api.DatabaseConnection Maven / Gradle / Ivy

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package api;

import java.util.Objects;

/**
 * Connects to a database
 * @param  The type of the schema the database has to fulfill.
 *           For an SQL database S should be an instance of SQLSchema.
 */
public interface DatabaseConnection {
    class Value{
        private final String value;

        public Value(String value) {
            assert value != null;
            this.value = value;
        }

        public String get(){
            return value;
        }

        @Override
        public boolean equals(Object o) {
            if (this == o) return true;
            if (o == null || getClass() != o.getClass()) return false;
            Value value1 = (Value) o;
            return value.equals(value1.value);
        }

        @Override
        public int hashCode() {
            return Objects.hash(value);
        }

        @Override
        public String toString() {
            return "Value{" +
                    "value='" + value + '\'' +
                    '}';
        }
    }

    /**
     * Builds up the database according to the given schema.
     * Data will be deleted, if it conflicts with the schema.
     * @param schema The schema the database shall meet
     * @param moreSchemas (Optional) additional schemas the database shall meet
     */
    void init(S schema, S... moreSchemas);
}