com.anrisoftware.sscontrol.httpd.nginx.nginxconfig.NginxConfigList Maven / Gradle / Ivy

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/*
 * Copyright 2013-2015 Erwin Müller 
 *
 * This file is part of sscontrol-httpd-nginx.
 *
 * sscontrol-httpd-nginx is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Affero General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 *
 * sscontrol-httpd-nginx 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 Affero General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with sscontrol-httpd-nginx. If not, see .
 */
package com.anrisoftware.sscontrol.httpd.nginx.nginxconfig;

import static org.apache.commons.lang3.StringUtils.splitByWholeSeparatorPreserveAllTokens;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.lang3.StringUtils;

/**
 * Accumulate directives for locations with the same name.
 *
 * @author Erwin Mueller, [email protected]
 * @since 1.0
 */
@SuppressWarnings("serial")
public class NginxConfigList extends ArrayList {

    static final Pattern LOCATION_SECTION_PATTERN = Pattern
            .compile("(?m)^location (.*) \\{$");

    private final String newLine;

    /**
     * @see NginxConfigListFactory#create()
     */
    NginxConfigList() {
        this.newLine = System.getProperty("line.separator");
    }

    @Override
    public boolean add(String string) {
        LocationEntry entry = createLocationEntry(string, -1);
        if (entry != null) {
            LocationEntry thisentry = findLocationEntry(this, entry.getName());
            if (thisentry != null) {
                entry = insertLocation(entry, thisentry);
                super.set(entry.getIndex(), entry.getString());
                return false;
            }
        }
        return super.add(string);
    }

    private LocationEntry findLocationEntry(List list, String name) {
        for (int i = 0; i < size(); i++) {
            LocationEntry entry = createLocationEntry(get(i), i);
            if (entry != null && entry.getName().equals(name)) {
                return entry;
            }
        }
        return null;
    }

    private LocationEntry insertLocation(LocationEntry entry,
            LocationEntry thisentry) {
        thisentry.getBody();
        return thisentry.insertBody(entry.getBody(),
                thisentry.getLocationBodyEnd());
    }

    private LocationEntry createLocationEntry(String string, int index) {
        String[] lines = splitByWholeSeparatorPreserveAllTokens(string, newLine);
        for (int i = 0; i < lines.length; i++) {
            if (LOCATION_SECTION_PATTERN.matcher(lines[i]).matches()) {
                return new LocationEntry(lines, index, i, newLine);
            }
        }
        return null;
    }
}

class LocationEntry {

    private final Pattern SECTION_START_PATTERN = Pattern.compile("(?m)^.*\\{");

    private final Pattern SECTION_END_PATTERN = Pattern.compile("(?m)^\\s*\\}");

    private final List lines;

    private final int lineIndex;

    private final String newLine;

    private final int index;

    private int locationBodyEnd;

    public LocationEntry(String[] lines, int index, int lineIndex,
            String newLine) {
        this.lines = Arrays.asList(lines);
        this.index = index;
        this.lineIndex = lineIndex;
        this.newLine = newLine;
    }

    public LocationEntry insertBody(Collection body, int offset) {
        List list = new ArrayList();
        list.addAll(lines);
        list.addAll(offset, body);
        return new LocationEntry(list.toArray(new String[] {}), index,
                lineIndex, newLine);
    }

    public String getName() {
        Matcher matcher = NginxConfigList.LOCATION_SECTION_PATTERN
                .matcher(lines.get(lineIndex));
        matcher.find();
        return matcher.group(1);
    }

    public Collection getBody() {
        List body = new ArrayList();
        int level = 0;
        int i;
        for (i = lineIndex + 1; i < lines.size(); i++) {
            if (SECTION_START_PATTERN.matcher(lines.get(i)).find()) {
                level++;
            }
            if (SECTION_END_PATTERN.matcher(lines.get(i)).find()) {
                level--;
                if (level < 0) {
                    break;
                }
            }
            body.add(lines.get(i));
        }
        this.locationBodyEnd = i;
        return body;
    }

    public String getString() {
        return StringUtils.join(lines, newLine);
    }

    public int getIndex() {
        return index;
    }

    public int getLocationBodyEnd() {
        return locationBodyEnd;
    }
}