1 /*******************************************************************************
2  * Copyright (c) 2009 - 2010 Cloudsmith Inc. and others.
3  *
4  * This program and the accompanying materials
5  * are made available under the terms of the Eclipse Public License 2.0
6  * which accompanies this distribution, and is available at
7  * https://www.eclipse.org/legal/epl-2.0/
8  *
9  * SPDX-License-Identifier: EPL-2.0
10  *
11  * Contributors:
12  *     Cloudsmith Inc. - initial API and implementation
13  *******************************************************************************/
14 package org.eclipse.equinox.p2.metadata.expression;
15 
16 /**
17  * A parser that produces an expression tree based on a string representation. An
18  * implementation will use the {@link IExpressionFactory} to create the actual expressions
19  * @since 2.0
20  */
21 public interface IExpressionParser {
22 	/**
23 	 * Create a new expression. The expression will have access to the global
24 	 * variable 'this' and to the context parameters.
25 	 * @param exprString The string representing the boolean expression.
26 	 * @return The resulting expression tree.
27 	 * @throws ExpressionParseException If an error occurred during parsing.
28 	 */
parse(String exprString)29 	IExpression parse(String exprString);
30 
31 	/**
32 	 * Create an arbitrary expression. The expression will have access to the global
33 	 * variable 'everything' and to the context parameters.
34 	 * @param exprString The string representing the boolean expression.
35 	 * @return The resulting expression tree.
36 	 * @throws ExpressionParseException If an error occurred during parsing.
37 	 */
parseQuery(String exprString)38 	IExpression parseQuery(String exprString);
39 }
40