expressionfactory.java

来自「OpenJMS是一个开源的Java Message Service API 1.」· Java 代码 · 共 150 行

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package org.exolab.jms.selector;

import java.util.HashSet;


/**
 * This interface specifies the methods needed to create all of the
 * expressions supported by the message selector. It exists solely to
 * decouple the expression evaluation classes from the parser.
 *
 * @version     $Revision: 1.1 $ $Date: 2004/11/26 01:50:44 $
 * @author      <a href="mailto:[e-mail]">Tim Anderson</a>
 * @see         Expression
 * @see         org.exolab.jms.selector.parser.SelectorTokenTypes
 * @see         org.exolab.jms.selector.parser.SelectorTreeParser
 */
public interface ExpressionFactory {

    /**
     * Create a binary operator expression
     *
     * @param operator the operator token type from SelectorTokenTypes
     * @param left the left-hand side of the binary expression
     * @param right the right-hand side of the binary expression
     * @return a new binary expression
     * @throws SelectorException if the operator is not a valid binary operator
     */
    Expression binaryOperator(int operator, Expression left, Expression right)
        throws SelectorException;

    /**
     * Create an unary operator expression
     *
     * @param operator the operator token type from SelectorTokenTypes
     * @param operand the expression to apply the operator to
     * @return a new unary expression
     * @throws SelectorException if the operator is not a valid unary operator
     */
    Expression unaryOperator(int operator, Expression operand)
        throws SelectorException;

    /**
     * Create an identifier expression
     *
     * @param name the name of the identifier
     * @return a new identifier expression
     * @throws SelectorException is name is not a valid identifier
     */
    Expression identifier(String name) throws SelectorException;

    /**
     * Create an 'is null' expression
     *
     * @param identifier the identifer expression to apply the 'is null' test
     * @return an 'is null' expression
     * @throws SelectorException for any error
     */
    Expression isNull(Expression identifier) throws SelectorException;

    /**
     * Create a 'like' expression
     *
     * @param identifier the identifer to apply the 'like' test to
     * @param pattern the search pattern
     * @param escape the escape character. This may be null
     * @return a new 'like' expression
     * @throws SelectorException if the pattern or escape is invalid
     */
    Expression like(Expression identifier, String pattern, String escape)
        throws SelectorException;

    /**
     * Create a 'between' expression that returns the result of:<br/>
     * <code>num1 >= num2 and num1 <= num3</code>
     * when evaluated
     *
     * @param num1 an arithmethic expression
     * @param num2 an arithmethic expression
     * @param num3 an arithmethic expression
     * @return a new 'between' expression
     * @throws SelectorException for any error
     */
    Expression between(Expression num1, Expression num2, Expression num3)
        throws SelectorException;

    /**
     * Create an 'in' expression
     *
     * @param identifier string identifer to apply the 'in' test to
     * @param set the set of string values to compare against
     * @return a new 'in' expression
     * @throws SelectorException for any error
     */
    Expression in(Expression identifier, HashSet set) throws SelectorException;

    /**
     * Create a literal expression
     *
     * @param type the operator token type from SelectorTokenTypes
     * @param text the literal text
     * @return a new literal expression
     * @throws SelectorException if type is not a valid literal type
     */
    Expression literal(int type, String text) throws SelectorException;

} //-- ExpressionFactory