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package org.glassfish.jersey.client;

import java.security.KeyStore;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.core.Configuration;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLContext;

import org.glassfish.jersey.SslConfigurator;
import org.glassfish.jersey.client.internal.LocalizationMessages;
import org.glassfish.jersey.internal.util.collection.UnsafeValue;
import org.glassfish.jersey.internal.util.collection.Values;

/**
 * Jersey provider of {@link javax.ws.rs.client.ClientBuilder JAX-RS client builder}.
 *
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
public class JerseyClientBuilder extends ClientBuilder {

    private final ClientConfig config;
    private HostnameVerifier hostnameVerifier;
    private SslConfigurator sslConfigurator;
    private SSLContext sslContext;
    private ExecutorService executorService;
    private ScheduledExecutorService scheduledExecutorService;

    /**
     * Create a new custom-configured {@link JerseyClient} instance.
     *
     * @return new configured Jersey client instance.
     * @since 2.5
     */
    public static JerseyClient createClient() {
        return new JerseyClientBuilder().build();
    }

    /**
     * Create a new custom-configured {@link JerseyClient} instance.
     *
     * @param configuration data used to provide initial configuration for the new
     *                      Jersey client instance.
     * @return new configured Jersey client instance.
     * @since 2.5
     */
    public static JerseyClient createClient(Configuration configuration) {
        return new JerseyClientBuilder().withConfig(configuration).build();
    }

    /**
     * Create new Jersey client builder instance.
     */
    public JerseyClientBuilder() {
        this.config = new ClientConfig();
    }

    @Override
    public JerseyClientBuilder sslContext(SSLContext sslContext) {
        if (sslContext == null) {
            throw new NullPointerException(LocalizationMessages.NULL_SSL_CONTEXT());
        }
        this.sslContext = sslContext;
        sslConfigurator = null;
        return this;
    }

    @Override
    public JerseyClientBuilder keyStore(KeyStore keyStore, char[] password) {
        if (keyStore == null) {
            throw new NullPointerException(LocalizationMessages.NULL_KEYSTORE());
        }
        if (password == null) {
            throw new NullPointerException(LocalizationMessages.NULL_KEYSTORE_PASWORD());
        }
        if (sslConfigurator == null) {
            sslConfigurator = SslConfigurator.newInstance();
        }
        sslConfigurator.keyStore(keyStore);
        sslConfigurator.keyPassword(password);
        sslContext = null;
        return this;
    }

    @Override
    public JerseyClientBuilder trustStore(KeyStore trustStore) {
        if (trustStore == null) {
            throw new NullPointerException(LocalizationMessages.NULL_TRUSTSTORE());
        }
        if (sslConfigurator == null) {
            sslConfigurator = SslConfigurator.newInstance();
        }
        sslConfigurator.trustStore(trustStore);
        sslContext = null;
        return this;
    }

    @Override
    public JerseyClientBuilder hostnameVerifier(HostnameVerifier hostnameVerifier) {
        this.hostnameVerifier = hostnameVerifier;
        return this;
    }

    @Override
    public ClientBuilder executorService(ExecutorService executorService) {
        this.executorService = executorService;
        return this;
    }

    @Override
    public ClientBuilder scheduledExecutorService(ScheduledExecutorService scheduledExecutorService) {
        this.scheduledExecutorService = scheduledExecutorService;
        return this;
    }

    @Override
    public ClientBuilder connectTimeout(long timeout, TimeUnit unit) {
        if (timeout < 0) {
            throw new IllegalArgumentException("Negative timeout.");
        }

        this.property(ClientProperties.CONNECT_TIMEOUT, Math.toIntExact(unit.toMillis(timeout)));
        return this;
    }

    @Override
    public ClientBuilder readTimeout(long timeout, TimeUnit unit) {
        if (timeout < 0) {
            throw new IllegalArgumentException("Negative timeout.");
        }

        this.property(ClientProperties.READ_TIMEOUT, Math.toIntExact(unit.toMillis(timeout)));
        return this;
    }

    @Override
    public JerseyClient build() {
        if (sslContext != null) {
            return new JerseyClient(config, sslContext, hostnameVerifier, null, executorService,
                                    scheduledExecutorService);
        } else if (sslConfigurator != null) {
            final SslConfigurator sslConfiguratorCopy = sslConfigurator.copy();
            return new JerseyClient(
                    config,
                    Values.lazy(new UnsafeValue<SSLContext, IllegalStateException>() {
                        @Override
                        public SSLContext get() {
                            return sslConfiguratorCopy.createSSLContext();
                        }
                    }),
                    hostnameVerifier, executorService, scheduledExecutorService);
        } else {
            return new JerseyClient(config, (UnsafeValue<SSLContext, IllegalStateException>) null, hostnameVerifier,
                                    executorService, scheduledExecutorService);
        }
    }

    @Override
    public ClientConfig getConfiguration() {
        return config;
    }

    @Override
    public JerseyClientBuilder property(String name, Object value) {
        this.config.property(name, value);
        return this;
    }

    @Override
    public JerseyClientBuilder register(Class<?> componentClass) {
        this.config.register(componentClass);
        return this;
    }

    @Override
    public JerseyClientBuilder register(Class<?> componentClass, int priority) {
        this.config.register(componentClass, priority);
        return this;
    }

    @Override
    public JerseyClientBuilder register(Class<?> componentClass, Class<?>... contracts) {
        this.config.register(componentClass, contracts);
        return this;
    }

    @Override
    public JerseyClientBuilder register(Class<?> componentClass, Map<Class<?>, Integer> contracts) {
        this.config.register(componentClass, contracts);
        return this;
    }

    @Override
    public JerseyClientBuilder register(Object component) {
        this.config.register(component);
        return this;
    }

    @Override
    public JerseyClientBuilder register(Object component, int priority) {
        this.config.register(component, priority);
        return this;
    }

    @Override
    public JerseyClientBuilder register(Object component, Class<?>... contracts) {
        this.config.register(component, contracts);
        return this;
    }

    @Override
    public JerseyClientBuilder register(Object component, Map<Class<?>, Integer> contracts) {
        this.config.register(component, contracts);
        return this;
    }

    @Override
    public JerseyClientBuilder withConfig(Configuration config) {
        this.config.loadFrom(config);
        return this;
    }
}
