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/*
 * Copyright 2002-2017 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.expression;

/**
 * Input provided to an expression parser that can influence an expression
 * parsing/compilation routine.
 *
 * @author Keith Donald
 * @author Andy Clement
 * @since 3.0
 */
public interface ParserContext {

	/**
	 * Whether or not the expression being parsed is a template. A template expression
	 * consists of literal text that can be mixed with evaluatable blocks. Some examples:
	 * 
	 * 	   Some literal text
	 *     Hello #{name.firstName}!
	 *     #{3 + 4}
	 * 
* @return true if the expression is a template, false otherwise */ boolean isTemplate(); /** * For template expressions, returns the prefix that identifies the start of an * expression block within a string. For example: "${" * @return the prefix that identifies the start of an expression */ String getExpressionPrefix(); /** * For template expressions, return the prefix that identifies the end of an * expression block within a string. For example: "}" * @return the suffix that identifies the end of an expression */ String getExpressionSuffix(); /** * The default ParserContext implementation that enables template expression * parsing mode. The expression prefix is "#{" and the expression suffix is "}". * @see #isTemplate() */ ParserContext TEMPLATE_EXPRESSION = new ParserContext() { @Override public boolean isTemplate() { return true; } @Override public String getExpressionPrefix() { return "#{"; } @Override public String getExpressionSuffix() { return "}"; } }; }




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