package com.ajjpj.amapper.javabean.builder;
import com.ajjpj.amapper.core.tpe.AQualifier;
import com.ajjpj.amapper.javabean.JavaBeanType;
import com.ajjpj.amapper.javabean.builder.qualifier.AQualifierExtractor;
import com.ajjpj.amapper.javabean.propbased.accessors.AMethodPathBasedPropertyAccessor;
import com.ajjpj.amapper.javabean.propbased.accessors.AOgnlPropertyAccessor;
import com.ajjpj.amapper.javabean.propbased.accessors.APropertyAccessor;
import com.ajjpj.amapper.util.coll.AOption;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
/**
* @author arno
*/
public class ABeanExpressionParser {
private final AQualifierExtractor qualifierExtractor;
public ABeanExpressionParser(AQualifierExtractor qualifierExtractor) {
this.qualifierExtractor = qualifierExtractor;
}
public APropertyAccessor parse(Class<?> parentClass, String expression, JavaBeanType<?> tpe, boolean isDeferred) throws Exception {
final String[] segments = expression.split("\\.");
try {
switch(segments.length) {
case 1: return new JavaBeanSupport(new AIsDeferredStrategy.LiteralStrategy(isDeferred), qualifierExtractor).getBeanProperty(parentClass, expression).get();
default: return asPropCascade(parentClass, expression, segments, tpe, isDeferred);
}
}
catch(Exception exc) {
return new AOgnlPropertyAccessor(expression, expression, parentClass, isDeferred, tpe, AQualifier.NO_QUALIFIER, AQualifier.NO_QUALIFIER);
}
}
private APropertyAccessor asPropCascade(Class<?> parentClass, String propName, String[] segments, JavaBeanType<?> tpe, boolean isDeferred) throws Exception {
final List<AMethodPathBasedPropertyAccessor.Step> steps = new ArrayList<AMethodPathBasedPropertyAccessor.Step>();
final JavaBeanSupport beanSupport = new JavaBeanSupport(new AIsDeferredStrategy.LiteralStrategy(isDeferred), qualifierExtractor);
JavaBeanSupport.AccessorDetails lastGetterDetails = null;
Class<?> cur = parentClass;
for(String segRaw: segments) {
final boolean nullSafe = segRaw.startsWith("?");
final String seg = nullSafe ? segRaw.substring(1) : segRaw;
lastGetterDetails = beanSupport.getGetter(cur, seg).get();
steps.add(new AMethodPathBasedPropertyAccessor.Step(lastGetterDetails.method, nullSafe));
cur = lastGetterDetails.method.getReturnType();
}
final boolean isFinalStepNullSafe = steps.remove(steps.size()-1).isNullSafe();
final AOption<JavaBeanSupport.AccessorDetails> optFinalSetter = beanSupport.getSetterFor(lastGetterDetails.propName, lastGetterDetails.method);
final Method finalGetter = lastGetterDetails.method;
final Method finalSetter = optFinalSetter.isDefined() ? optFinalSetter.get().method : null;
final AQualifier sourceQualifier = lastGetterDetails.qualifier;
final AQualifier targetQualifier = optFinalSetter.isDefined() ? optFinalSetter.get().qualifier : AQualifier.NO_QUALIFIER;
return new AMethodPathBasedPropertyAccessor(propName, steps, finalGetter, finalSetter, isFinalStepNullSafe, isDeferred, tpe, sourceQualifier, targetQualifier);
}
}