001: /*
002: * $Header: /export/home/cvsroot/MyPersonalizerRepository/MyPersonalizer/Subsystems/Kernel/Sources/es/udc/mypersonalizer/kernel/model/properties/PropertyNaming.java,v 1.1.1.1 2004/03/25 12:08:37 fbellas Exp $
003: * $Revision: 1.1.1.1 $
004: * $Date: 2004/03/25 12:08:37 $
005: *
006: * =============================================================================
007: *
008: * Copyright (c) 2003, The MyPersonalizer Development Group
009: * (http://www.tic.udc.es/~fbellas/mypersonalizer/index.html) at
010: * University Of A Coruna
011: * All rights reserved.
012: *
013: * Redistribution and use in source and binary forms, with or without
014: * modification, are permitted provided that the following conditions are met:
015: *
016: * - Redistributions of source code must retain the above copyright notice,
017: * this list of conditions and the following disclaimer.
018: *
019: * - Redistributions in binary form must reproduce the above copyright notice,
020: * this list of conditions and the following disclaimer in the documentation
021: * and/or other materials provided with the distribution.
022: *
023: * - Neither the name of the University Of A Coruna nor the names of its
024: * contributors may be used to endorse or promote products derived from
025: * this software without specific prior written permission.
026: *
027: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
028: * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
029: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
030: * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
031: * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
032: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
033: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
034: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
035: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
036: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
037: * POSSIBILITY OF SUCH DAMAGE.
038: *
039: */
040:
041: package es.udc.mypersonalizer.kernel.model.properties;
042:
043: /**
044: * This utility class provides methods for common operations on property and
045: * meta-property names. In both cases, a name is considered to be composed of
046: * "components" separated by the character ".".
047: *
048: * @author Fernando Bellas
049: * @since 1.0
050: */
051: public final class PropertyNaming {
052:
053: /**
054: * Disables to create an instance of this (utility) class.
055: */
056: private PropertyNaming() {
057: }
058:
059: /**
060: * Checks if a given <code>name</code> is simple, that is, if contains ".".
061: *
062: * @param name a name
063: * @return <code>true</code> if <code>name</code> is simple;
064: * <code>false</code> otherwise
065: */
066: public static boolean isSimple(String name) {
067:
068: if (name.indexOf('.') == -1) {
069: return true;
070: } else {
071: return false;
072: }
073:
074: }
075:
076: /**
077: * Gets the last component of a <code>name</code>. If the name is simple,
078: * it returns the same name.
079: *
080: * @param name a name
081: * @return the last component of the name
082: */
083: public static String getLastComponent(String name) {
084:
085: int index = name.lastIndexOf('.');
086:
087: if (index == -1) {
088: return name;
089: } else {
090: return name.substring(index + 1);
091: }
092:
093: }
094:
095: /**
096: * Removes the last component of a <code>name</code>. If the name is
097: * simple, it returns "".
098: *
099: * @param name a name
100: * @return the name without the last componet
101: */
102: public static String removeLastComponent(String name) {
103:
104: int index = name.lastIndexOf('.');
105:
106: if (index == -1) {
107: return "";
108: } else {
109: return name.substring(0, index);
110: }
111:
112: }
113:
114: /**
115: * Returns the name of the meta-property corresponding to the property
116: * specified by a property name. This property name must be relative to
117: * the root property, that is, it must start with an index. So, for
118: * example, if the property name is "3.a.4.b", it returns "a.b". The
119: * returned meta-property name is relative to the root meta-property. The
120: * implementation assumes the meta-property name passed as a parameter
121: * is correct. If not, the method will not fail, but the returned string
122: * will not be a correct meta-property name.
123: *
124: * @param propertyName a property name relative to the root property
125: * @return the name of the meta-property corresponding to the property
126: * named by the property name passed as a parameter
127: */
128: public static String toMetaPropertyName(String propertyName) {
129:
130: StringBuffer metaPropertyName = new StringBuffer();
131: int leftIndex = 0;
132: int rightIndex;
133: boolean odd = false;
134:
135: /*
136: * Copy components in odd positions (numbered from 0 upwards) in
137: * "propertyName" to "metaPropertyName". Example:
138: * propertyName = 3.a.4.b => metaPropertyName = a.b (components in
139: * even positions, 0 and 2, are not copied).
140: */
141: do {
142:
143: rightIndex = propertyName.indexOf('.', leftIndex);
144: String component;
145:
146: if (rightIndex == -1) {
147: component = propertyName.substring(leftIndex);
148: } else {
149: component = propertyName.substring(leftIndex,
150: rightIndex);
151: }
152:
153: if (odd) {
154: if (metaPropertyName.length() == 0) {
155: metaPropertyName.append(component);
156: } else {
157: metaPropertyName.append('.' + component);
158: }
159: }
160:
161: if (rightIndex != -1) {
162: leftIndex = rightIndex + 1;
163: odd = !odd;
164: }
165:
166: } while (rightIndex != -1);
167:
168: return metaPropertyName.toString();
169:
170: }
171:
172: }
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