gw.lang.parser.coercers.BaseCoercer Maven / Gradle / Ivy
/*
* Copyright 2014 Guidewire Software, Inc.
*/
package gw.lang.parser.coercers;
import gw.lang.parser.ICoercer;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
public abstract class BaseCoercer implements ICoercer
{
public BaseCoercer()
{
Class thisClass = this.getClass();
if( !thisClass.getName().endsWith( "Coercer" ) )
{
throw new IllegalStateException( "All coercers must have a name ending with 'Coercer': " + this.getClass().getName() );
}
if (!(this instanceof BasePrimitiveCoercer)) {
Method method = null;
try
{
method = thisClass.getMethod( "instance" );
if( !Modifier.isStatic( method.getModifiers() ) || !method.getReturnType().equals( thisClass ) )
{
method = null;
}
}
catch( NoSuchMethodException e )
{
//dealt with below
}
if( method == null )
{
throw new IllegalStateException( "This coercer must be a singleton that has a static method 'instance' with the return type " + thisClass.getName() );
}
}
}
}