io.dropwizard.jdbi3.NamePrependingTemplateEngine Maven / Gradle / Ivy

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package io.dropwizard.jdbi3;

import org.jdbi.v3.core.extension.ExtensionMethod;
import org.jdbi.v3.core.statement.StatementContext;
import org.jdbi.v3.core.statement.TemplateEngine;

import java.util.Objects;

/**
 * Jdbi {@link TemplateEngine} that prepends the SQLObject's type and method name in front of every
 * statement sent to the database.
 */
public class NamePrependingTemplateEngine implements TemplateEngine {
    private final TemplateEngine originalEngine;

    /**
     * @param originalEngine    The original {@link TemplateEngine} to use to create the actual statements
     */
    public NamePrependingTemplateEngine(TemplateEngine originalEngine) {
        this.originalEngine = Objects.requireNonNull(originalEngine, "'originalEngine' cannot be null'");
    }

    @Override
    public String render(String template, StatementContext ctx) {
        final ExtensionMethod extensionMethod = ctx.getExtensionMethod();
        final String originalResult = originalEngine.render(template, ctx);

        if (extensionMethod == null) {
            return originalResult;
        }

        final StringBuilder query = new StringBuilder(originalResult.length() + 100);
        query.append("/* ");
        final String className = extensionMethod.getType().getSimpleName();
        if (!className.isEmpty()) {
            query.append(className).append('.');
        }
        query.append(extensionMethod.getMethod().getName());
        query.append(" */ ");
        query.append(originalResult);

        return query.toString();
    }
}