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    • org.joo.libra.sql.SqlPredicate Maven / Gradle / Ivy

    package org.joo.libra.sql;

import org.joo.libra.LiteralPredicate;
import org.joo.libra.Predicate;
import org.joo.libra.PredicateContext;
import org.joo.libra.common.CompositionPredicate;
import org.joo.libra.support.exceptions.MalformedSyntaxException;
import org.joo.libra.support.exceptions.PredicateExecutionException;

import lombok.Getter;
import lombok.NonNull;

/**
 * Represents a SQL-syntax predicate. It will parse the given string using a
 * specified grammar.
 * 
 * @author griever
 *
 */
public class SqlPredicate implements CompositionPredicate, LiteralPredicate {

	private boolean error;

	private @Getter MalformedSyntaxException cause;

	private @Getter SqlPredicateParser parser;

	private Predicate predicate;

	public SqlPredicate(final String predicate) {
		this(predicate, new AntlrSqlPredicateParser());
	}

	public SqlPredicate(final String predicate, final @NonNull SqlPredicateParser parser) {
		try {
			this.parser = parser;
			this.predicate = parser.parse(predicate);
			if (this.predicate == null) {
				error = true;
				cause = new MalformedSyntaxException("Predicate cannot be parsed");
			}
		} catch (MalformedSyntaxException ex) {
			error = true;
			cause = ex;
		} catch (Exception ex) {
			error = true;
			cause = new MalformedSyntaxException(ex);
		}
	}

	@Override
	public Object calculateLiteralValue(final PredicateContext context) throws PredicateExecutionException {
		if (predicate != null && predicate instanceof LiteralPredicate)
			return ((LiteralPredicate) predicate).calculateLiteralValue(context);
		return satisfiedBy(context);
	}

	@Override
	public boolean satisfiedBy(final PredicateContext context) throws PredicateExecutionException {
		if (error || predicate == null)
			return false;
		try {
			return predicate.satisfiedBy(context);
		} catch (Exception ex) {
			throw new PredicateExecutionException("Exception while executing SQL predicate", ex);
		}
	}

	/**
	 * Check if there is any error while parsing the SQL and throw it.
	 */
	public void checkForErrorAndThrow() {
		if (error)
			throw cause;
	}

	/**
	 * Check if there is any error while parsing the SQL.
	 * 
	 * @return true if and only if any error occurred while parsing the SQL.
	 */
	public boolean hasError() {
		return error;
	}

	public String toString() {
		if (error)
			return "#ERROR#";
		return predicate.toString();
	}
}    
    
    
    

    




    
    
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