001: /*
002: * This file is part of the Echo Web Application Framework (hereinafter "Echo").
003: * Copyright (C) 2002-2005 NextApp, Inc.
004: *
005: * Version: MPL 1.1/GPL 2.0/LGPL 2.1
006: *
007: * The contents of this file are subject to the Mozilla Public License Version
008: * 1.1 (the "License"); you may not use this file except in compliance with
009: * the License. You may obtain a copy of the License at
010: * http://www.mozilla.org/MPL/
011: *
012: * Software distributed under the License is distributed on an "AS IS" basis,
013: * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
014: * for the specific language governing rights and limitations under the
015: * License.
016: *
017: * Alternatively, the contents of this file may be used under the terms of
018: * either the GNU General Public License Version 2 or later (the "GPL"), or
019: * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
020: * in which case the provisions of the GPL or the LGPL are applicable instead
021: * of those above. If you wish to allow use of your version of this file only
022: * under the terms of either the GPL or the LGPL, and not to allow others to
023: * use your version of this file under the terms of the MPL, indicate your
024: * decision by deleting the provisions above and replace them with the notice
025: * and other provisions required by the GPL or the LGPL. If you do not delete
026: * the provisions above, a recipient may use your version of this file under
027: * the terms of any one of the MPL, the GPL or the LGPL.
028: */
029:
030: package nextapp.echo2.app;
031:
032: /**
033: * A <code>MutableStyle</code> which will retrieve properties from a
034: * "parent" style when they are not set locally.
035: */
036: public class DerivedMutableStyle extends MutableStyle {
037:
038: private Style parentStyle;
039:
040: /**
041: * Default constructor.
042: */
043: public DerivedMutableStyle() {
044: super ();
045: }
046:
047: /**
048: * Creates a new <code>DerivedMutableStyle</code>.
049: *
050: * @param parentStyle the style from which to retrieve properties
051: * when they are not set within this style
052: */
053: public DerivedMutableStyle(Style parentStyle) {
054: this .parentStyle = parentStyle;
055: }
056:
057: /**
058: * Returns the parent style.
059: *
060: * @return the parent style
061: */
062: public Style getParentStyle() {
063: return parentStyle;
064: }
065:
066: /**
067: * @see nextapp.echo2.app.Style#getIndexedProperty(java.lang.String, int)
068: */
069: public Object getIndexedProperty(String propertyName,
070: int propertyIndex) {
071: if (super .isIndexedPropertySet(propertyName, propertyIndex)) {
072: return super
073: .getIndexedProperty(propertyName, propertyIndex);
074: } else if (parentStyle != null) {
075: return parentStyle.getIndexedProperty(propertyName,
076: propertyIndex);
077: } else {
078: return null;
079: }
080: }
081:
082: /**
083: * @see nextapp.echo2.app.Style#getProperty(java.lang.String)
084: */
085: public Object getProperty(String propertyName) {
086: if (super .isPropertySet(propertyName)) {
087: return super .getProperty(propertyName);
088: } else if (parentStyle != null) {
089: return parentStyle.getProperty(propertyName);
090: } else {
091: return null;
092: }
093: }
094:
095: /**
096: * @see nextapp.echo2.app.Style#isIndexedPropertySet(java.lang.String, int)
097: */
098: public boolean isIndexedPropertySet(String propertyName,
099: int propertyIndex) {
100: return super .isIndexedPropertySet(propertyName, propertyIndex)
101: || (parentStyle != null && parentStyle
102: .isIndexedPropertySet(propertyName,
103: propertyIndex));
104: }
105:
106: /**
107: * @see nextapp.echo2.app.Style#isPropertySet(java.lang.String)
108: */
109: public boolean isPropertySet(String propertyName) {
110: return super .isPropertySet(propertyName)
111: || (parentStyle != null && parentStyle
112: .isPropertySet(propertyName));
113: }
114:
115: /**
116: * Sets the parent style, from which properties will be retrieved if they
117: * are not found in this style.
118: *
119: * @param parentStyle the parent style
120: */
121: public void setParentStyle(Style parentStyle) {
122: this.parentStyle = parentStyle;
123: }
124: }
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