ERROR_NO_HOSTNAME">Constant Field Values</A></DL>
</DL>
<HR>

<A NAME="ERROR_BAD_TIMEOUT"></A><H3>
ERROR_BAD_TIMEOUT</H3>
<PRE>
public static final java.lang.String <B>ERROR_BAD_TIMEOUT</B></PRE>
<DL>
<DD>Error when invalid timeout value is defined
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.tools.ant.taskdefs.condition.IsReachable.ERROR_BAD_TIMEOUT">Constant Field Values</A></DL>
</DL>
<HR>

<A NAME="ERROR_ON_NETWORK"></A><H3>
ERROR_ON_NETWORK</H3>
<PRE>
public static final java.lang.String <B>ERROR_ON_NETWORK</B></PRE>
<DL>
<DD>Network error message is seen.
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.tools.ant.taskdefs.condition.IsReachable.ERROR_ON_NETWORK">Constant Field Values</A></DL>
</DL>
<HR>

<A NAME="ERROR_BOTH_TARGETS"></A><H3>
ERROR_BOTH_TARGETS</H3>
<PRE>
public static final java.lang.String <B>ERROR_BOTH_TARGETS</B></PRE>
<DL>
<DD>Error message when url and host are specified.
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.tools.ant.taskdefs.condition.IsReachable.ERROR_BOTH_TARGETS">Constant Field Values</A></DL>
</DL>
<HR>

<A NAME="MSG_NO_REACHABLE_TEST"></A><H3>
MSG_NO_REACHABLE_TEST</H3>
<PRE>
public static final java.lang.String <B>MSG_NO_REACHABLE_TEST</B></PRE>
<DL>
<DD>Error message when no reachably test avail.
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.tools.ant.taskdefs.condition.IsReachable.MSG_NO_REACHABLE_TEST">Constant Field Values</A></DL>
</DL>
<HR>

<A NAME="ERROR_BAD_URL"></A><H3>
ERROR_BAD_URL</H3>
<PRE>
public static final java.lang.String <B>ERROR_BAD_URL</B></PRE>
<DL>
<DD>Error message when an invalid url is used.
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.tools.ant.taskdefs.condition.IsReachable.ERROR_BAD_URL">Constant Field Values</A></DL>
</DL>
<HR>

<A NAME="ERROR_NO_HOST_IN_URL"></A><H3>
ERROR_NO_HOST_IN_URL</H3>
<PRE>
public static final java.lang.String <B>ERROR_NO_HOST_IN_URL</B></PRE>
<DL>
<DD>Error message when no hostname in url.
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.tools.ant.taskdefs.condition.IsReachable.ERROR_NO_HOST_IN_URL">Constant Field Values</A></DL>
</DL>
<HR>

<A NAME="METHOD_NAME"></A><H3>
METHOD_NAME</H3>
<PRE>
public static final java.lang.String <B>METHOD_NAME</B></PRE>
<DL>
<DD>The method name to look for in InetAddress
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.tools.ant.taskdefs.condition.IsReachable.METHOD_NAME">Constant Field Values</A></DL>
</DL>

<A NAME="constructor_detail"></A>
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<A NAME="IsReachable()"></A><H3>
IsReachable</H3>
<PRE>
public <B>IsReachable</B>()</PRE>
<DL>
</DL>

<A NAME="method_detail"></A>
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<A NAME="setHost(java.lang.String)"></A><H3>
setHost</H3>
<PRE>
public void <B>setHost</B>(java.lang.String&nbsp;host)</PRE>
<DL>
<DD>Set the host to ping.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>host</CODE> - the host to ping.</DL>
</DD>
</DL>
<HR>

<A NAME="setUrl(java.lang.String)"></A><H3>
setUrl</H3>
<PRE>
public void <B>setUrl</B>(java.lang.String&nbsp;url)</PRE>
<DL>
<DD>Set the URL from which to extract the hostname.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>url</CODE> - a URL object.</DL>
</DD>
</DL>
<HR>

<A NAME="setTimeout(int)"></A><H3>
setTimeout</H3>
<PRE>
public void <B>setTimeout</B>(int&nbsp;timeout)</PRE>
<DL>
<DD>Set the timeout for the reachability test in seconds.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>timeout</CODE> - the timeout in seconds.</DL>
</DD>
</DL>
<HR>

<A NAME="eval()"></A><H3>
eval</H3>
<PRE>
public boolean <B>eval</B>()
             throws <A HREF="../../../../../../org/apache/tools/ant/BuildException.html" title="class in org.apache.tools.ant">BuildException</A></PRE>
<DL>
<DD>Evaluate the condition.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/tools/ant/taskdefs/condition/Condition.html#eval()">eval</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/tools/ant/taskdefs/condition/Condition.html" title="interface in org.apache.tools.ant.taskdefs.condition">Condition</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>true if the condition is true.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../../org/apache/tools/ant/BuildException.html" title="class in org.apache.tools.ant">BuildException</A></CODE> - if an error occurs</DL>
</DD>
</DL>

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