com.github.tcurrie.rest.factory.RestUriFactory Maven / Gradle / Ivy

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Simple rest client-server factory, you give it a url, it does the rest!

There is a newer version: 0.2.70

package com.github.tcurrie.rest.factory;

import com.github.tcurrie.rest.factory.v1.RestFactoryException;

import java.lang.reflect.Method;
import java.util.function.Supplier;

public class RestUriFactory {
    private static final RestUriFactory INSTANCE = new RestUriFactory();

    public static RestUriFactory getInstance() {
        return INSTANCE;
    }

    private RestUriFactory() {
    }

    public  RestUri create(final Supplier urlSupplier, final Class service, final Method method) {
        final String methodUri = create(service, method);
        return RestUri.create(() -> removeSlash(notNull(urlSupplier.get(), methodUri)), methodUri);
    }

    private String notNull(final String url, final String methodUri) {
        if (url == null) {
            throw new RestFactoryException(Strings.format("Invalid null url supplied for rest method [???{}]", methodUri));
        }
        return url;
    }

    String removeSlash(final String url) {
        return url.replaceAll("/*$", "");
    }

    public String create(final Class c, final Method m) {
        return "/" + getInterfaceName(c) + "/" + getVersion(c) + "/" + getMethod(m);
    }

    String getInterfaceName(final Class c) {
        return lowerHyphenate(c.getSimpleName());
    }

    String getVersion(final Class c) {
        final String parent = getCanonicalPart(c, -2);
        return parent != null && parent.matches("^[vV][\\d\\.]+$") ? parent.toLowerCase() : "v1";
    }

    String getCanonicalPart(final Class c, final int part) {
        final String[] parts = c.getCanonicalName().split("\\.");
        return part < parts.length && parts.length + part > -1 ?
                part < 0 ? parts[parts.length + part]
                        : parts[part]
                : null;
    }

    String getMethod(Method m) {
        return lowerHyphenate(m.getName());
    }

    String lowerHyphenate(final String value) {
        return value
                .replaceAll("([^_])_([^_])", "$1-$2")
                .replaceAll("_", "")
                .replaceAll("([a-z0-9])([A-Z])", "$1-$2")
                .toLowerCase();
    }

}