org.pentaho.cdf.context.autoinclude.DashboardMatchRule.java Source code

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Here is the source code for org.pentaho.cdf.context.autoinclude.DashboardMatchRule.java

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/*!
 * Copyright 2002 - 2015 Webdetails, a Pentaho company. All rights reserved.
 *
 * This software was developed by Webdetails and is provided under the terms
 * of the Mozilla Public License, Version 2.0, or any later version. You may not use
 * this file except in compliance with the license. If you need a copy of the license,
 * please go to http://mozilla.org/MPL/2.0/. The Initial Developer is Webdetails.
 *
 * Software distributed under the Mozilla Public License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. Please refer to
 * the license for the specific language governing your rights and limitations.
 */

package org.pentaho.cdf.context.autoinclude;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.dom4j.Node;

/**
 * Determines if a matched cda should be applied to a dashboard.<br>
 * One will be generated for each matched cda file and every dashboard-matching rule.
 */
class DashboardMatchRule {

    private static Pattern REPLACE_TOKEN = Pattern.compile("\\$([0-9]+)");
    private static final Log log = LogFactory.getLog(DashboardMatchRule.class);

    public enum Mode {
        INCLUDE, EXCLUDE
    }

    private Pattern regex;
    private Mode mode;

    /**
     * 
     * @param cdaMatcher matcher for a cda file recognized by the cda regex
     * @param ruleNode &lt;include&gt; or &lt;exclude&gt; node
     */
    public DashboardMatchRule(Matcher cdaMatcher, Node ruleNode) {
        this.mode = parseMode(ruleNode.getName());
        this.regex = replaceTokens(cdaMatcher, ruleNode.getText());
    }

    /**
     * 
     * @param dashboardPath full dashboard path for comparison (file name inc.)
     * @param result current inclusion status for dashboard
     * @return if dashboard should be included (assuming no more rules)
     */
    public boolean canInclude(String dashboardPath, boolean result) {
        switch (mode) {
        case EXCLUDE:
            if (!result) {
                return false;
            }
            return !regex.matcher(dashboardPath).matches();
        case INCLUDE:
            if (result) {
                return true;
            }
            return regex.matcher(dashboardPath).matches();
        default:
            // should never happen
            throw new IllegalStateException("Invalid rule!");
        }
    }

    private static Mode parseMode(String nodeName) {
        if (nodeName.equals("include")) {
            return Mode.INCLUDE;
        } else if (nodeName.equals("exclude")) {
            return Mode.EXCLUDE;
        } else {
            throw new IllegalArgumentException("Inclusion rule mode " + nodeName + " not supported.");
        }
    }

    private Pattern replaceTokens(Matcher cdaMatcher, String regex) {
        // replace $1 for group 1 in regex etc
        Matcher token = REPLACE_TOKEN.matcher(regex);
        StringBuffer sb = new StringBuffer();
        while (token.find()) {
            int group = Integer.parseInt(token.group(1));
            if (group < cdaMatcher.groupCount()) {
                token.appendReplacement(sb, Matcher.quoteReplacement(Pattern.quote(cdaMatcher.group(group))));
            } else {
                log.error(String.format("Error processing rule '%s', group %d does not exist.", regex, group));
            }
        }
        token.appendTail(sb);
        return Pattern.compile(sb.toString());
    }

    @Override
    public String toString() {
        return mode + "(" + regex + ")";
    }

}