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Simple library for generating code.
/*
* Copyright (c) "Neo4j"
* Neo4j Sweden AB [https://neo4j.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see typeParameters() {
return unmodifiableList(asList(typeParameters));
}
public List throwsList() {
return unmodifiableList(asList(exceptions));
}
public abstract static class Builder {
private LinkedHashMap typeParameters;
public Builder parameterizedWith(String name, TypeReference.Bound bound) {
if (typeParameters == null) {
typeParameters = new LinkedHashMap<>();
} else if (typeParameters.containsKey(name)) {
throw new IllegalArgumentException(name + " defined twice");
}
typeParameters.put(name, bound);
return this;
}
public Builder throwsException(Class type) {
return throwsException(TypeReference.typeReference(type));
}
public Builder throwsException(TypeReference type) {
if (exceptions == null) {
exceptions = new ArrayList<>();
}
exceptions.add(type);
return this;
}
public Builder modifiers(int modifiers) {
this.modifiers = modifiers;
return this;
}
public int modifiers() {
return modifiers;
}
abstract MethodDeclaration build(TypeReference owner);
final Parameter[] parameters;
private List exceptions;
private int modifiers = Modifier.PUBLIC;
private Builder(Parameter[] parameters) {
this.parameters = parameters;
}
TypeReference[] exceptions() {
return exceptions == null ? NO_TYPES : exceptions.toArray(new TypeReference[0]);
}
TypeParameter[] typeParameters() {
if (typeParameters == null) {
return TypeParameter.NO_PARAMETERS;
} else {
TypeParameter[] result = new TypeParameter[typeParameters.size()];
int i = 0;
for (Map.Entry entry : typeParameters.entrySet()) {
result[i++] = new TypeParameter(entry.getKey(), entry.getValue());
}
return result;
}
}
}
private final TypeReference owner;
private final Parameter[] parameters;
private final TypeReference[] exceptions;
private final TypeParameter[] typeParameters;
private final int modifiers;
MethodDeclaration(
TypeReference owner,
Parameter[] parameters,
TypeReference[] exceptions,
int modifiers,
TypeParameter[] typeParameters) {
this.owner = owner;
this.parameters = parameters;
this.exceptions = exceptions;
this.modifiers = modifiers;
this.typeParameters = typeParameters;
}
public abstract boolean isConstructor();
public boolean isStatic() {
return Modifier.isStatic(modifiers);
}
public boolean isGeneric() {
if (returnType().isGeneric() || typeParameters.length != 0) {
return true;
}
for (Parameter parameter : parameters) {
if (parameter.type().isGeneric()) {
return true;
}
}
return false;
}
public TypeReference declaringClass() {
return owner;
}
public int modifiers() {
return modifiers;
}
public abstract TypeReference returnType();
public abstract String name();
public Parameter[] parameters() {
return parameters;
}
public MethodDeclaration erased() {
Map table = new HashMap<>();
for (TypeParameter parameter : typeParameters) {
table.put(parameter.name(), parameter.extendsBound());
}
TypeReference newReturnType = erase(returnType(), table);
Parameter[] newParameters = new Parameter[this.parameters.length];
for (int i = 0; i < parameters.length; i++) {
Parameter parameter = parameters[i];
TypeReference erasedType = erase(parameter.type(), table);
newParameters[i] = param(erasedType, parameter.name());
}
TypeReference[] newExceptions = new TypeReference[exceptions.length];
for (int i = 0; i < exceptions.length; i++) {
newExceptions[i] = erase(exceptions[i], table);
}
String newName = name();
boolean newIsConstructor = isConstructor();
return methodDeclaration(
owner,
newReturnType,
newParameters,
newExceptions,
newName,
newIsConstructor,
modifiers,
typeParameters);
}
private static TypeReference erase(TypeReference reference, Map table) {
TypeReference erasedReference = table.get(reference.fullName());
return erasedReference != null ? erasedReference : reference;
}
static MethodDeclaration method(
TypeReference owner,
final TypeReference returnType,
final String name,
Parameter[] parameters,
TypeReference[] exceptions,
int modifiers,
TypeParameter[] typeParameters) {
return methodDeclaration(owner, returnType, parameters, exceptions, name, false, modifiers, typeParameters);
}
static MethodDeclaration constructor(
TypeReference owner,
Parameter[] parameters,
TypeReference[] exceptions,
int modifiers,
TypeParameter[] typeParameters) {
return methodDeclaration(
owner, TypeReference.VOID, parameters, exceptions, "", true, modifiers, typeParameters);
}
public static class TypeParameter {
static final TypeParameter[] NO_PARAMETERS = {};
final String name;
final TypeReference.Bound bound;
TypeParameter(String name, TypeReference.Bound bound) {
this.name = name;
this.bound = bound;
}
public String name() {
return name;
}
public TypeReference extendsBound() {
return bound.extendsBound();
}
public TypeReference superBound() {
return bound.superBound();
}
}
private static MethodDeclaration methodDeclaration(
TypeReference owner,
final TypeReference returnType,
final Parameter[] parameters,
final TypeReference[] exceptions,
final String name,
final boolean isConstructor,
int modifiers,
TypeParameter[] typeParameters) {
return new MethodDeclaration(owner, parameters, exceptions, modifiers, typeParameters) {
@Override
public boolean isConstructor() {
return isConstructor;
}
@Override
public TypeReference returnType() {
return returnType;
}
@Override
public String name() {
return name;
}
};
}
}