cmsmacroresolver.java

cms是开源的框架

/*
 * File   : $Source: /usr/local/cvs/opencms/src/org/opencms/util/CmsMacroResolver.java,v $
 * Date   : $Date: 2006/03/27 14:52:41 $
 * Version: $Revision: 1.18 $
 *
 * This library is part of OpenCms -
 * the Open Source Content Mananagement System
 *
 * Copyright (c) 2005 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;

import org.opencms.file.CmsObject;
import org.opencms.file.CmsProperty;
import org.opencms.file.CmsResource;
import org.opencms.flex.CmsFlexController;
import org.opencms.i18n.CmsMessageContainer;
import org.opencms.i18n.CmsMessages;
import org.opencms.main.CmsException;
import org.opencms.main.CmsLog;
import org.opencms.main.OpenCms;

import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.jsp.PageContext;

import org.apache.commons.logging.Log;

/**
 * Resolves macros in the form of <code>${key}</code> in an input String.<p>
 * 
 * The macro names that can be resolved depend of the context objects provided to the resolver
 * using the <code>set...</code> methods.<p>
 * 
 * @author Alexander Kandzior 
 * @author Thomas Weckert  
 * 
 * @version $Revision: 1.18 $ 
 * 
 * @since 6.0.0 
 */
public class CmsMacroResolver implements I_CmsMacroResolver {

    /** Key used to specify the current time as macro value. */
    public static final String KEY_CURRENT_TIME = "currenttime";

    /** Key used to specify the city of the current user as macro value. */
    public static final String KEY_CURRENT_USER_CITY = "currentuser.city";

    /** Key used to specify the email address of the current user as macro value. */
    public static final String KEY_CURRENT_USER_EMAIL = "currentuser.email";

    /** Key used to specify the first name of the current user as macro value. */
    public static final String KEY_CURRENT_USER_FIRSTNAME = "currentuser.firstname";

    /** Key used to specify the full name of the current user as macro value. */
    public static final String KEY_CURRENT_USER_FULLNAME = "currentuser.fullname";

    /** Key used to specify the last name of the current user as macro value. */
    public static final String KEY_CURRENT_USER_LASTNAME = "currentuser.lastname";

    /** Key used to specify the username of the current user as macro value. */
    public static final String KEY_CURRENT_USER_NAME = "currentuser.name";

    /** Key used to specify the street of the current user as macro value. */
    public static final String KEY_CURRENT_USER_STREET = "currentuser.street";

    /** Key used to specify the zip code of the current user as macro value. */
    public static final String KEY_CURRENT_USER_ZIP = "currentuser.zip";

    /** Key used to specify the country of the current user as macro value. */
    public static final String KEY_CURRENT_USER_COUNTRY = "currentuser.country";

    /** Key prefix used to specify the value of a localized key as macro value. */
    public static final String KEY_LOCALIZED_PREFIX = "key.";

    /** Identifier for "magic" parameter names. */
    public static final String KEY_OPENCMS = "opencms.";

    /** The prefix indicating that the key represents a page context object. */
    public static final String KEY_PAGE_CONTEXT = "pageContext.";

    /** The prefix indicating that the key represents a Cms property to be read on the current request URI. */
    public static final String KEY_PROPERTY = "property.";

    /** The prefix indicating that the key represents a Cms property to be read on the current element. */
    public static final String KEY_PROPERTY_ELEMENT = "elementProperty.";

    /** Key used to specify the request encoding as macro value. */
    public static final String KEY_REQUEST_ENCODING = "request.encoding";

    /** Key used to specify the folder of the request uri as macro value. */
    public static final String KEY_REQUEST_FOLDER = "request.folder";

    /** Key user to specify the request locale as macro value. */
    public static final String KEY_REQUEST_LOCALE = "request.locale";

    /** The prefix indicating that the key represents a Http request parameter. */
    public static final String KEY_REQUEST_PARAM = "param.";

    /** Key used to specify the request uri as macro value. */
    public static final String KEY_REQUEST_URI = "request.uri";

    /** Key used to specify the validation path as macro value. */
    public static final String KEY_VALIDATION_PATH = "validation.path";

    /** Key used to specify the validation regex as macro value. */
    public static final String KEY_VALIDATION_REGEX = "validation.regex";

    /** Key used to specifiy the validation value as macro value. */
    public static final String KEY_VALIDATION_VALUE = "validation.value";

    /** Identified for "magic" parameter commands. */
    public static final String[] VALUE_NAME_ARRAY = {"uri", "filename", "folder", "default.encoding"};

    /** The "magic" commands wrapped in a List. */
    public static final List VALUE_NAMES = Collections.unmodifiableList(Arrays.asList(VALUE_NAME_ARRAY));

    /** The log object for this class. */
    private static final Log LOG = CmsLog.getLog(CmsMacroResolver.class);

    /** A map of additional values provided by the calling class. */
    protected Map m_additionalMacros;

    /** The OpenCms user context to use for resolving macros. */
    protected CmsObject m_cms;

    /** The JSP's page context to use for resolving macros. */
    protected PageContext m_jspPageContext;

    /** Indicates if unresolved macros should be kept "as is" or replaced by an empty String. */
    protected boolean m_keepEmptyMacros;

    /** The messages resource bundle to resolve localized keys with. */
    protected CmsMessages m_messages;

    /** The resource name to use for resolving macros. */
    protected String m_resourceName;

    /**
     * Adds macro delimiters to the given input, 
     * for example <code>key</code> becomes <code>${key}</code>.<p>
     * 
     * @param input the input to format as a macro
     * 
     * @return the input formatted as a macro
     */
    public static String formatMacro(String input) {

