| /* CombinedAttributes.java -- A two combined sets of attributes |
| Copyright (C) 2006 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.javax.swing.text.html; |
| |
| import java.io.Serializable; |
| import java.util.Enumeration; |
| |
| import javax.swing.text.AttributeSet; |
| import javax.swing.text.SimpleAttributeSet; |
| |
| /** |
| * Contains the two combined attribute sets what are searched subsequently. |
| * This is used to combine style sheet attributes with the HTML view attributes. |
| * The parent cannot be used as the view may have its own attribute hierarchy. |
| * |
| * @author Audrius Meskauskas (AudriusA@Bioinformatics.org) |
| */ |
| public class CombinedAttributes implements AttributeSet, Serializable |
| { |
| /** |
| * Returns the elements from both enumerations. |
| */ |
| class CombinedEnumeration implements Enumeration |
| { |
| /** |
| * Create a combined enumeration that enumerates over two enumerations. |
| * |
| * @param first the first enumeration to enumerate |
| * @param second the second enumeration to enumerate |
| */ |
| CombinedEnumeration(Enumeration first, Enumeration second) |
| { |
| a = first; |
| b = second; |
| } |
| |
| /** |
| * The first enumeration (elements returned first) |
| */ |
| final Enumeration a; |
| |
| /** |
| * The second enumeration (elements returned later) |
| */ |
| final Enumeration b; |
| |
| /** @inheritDoc */ |
| public boolean hasMoreElements() |
| { |
| return a.hasMoreElements() || b.hasMoreElements(); |
| } |
| |
| /** @inheritDoc */ |
| public Object nextElement() |
| { |
| return a.hasMoreElements() ? a.nextElement():b.nextElement(); |
| } |
| } |
| |
| |
| /** |
| * The first attribute set. |
| */ |
| final AttributeSet a; |
| |
| /** |
| * The second attribute set. |
| */ |
| final AttributeSet b; |
| |
| /** |
| * Create the CombinedAttributes what search in the two sets. If any of the |
| * two passed sets is null, another set is returned. Otherwise, the combined |
| * attribute set is returned. |
| * |
| * @param primary the first set (searched first) |
| * @param secondary the second set (searched later). |
| */ |
| public static AttributeSet combine(AttributeSet primary, |
| AttributeSet secondary) |
| { |
| if (primary == null) |
| return secondary; |
| else if (secondary == null) |
| return primary; |
| else |
| return new CombinedAttributes(primary, secondary); |
| } |
| |
| /** |
| * Create the CombinedAttributes what search in the two sets. |
| * |
| * @param primary the first set (searched first) |
| * @param secondary the second set (searched later). |
| */ |
| private CombinedAttributes(AttributeSet primary, AttributeSet secondary) |
| { |
| a = primary; |
| b = secondary; |
| } |
| |
| /** @inheritDoc */ |
| public boolean containsAttribute(Object name, Object value) |
| { |
| return a.containsAttribute(name, value) || b.containsAttribute(name, value); |
| } |
| |
| /** @inheritDoc */ |
| public boolean containsAttributes(AttributeSet attributes) |
| { |
| Enumeration names = attributes.getAttributeNames(); |
| Object name; |
| while (names.hasMoreElements()) |
| { |
| name = names.nextElement(); |
| if (!containsAttribute(name, attributes.getAttribute(name))) |
| return false; |
| } |
| return true; |
| } |
| |
| /** @inheritDoc */ |
| public AttributeSet copyAttributes() |
| { |
| SimpleAttributeSet copy = new SimpleAttributeSet(); |
| copy.addAttributes(a); |
| copy.addAttributes(b); |
| return copy; |
| } |
| |
| /** @inheritDoc */ |
| public Object getAttribute(Object key) |
| { |
| Object value = a.getAttribute(key); |
| if (value == null) |
| value = b.getAttribute(key); |
| |
| return value; |
| } |
| |
| /** @inheritDoc */ |
| public int getAttributeCount() |
| { |
| return a.getAttributeCount()+b.getAttributeCount(); |
| } |
| |
| /** @inheritDoc */ |
| public Enumeration getAttributeNames() |
| { |
| return new CombinedEnumeration(a.getAttributeNames(), b.getAttributeNames()); |
| } |
| |
| /** |
| * There is no one. |
| * |
| * @return null, always. |
| */ |
| public AttributeSet getResolveParent() |
| { |
| return null; |
| } |
| |
| /** @inheritDoc */ |
| public boolean isDefined(Object attrName) |
| { |
| return a.isDefined(attrName) || b.isDefined(attrName); |
| } |
| |
| /** @inheritDoc */ |
| public boolean isEqual(AttributeSet attr) |
| { |
| if (attr.getAttributeCount() == getAttributeCount()) |
| return containsAttributes(attr); |
| else |
| return false; |
| } |
| } |