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package com.github.javaparser.generator.core.visitor;
import com.github.javaparser.ast.CompilationUnit;
import com.github.javaparser.ast.body.MethodDeclaration;
import com.github.javaparser.ast.stmt.BlockStmt;
import com.github.javaparser.generator.VisitorGenerator;
import com.github.javaparser.utils.SeparatedItemStringBuilder;
import com.github.javaparser.utils.SourceRoot;
import com.github.javaparser.metamodel.BaseNodeMetaModel;
import com.github.javaparser.metamodel.PropertyMetaModel;
import java.util.List;
import static com.github.javaparser.JavaParser.parseStatement;
/**
* Generates JavaParser's HashCodeVisitor.
*/
public class HashCodeVisitorGenerator extends VisitorGenerator {
public HashCodeVisitorGenerator(SourceRoot sourceRoot) {
super(sourceRoot, "com.github.javaparser.ast.visitor", "HashCodeVisitor", "Integer", "Void", true);
}
@Override
protected void generateVisitMethodBody(BaseNodeMetaModel node, MethodDeclaration visitMethod, CompilationUnit compilationUnit) {
visitMethod.getParameters().forEach(p -> p.setFinal(true));
final BlockStmt body = visitMethod.getBody().get();
body.getStatements().clear();
final SeparatedItemStringBuilder builder = new SeparatedItemStringBuilder("return ", "* 31 +", ";");
final List<PropertyMetaModel> propertyMetaModels= node.getAllPropertyMetaModels();
if (propertyMetaModels.isEmpty()) {
builder.append("0");
} else {
for (PropertyMetaModel field : propertyMetaModels) {
final String getter = field.getGetterMethodName() + "()";
// Is this field another AST node? Visit it.
if (field.getNodeReference().isPresent()) {
if (field.isOptional()) {
builder.append("(n.%s.isPresent()? n.%s.get().accept(this, arg):0)", getter, getter);
} else {
builder.append("(n.%s.accept(this, arg))", getter);
}
} else {
Class<?> type = field.getType();
if (type.equals(boolean.class)) {
builder.append("(n.%s?1:0)", getter);
} else if (type.equals(int.class)) {
builder.append("n.%s", getter);
} else {
builder.append("(n.%s.hashCode())", getter);
}
}
}
}
body.addStatement(parseStatement(builder.toString()));
}
}
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