/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH (http://www.alkacon.com)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* For further information about Alkacon Software GmbH, please see the
* company website: http://www.alkacon.com
*
* For further information about OpenCms, please see the
* project website: http://www.opencms.org
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.opencms.util;
/**
* Describes a macro mapper, which is used to efficiently resolve macros
* in the form of <code>%(key)</code> or <code>${key}</code> in an input String.<p>
*
* Starting with OpenCms 7.0, the preferred form of a macro is <code>%(key)</code>. This is to
* avoid conflicts / confusion with the JSP EL, which also uses the <code>${key}</code> syntax.<p>
*
* The macro replacement is pre-implemented in
* <code>{@link org.opencms.util.CmsMacroResolver#resolveMacros(String, I_CmsMacroResolver)}</code>.<p>
*
* @since 6.0.0
*/
public interface I_CmsMacroResolver {
/** Delimiter char <code>'%'</code> for a macro - new / current style. */
char MACRO_DELIMITER = '%';
/** Delimiter char <code>'$'</code> for a macro - old style. */
char MACRO_DELIMITER_OLD = '$';
/** End char <code>')'</code> for a macro - new / current style. */
char MACRO_END = ')';
/** End char <code>'}'</code> for a macro - old style. */
char MACRO_END_OLD = '}';
/** Start char <code>'('</code> for a macro - new / current style. */
char MACRO_START = '(';
/** Start char <code>'{'</code> for a macro - old style. */
char MACRO_START_OLD = '{';
/**
* Resolves a single macro to the macro value, returns <code>null</code> if the macro could not be resolved.<p>
*
* @param macro the macro to resolve
* @return the resolved macro or <code>null</code> if the macro could not be resolved
*/
String getMacroValue(String macro);
/**
* Returns <code>true</code> if macros that could not be resolved are kept "as is" in the
* input String, <code>false</code> if they are replaced by an empty String.<p>
*
* @return <code>true</code> if macros that could not be resolved are kept "as is" in the
* input String, <code>false</code> if they are replaced by an empty String
*/
boolean isKeepEmptyMacros();
/**
* Resolves all macros in the input, replacing them with the macro values.<p>
*
* The flag {@link #isKeepEmptyMacros()} controls how to deal with
* macros found in the input that can not be resolved.
*
* @param input the input to resolve the macros in
*
* @return the input with all macros resolved
*/
String resolveMacros(String input);
}