        StringBuffer result = new StringBuffer(input.length() + 4);
        result.append(I_CmsMacroResolver.MACRO_DELIMITER);
        result.append(I_CmsMacroResolver.MACRO_START);
        result.append(input);
        result.append(I_CmsMacroResolver.MACRO_END);
        return result.toString();
    }

    /**
     * Returns <code>true</code> if the given input String if formatted like a macro,
     * that is it starts with <code>{@link I_CmsMacroResolver#MACRO_DELIMITER} +
     * {@link I_CmsMacroResolver#MACRO_START}</code> and ends with 
     * <code>{@link I_CmsMacroResolver#MACRO_END}</code>.<p>
     * 
     * @param input the input to check for a macro
     * @return <code>true</code> if the given input String if formatted like a macro
     */
    public static boolean isMacro(String input) {

        if (CmsStringUtil.isEmpty(input) || (input.length() < 3)) {
            return false;
        }

        return ((input.charAt(0) == I_CmsMacroResolver.MACRO_DELIMITER)
            && (input.charAt(1) == I_CmsMacroResolver.MACRO_START) && (input.charAt(input.length() - 1) == I_CmsMacroResolver.MACRO_END));
    }

    /**
     * Factory method to create a new {@link CmsMacroResolver} instance.<p>
     * 
     * @return a new instance of a {@link CmsMacroResolver}
     */
    public static CmsMacroResolver newInstance() {

        return new CmsMacroResolver();
    }

    /**
     * Resolves the macros in the given input using the provided parameters.<p>
     * 
     * A macro in the form <code>${key}</code> in the content is replaced with it's assigned value
     * returned by the <code>{@link I_CmsMacroResolver#getMacroValue(String)}</code> method of the given 
     * <code>{@link I_CmsMacroResolver}</code> instance.<p>
     * 
     * If a macro is found that can not be mapped to a value by the given macro resolver,
     * it is left untouched in the input.<p>
     * 
     * @param input the input in which to resolve the macros
     * @param cms the OpenCms user context to use when resolving macros
     * @param messages the message resource bundle to use when resolving macros
     * 
     * @return the input with the macros resolved
     */
    public static String resolveMacros(String input, CmsObject cms, CmsMessages messages) {

        CmsMacroResolver resolver = new CmsMacroResolver();
        resolver.m_cms = cms;
        resolver.m_messages = messages;
        resolver.m_keepEmptyMacros = true;
        return resolver.resolveMacros(input);
    }

    /**
     * Resolves macros in the provided input String using the given macro resolver.<p>
     * 
     * A macro in the form <code>${key}</code> in the content is replaced with it's assigned value
     * returned by the <code>{@link I_CmsMacroResolver#getMacroValue(String)}</code> method of the given 
     * <code>{@link I_CmsMacroResolver}</code> instance.<p>
     * 
     * If a macro is found that can not be mapped to a value by the given macro resolver,
     * <code>{@link I_CmsMacroResolver#isKeepEmptyMacros()}</code> controls if the macro is replaced by
     * an empty String, or is left untoched in the input.<p>
     * 
     * @param input the input in which to resolve the macros
     * @param resolver the macro resolver to use
     * 
     * @return the input with all macros resolved
     */
    public static String resolveMacros(final String input, I_CmsMacroResolver resolver) {

        if ((input == null) || (input.length() < 3)) {
            // macro must have at last 3 chars "${}"
            return input;
        }

        int p = input.indexOf(I_CmsMacroResolver.MACRO_DELIMITER);
        if (p == -1) {
            // no macro delimiter found in input
            return input;
        }

        int len = input.length();
        StringBuffer result = new StringBuffer(len << 1);
        int np, pp1, pp2, e;
        String macro, value;
        boolean keep = resolver.isKeepEmptyMacros();
        boolean resolvedNone = true;

        // append chars before the first delimiter found
        result.append(input.substring(0, p));
        do {
            pp1 = p + 1;
            pp2 = pp1 + 1;
            if (pp2 >= len) {
                // remaining chars cant be a macro (minumum size is 3)
                result.append(input.substring(p, len));
                break;
            }
            // get the next macro delimiter
            np = input.indexOf(I_CmsMacroResolver.MACRO_DELIMITER, pp1);
            if (np == -1) {
                // none found, make sure remaining chars in this segement are appended
                np = len;
            }
            // check if the next char is a "macro start"
            if (input.charAt(pp1) == I_CmsMacroResolver.MACRO_START) {
                // we have a starting macro sequence "${", now check if this segment contains a "}"
                e = input.indexOf(I_CmsMacroResolver.MACRO_END, p);
                if ((e > 0) && (e < np)) {
                    // this segment contains a closing macro delimiter "}", so we have found a macro
                    macro = input.substring(pp2, e);
                    // resolve macro
                    value = resolver.getMacroValue(macro);
                    e++;
                    if (value != null) {
                        // macro was successfully resolved
                        result.append(value);
                        resolvedNone = false;
                    } else if (keep) {
                        // macro was unknown, but should be kept
                        result.append(input.substring(p, e));
                    }
                } else {
                    // no complete macro "${...}" in this segment
                    e = p;
                }
            } else {
                // no macro start char after the "$"
                e = p;
            }
            // append the remaining chars after the macro to the start of the next macro
            result.append(input.substring(e, np));
            // this is a nerdy joke ;-)
            p = np;
        } while (p < len);

        if (resolvedNone && keep) {
            // nothing was resolved and macros should be kept, return original input
            return input;
        }

        // input was changed during resolving of macros