org.apache.juneau.svl.VarResolverBuilder Maven / Gradle / Ivy
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// * *
// * http://www.apache.org/licenses/LICENSE-2.0 *
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package org.apache.juneau.svl;
import static org.apache.juneau.internal.ClassUtils.*;
import java.util.*;
import org.apache.juneau.svl.vars.*;
/**
* Builder class for building instances of {@link VarResolver}.
*/
public class VarResolverBuilder {
private final List> vars = new ArrayList>();
private final Map contextObjects = new HashMap();
/**
* Create a new var resolver using the settings in this builder.
*
* @return A new var resolver.
*/
@SuppressWarnings("unchecked")
public VarResolver build() {
return new VarResolver(vars.toArray(new Class[vars.size()]), contextObjects);
}
/**
* Register new variables with this resolver.
*
* @param vars
* The variable resolver classes.
* These classes must subclass from {@link Var} and have no-arg constructors.
* @return This object (for method chaining).
*/
@SuppressWarnings("unchecked")
public VarResolverBuilder vars(Class...vars) {
for (Class v : vars) {
newInstance(Var.class, v);
this.vars.add((Class)v);
}
return this;
}
/**
* Adds the default variables to this builder.
*
*
* The default variables are:
*
* - {@link SystemPropertiesVar}
*
- {@link EnvVariablesVar}
*
- {@link SwitchVar}
*
- {@link IfVar}
*
*
* @return This object (for method chaining).
*/
public VarResolverBuilder defaultVars() {
return vars(SystemPropertiesVar.class, EnvVariablesVar.class, SwitchVar.class, IfVar.class);
}
/**
* Associates a context object with this resolver.
*
*
* A context object is essentially some environmental object that doesn't change but is used by vars to customize
* output.
*
* @param name The name of the context object.
* @param object The context object.
* @return This object (for method chaining).
*/
public VarResolverBuilder contextObject(String name, Object object) {
contextObjects.put(name, object);
return this;
}
/**
* Associates multiple context objects with this resolver.
*
*
* A context object is essentially some environmental object that doesn't change but is used by vars to customize
* output.
*
* @param map A map of context objects keyed by their name.
* @return This object (for method chaining).
*/
public VarResolverBuilder contextObjects(Map map) {
contextObjects.putAll(map);
return this;
}
}