org.mvel2.ast.Convertable Maven / Gradle / Ivy
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TBEL is a powerful expression language for ThingsBoard platform user-defined functions.
Original implementation is based on MVEL.
package org.mvel2.ast;
import org.mvel2.DataConversion;
import org.mvel2.ParserContext;
import org.mvel2.integration.VariableResolverFactory;
import org.mvel2.util.CompilerTools;
public class Convertable extends ASTNode {
private ASTNode stmt;
private ASTNode clsStmt;
public Convertable(ASTNode stmt, ASTNode clsStmt, ParserContext pCtx) {
super(pCtx);
this.stmt = stmt;
this.clsStmt = clsStmt;
CompilerTools.expectType(pCtx, clsStmt, Class.class, true);
}
public Object getReducedValueAccelerated(Object ctx, Object thisValue, VariableResolverFactory factory) {
Object o = stmt.getReducedValueAccelerated(ctx, thisValue, factory);
return o != null && DataConversion.canConvert(
(Class) clsStmt.getReducedValueAccelerated(ctx, thisValue, factory), o.getClass());
}
public Object getReducedValue(Object ctx, Object thisValue, VariableResolverFactory factory) {
try {
Object o = stmt.getReducedValue(ctx, thisValue, factory);
if (o == null) return false;
Class i = (Class) clsStmt.getReducedValue(ctx, thisValue, factory);
if (i == null) throw new ClassCastException();
return DataConversion.canConvert(i, o.getClass());
}
catch (ClassCastException e) {
throw new RuntimeException("not a class reference: " + clsStmt.getName());
}
}
public Class getEgressType() {
return Boolean.class;
}
}