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package org.apache.juneau.svl; | |
import static org.apache.juneau.internal.StringUtils.*; | |
/** | |
* Interface for the resolution of vars that can have one or more keys where the first non-null resolution is returned. | |
* | |
* <p> | |
* For example, to resolve the system property <js>"myProperty"</js> but then resolve <js>"myProperty2"</js> if the | |
* property doesn't exist: <js>"$S{myProperty1,myProperty2}"</js> | |
* | |
* <p> | |
* Subclasses must implement the following method: | |
* <ul class='javatree'> | |
* <li class='jm'>{@link #resolve(VarResolverSession, String)} | |
* </ul> | |
* | |
* <ul class='seealso'> | |
* <li class='link'>{@doc juneau-marshall.SimpleVariableLanguage.SvlVariables} | |
* </ul> | |
*/ | |
public abstract class MultipartResolvingVar extends SimpleVar { | |
/** | |
* Constructor. | |
* | |
* @param name The name of this variable. | |
*/ | |
public MultipartResolvingVar(String name) { | |
super(name); | |
} | |
@Override /* Var*/ | |
public String doResolve(VarResolverSession session, String s) throws Exception { | |
int i = s.indexOf(','); | |
if (i == -1) | |
return resolve(session, s.trim()); | |
for (String s2 : split(s)) { | |
String v = resolve(session, s2); | |
if (v != null) | |
return v; | |
} | |
return null; | |
} | |
} |