com.jaregu.database.queries.compiling.OptionalHyphenNamedParameterFeature Maven / Gradle / Ivy

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Java based SQL templating project. Store your queries in *.sql files and build queries for execution. Supports simple expressions and conditional clauses and interface proxying for java-sql bridge.

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package com.jaregu.database.queries.compiling;

import java.util.Arrays;
import java.util.List;
import java.util.function.Function;

import com.jaregu.database.queries.building.ParameterBinder;
import com.jaregu.database.queries.compiling.expr.ExpressionParser;
import com.jaregu.database.queries.parsing.ParsedQueryPart;

/**
 * Matches parameter line
 * 
 * Example:
 * 
 * 
 * ...
 *  AND t.SOME_FIELD = 123 -- value_expression[; conditional_expression]
 * ...
 * 
 * 
 * Expression is something for what
 * {@link ExpressionParser#isLikeExpression(String)} is true
 * 
 * 
 * value_expression will be value for binded SQL parameter
 * 
 * conditional_expression is testable condition when this row will be
 * added to SQL, default condition is conditional_expression != null
 */
final class OptionalHyphenNamedParameterFeature extends OptionalNamedParameterFeatureBase {

	private final List> _const_comment_ = Arrays.asList(isSqlWithoutNewLine,
			isHyphenCommentExpression);
	private final List> _question_comment_ = Arrays.asList(isAnonymousVariable,
			isHyphenCommentExpression);
	private final List> _question_sql_comment_ = Arrays.asList(isAnonymousVariable,
			isSqlWithoutNewLine, isHyphenCommentExpression);
	private final List> _sql_question_comment_ = Arrays.asList(isSqlWithoutNewLine,
			isAnonymousVariable, isHyphenCommentExpression);
	private final List> _sql_question_sql_comment_ = Arrays
			.asList(isSqlWithoutNewLine, isAnonymousVariable, isSqlWithoutNewLine, isHyphenCommentExpression);

	OptionalHyphenNamedParameterFeature(ExpressionParser expressionParser, ParameterBinder parameterBinder) {
		super(expressionParser, parameterBinder);
	}

	@Override
	public boolean isCompilable(Source source) {
		return isPartsLike(source, _const_comment_) || isPartsLike(source, _question_comment_)
				|| isPartsLike(source, _question_sql_comment_) || isPartsLike(source, _sql_question_comment_)
				|| isPartsLike(source, _sql_question_sql_comment_);
	}

	@Override
	public Result compile(Source source, Compiler compiler) {
		Builder builder;
		if (isPartsLike(source, _const_comment_)) {
			builder = new Builder(source).before(0, true).after(1).comment(1);
		} else if (isPartsLike(source, _question_comment_)) {
			builder = new Builder(source).after(1).comment(1);
		} else if (isPartsLike(source, _question_sql_comment_)) {
			builder = new Builder(source).after(1, 2).comment(2);
		} else if (isPartsLike(source, _sql_question_comment_)) {
			builder = new Builder(source).before(0).after(2).comment(2);
		} else if (isPartsLike(source, _sql_question_sql_comment_)) {
			builder = new Builder(source).before(0).after(2, 3).comment(3);
		} else {
			throw new QueryCompileException("Wrong parts count!");
		}
		return builder.build();
	}
}