com.disney.groovity.model.ModelVisitor Maven / Gradle / Ivy
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*
* Licensed under the Apache License, Version 2.0 (the "Apache License")
* with the following modification; you may not use this file except in
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*
* 6. Trademarks. This License does not grant permission to use the trade
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* the License and to reproduce the content of the NOTICE file.
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*
* http://www.apache.org/licenses/LICENSE-2.0
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package com.disney.groovity.model;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
* Defines a general API with abstract visit methods for the 5 primary modeled types;
* Object and Object Field, List and List Member, and Null. A default entry-point visit() method
* provides general purpose logic for routing to the other 5 visit methods based on the type of argument.
*
* @author Alex Vigdor
*
*/
public interface ModelVisitor extends ModelConsumer{
void visitNull() throws Exception;
@SuppressWarnings("rawtypes")
void visitList(Iterable iter) throws Exception;
void visitListMember(Object obj) throws Exception;
void visitObject(Object obj) throws Exception;
void visitObjectField(String name, Object value) throws Exception;
public default void call(String key, Object value) {
try {
visitObjectField(key, value);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public default Iterable toIterableIfPossible(Object obj) {
if(obj==null) {
return null;
}
if(obj instanceof Throwable) {
return null;
}
if(obj instanceof Iterable) {
return (Iterable) obj;
}
if(obj.getClass().isArray()) {
Class ct = obj.getClass().getComponentType();
if(ct.isPrimitive()) {
if(ct.equals(long.class)) {
List ll =new ArrayList<>();
for(long l : ((long[]) obj)) {
ll.add(l);
}
return ll;
}
if(ct.equals(int.class)) {
List ll =new ArrayList<>();
for(int l : ((int[]) obj)) {
ll.add(l);
}
return ll;
}
if(ct.equals(double.class)) {
List ll =new ArrayList<>();
for(double l : ((double[]) obj)) {
ll.add(l);
}
return ll;
}
if(ct.equals(float.class)) {
List ll =new ArrayList<>();
for(float l : ((float[]) obj)) {
ll.add(l);
}
return ll;
}
if(ct.equals(short.class)) {
List ll =new ArrayList<>();
for(short l : ((short[]) obj)) {
ll.add(l);
}
return ll;
}
if(ct.equals(boolean.class)) {
List ll =new ArrayList<>();
for(boolean l : ((boolean[]) obj)) {
ll.add(l);
}
return ll;
}
//intentionally don't handle char[], those should be treated as strings
}
else {
return Arrays.asList((Object[])obj);
}
}
return null;
}
@SuppressWarnings("rawtypes")
public default void visit(Object obj) throws Exception {
if(obj == null) {
visitNull();
return;
}
Iterable i = toIterableIfPossible(obj);
if(i!=null) {
visitList(i);
}
else {
if(obj.getClass().isArray() && obj.getClass().getComponentType().equals(char.class)) {
obj = new String((char[])obj);
}
visitObject(obj);
}
}
}