logicalexpression.java

一个Java持久层类库

//$Id: LogicalExpression.java 5685 2005-02-12 07:19:50Z steveebersole $
package org.hibernate.criterion;


import org.hibernate.Criteria;
import org.hibernate.HibernateException;
import org.hibernate.engine.TypedValue;

/**
 * Superclass of binary logical expressions
 * @author Gavin King
 */
public class LogicalExpression implements Criterion {

	private final Criterion lhs;
	private final Criterion rhs;
	private final String op;

	protected LogicalExpression(Criterion lhs, Criterion rhs, String op) {
		this.lhs = lhs;
		this.rhs = rhs;
		this.op = op;
	}

	public TypedValue[] getTypedValues(Criteria criteria, CriteriaQuery criteriaQuery)
	throws HibernateException {

		TypedValue[] lhstv = lhs.getTypedValues(criteria, criteriaQuery);
		TypedValue[] rhstv = rhs.getTypedValues(criteria, criteriaQuery);
		TypedValue[] result = new TypedValue[ lhstv.length + rhstv.length ];
		System.arraycopy(lhstv, 0, result, 0, lhstv.length);
		System.arraycopy(rhstv, 0, result, lhstv.length, rhstv.length);
		return result;
	}

	public String toSqlString(Criteria criteria, CriteriaQuery criteriaQuery)
	throws HibernateException {

		return '(' +
			lhs.toSqlString(criteria, criteriaQuery) +
			' ' +
			getOp() +
			' ' +
			rhs.toSqlString(criteria, criteriaQuery) +
			')';
	}

	public String getOp() {
		return op;
	}

	public String toString() {
		return lhs.toString() + ' ' + getOp() + ' ' + rhs.toString();
	}
}