mirror of https://github.com/octoleo/plantuml.git
130 lines
4.6 KiB
Java
130 lines
4.6 KiB
Java
/*
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* Copyright 2003-2004, Franz-Josef Elmer, All rights reserved
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details
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* (http://www.gnu.org/copyleft/lesser.html).
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package jcckit.graphic;
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import jcckit.util.ConfigParameters;
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import jcckit.util.FactoryException;
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/**
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* Anchor of a graphical element. There exist only the three
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* instances {@link #LEFT_BOTTOM}, {@link #CENTER}, and
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* {@link #RIGHT_TOP}.
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* <p>
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* The anchor factor can be used in a position formular. Its value
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* for the three instances reads:
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* <p>
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* <center>
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* <table border=1 cellpadding=5>
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* <tr><th>Instance</th><th>Factor</th></tr>
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* <tr><td><tt>LEFT_BOTTOM</tt></td><td>0</td></tr>
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* <tr><td><tt>CENTER</tt></td><td>1</td></tr>
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* <tr><td><tt>RIGHT_TOP</tt></td><td>2</td></tr>
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* </table>
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* </center>
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*
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* @author Franz-Josef Elmer
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*/
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public class Anchor {
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/** Anchor constant. */
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public static final Anchor LEFT_BOTTOM = new Anchor(0),
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CENTER = new Anchor(1),
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RIGHT_TOP = new Anchor(2);
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private static final String LEFT_VALUE = "left",
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RIGHT_VALUE = "right",
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CENTER_VALUE = "center",
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TOP_VALUE = "top",
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BOTTOM_VALUE = "bottom";
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/**
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* Returns form the specified configuration parameters the
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* horizontal anchor defined by the specified key or the
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* specified default value.
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* @param config Configuration parameters.
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* @param key The key of the anchor. <tt>null</tt> is not allowed.
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* @param defaultValue The default value.
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* @return one of the three instances of <tt>Anchor</tt>.
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* @throws FactoryException if the value of <tt>key</tt> is
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* neither <tt>left</tt>, <tt>center</tt>,
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* nor <tt>right</tt>.
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* Note, that {@link FactoryException#getClassName()}
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* returns the invalid value.
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*/
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public static Anchor getHorizontalAnchor(ConfigParameters config, String key,
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Anchor defaultValue) {
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Anchor result = defaultValue;
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String anchor = config.get(key, null);
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if (anchor != null) {
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if (anchor.equals(LEFT_VALUE)) {
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result = Anchor.LEFT_BOTTOM;
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} else if (anchor.equals(CENTER_VALUE)) {
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result = Anchor.CENTER;
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} else if (anchor.equals(RIGHT_VALUE)) {
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result = Anchor.RIGHT_TOP;
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} else {
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throw new FactoryException(config, key, "Invalid horizontal anchor.");
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}
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}
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return result;
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}
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/**
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* Returns form the specified configuration parameters the
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* vertical anchor defined by the specified key or the
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* specified default value.
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* @param config Configuration parameters.
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* @param key The key of the anchor. <tt>null</tt> is not allowed.
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* @param defaultValue The default value.
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* @return one of the three instances of <tt>Anchor</tt>.
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* @throws FactoryException if the value of <tt>key</tt> is
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* neither <tt>top</tt>, <tt>center</tt>,
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* nor <tt>bottom</tt>.
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* Note, that {@link FactoryException#getClassName()}
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* returns the invalid value.
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*/
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public static Anchor getVerticalAnchor(ConfigParameters config, String key,
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Anchor defaultValue) {
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Anchor result = defaultValue;
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String anchor = config.get(key, null);
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if (anchor != null) {
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if (anchor.equals(BOTTOM_VALUE)) {
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result = Anchor.LEFT_BOTTOM;
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} else if (anchor.equals(CENTER_VALUE)) {
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result = Anchor.CENTER;
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} else if (anchor.equals(TOP_VALUE)) {
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result = Anchor.RIGHT_TOP;
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} else {
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throw new FactoryException(config, key, "Invalid vertcal anchor.");
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}
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}
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return result;
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}
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private final int _factor;
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private Anchor(int factor) {
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_factor = factor;
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}
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/** Returns the factor. */
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public int getFactor() {
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return _factor;
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}
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}
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