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Simple library for generating code.
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/*
 * 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 .
 */
package org.neo4j.codegen;

import static org.neo4j.codegen.TypeReference.typeReference;
import static org.neo4j.codegen.TypeReference.typeReferences;

import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

public class MethodReference {
    public static MethodReference methodReference(
            Class owner, Class returns, String name, Class... parameters) {
        try {
            int modifiers = owner.getMethod(name, parameters).getModifiers();
            return methodReference(
                    typeReference(owner), typeReference(returns), name, modifiers, typeReferences(parameters));
        } catch (NoSuchMethodException e) {
            throw new IllegalArgumentException("No method with name " + name, e);
        }
    }

    public static MethodReference methodReference(
            Class owner, TypeReference returns, String name, Class... parameters) {
        try {
            int modifiers = owner.getMethod(name, parameters).getModifiers();
            return methodReference(owner, returns, name, modifiers, typeReferences(parameters));
        } catch (NoSuchMethodException e) {
            throw new IllegalArgumentException("No method with name " + name, e);
        }
    }

    private static MethodReference methodReference(
            Class owner, TypeReference returns, String name, int modifiers, TypeReference... parameters) {
        return methodReference(typeReference(owner), returns, name, modifiers, parameters);
    }

    public static MethodReference methodReference(
            TypeReference owner, TypeReference returns, String name, TypeReference... parameters) {
        return new MethodReference(owner, name, returns, Modifier.PUBLIC, parameters);
    }

    public static MethodReference methodReference(
            TypeReference owner, TypeReference returns, String name, int modifiers, TypeReference... parameters) {
        return new MethodReference(owner, name, returns, modifiers, parameters);
    }

    public static MethodReference methodReference(Method method) {
        return methodReference(
                method.getDeclaringClass(), method.getReturnType(), method.getName(), method.getParameterTypes());
    }

    public static MethodReference constructorReference(
            Class owner, Class firstParameter, Class... parameters) {
        return constructorReference(typeReference(owner), typeReferences(firstParameter, parameters));
    }

    public static MethodReference constructorReference(Class owner, TypeReference... parameters) {
        return constructorReference(typeReference(owner), parameters);
    }

    public static MethodReference constructorReference(TypeReference owner, TypeReference... parameters) {
        return new MethodReference(owner, "", TypeReference.VOID, Modifier.PUBLIC, parameters);
    }

    private final TypeReference owner;
    private final String name;
    private final TypeReference returns;
    private final TypeReference[] parameters;
    private final int modifiers;

    MethodReference(
            TypeReference owner, String name, TypeReference returns, int modifiers, TypeReference[] parameters) {
        this.owner = owner;

        this.name = name;
        this.returns = returns;
        this.modifiers = modifiers;
        this.parameters = parameters;
    }

    public String name() {
        return name;
    }

    public TypeReference owner() {
        return owner;
    }

    public TypeReference returns() {
        return returns;
    }

    public TypeReference[] parameters() {
        return parameters;
    }

    public boolean isConstructor() {
        return "".equals(name);
    }

    public int modifiers() {
        return modifiers;
    }

    @Override
    public String toString() {
        StringBuilder result = new StringBuilder().append("MethodReference[");
        writeTo(result);
        return result.append(']').toString();
    }

    void writeTo(StringBuilder result) {
        owner.writeTo(result);
        result.append('#').append(name).append("(...)");
    }
}