Source Code Cross Referenced for ForEach.java in  » IDE-Netbeans » nbi » org » netbeans » installer » infra » build » ant » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE Netbeans » nbi » org.netbeans.installer.infra.build.ant 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003:         * 
004:         * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005:         * 
006:         * The contents of this file are subject to the terms of either the GNU General
007:         * Public License Version 2 only ("GPL") or the Common Development and Distribution
008:         * License("CDDL") (collectively, the "License"). You may not use this file except in
009:         * compliance with the License. You can obtain a copy of the License at
010:         * http://www.netbeans.org/cddl-gplv2.html or nbbuild/licenses/CDDL-GPL-2-CP. See the
011:         * License for the specific language governing permissions and limitations under the
012:         * License.  When distributing the software, include this License Header Notice in
013:         * each file and include the License file at nbbuild/licenses/CDDL-GPL-2-CP.  Sun
014:         * designates this particular file as subject to the "Classpath" exception as
015:         * provided by Sun in the GPL Version 2 section of the License file that
016:         * accompanied this code. If applicable, add the following below the License Header,
017:         * with the fields enclosed by brackets [] replaced by your own identifying
018:         * information: "Portions Copyrighted [year] [name of copyright owner]"
019:         * 
020:         * Contributor(s):
021:         * 
022:         * The Original Software is NetBeans. The Initial Developer of the Original Software
023:         * is Sun Microsystems, Inc. Portions Copyright 1997-2007 Sun Microsystems, Inc. All
024:         * Rights Reserved.
025:         * 
026:         * If you wish your version of this file to be governed by only the CDDL or only the
027:         * GPL Version 2, indicate your decision by adding "[Contributor] elects to include
028:         * this software in this distribution under the [CDDL or GPL Version 2] license." If
029:         * you do not indicate a single choice of license, a recipient has the option to
030:         * distribute your version of this file under either the CDDL, the GPL Version 2 or
031:         * to extend the choice of license to its licensees as provided above. However, if
032:         * you add GPL Version 2 code and therefore, elected the GPL Version 2 license, then
033:         * the option applies only if the new code is made subject to such option by the
034:         * copyright holder.
035:         */
036:
037:        package org.netbeans.installer.infra.build.ant;
038:
039:        import java.util.LinkedList;
040:        import java.util.List;
041:        import org.apache.tools.ant.BuildException;
042:        import org.apache.tools.ant.Task;
043:        import org.apache.tools.ant.TaskContainer;
044:
045:        /**
046:         * This class is an ant task which adds the for-loop functionality. It is an
047:         * arbitrary tasks container, which is capable of executing its childrne ina loop.
048:         *
049:         * <p>
050:         * Two types of loops are supported. First, iterating of over a list of values; in
051:         * this case the <code>list</code> and <code>separator</code> (optional) attributes
052:         * should be set and the property speficied with <code>property</code> attribute
053:         * will be set to each of the value speficied in the the list.
054:         *
055:         * <p>
056:         * Second, iterating of a range of integers. In this case the <code>from</code>,
057:         * <code>to</code> and <code>increment</code> (optional) attributes should be set,
058:         * meaning the starting point, the finish point and the step. Note that if one
059:         * specifies a negative step, the iteration could go backwards.
060:         *
061:         * <p>
062:         * If a mixture of attributes is supplied, iterating over a list is preferred.
063:         *
064:         * @author Kirill Sorokin
065:         */
066:        public class ForEach extends Task implements  TaskContainer {
067:            /////////////////////////////////////////////////////////////////////////////////
068:            // Instance
069:            /**
070:             * The list of values over which the iteration process should go.
071:             */
072:            private String list;
073:
074:            /**
075:             * Separator token which should be used to split the list string into individual
076:             * values.
077:             */
078:            private String separator;
079:
080:            /**
081:             * Starting point for iteration over an integer range.
082:             */
083:            private int from;
084:
085:            /**
086:             * Ending point for iteration over an integer range.
087:             */
088:            private int to;
089:
090:            /**
091:             * Step amount for iteration over an integer range.
092:             */
093:            private int increment;
094:
095:            /**
096:             * Name of the property which has to be set for each iteration.
097:             */
098:            private String property;
099:
100:            /**
101:             * List of child tasks which should be executed at each iteration.
102:             */
103:            private List<Task> children;
104:
105:            /**
106:             * Flag which marks incorrect attribute values.
107:             */
108:            private boolean wrongArgs;
109:
110:            // constructor //////////////////////////////////////////////////////////////////
111:            /**
112:             * Constructs a new instance of the {@link ForEach} task. It simply sets the
113:             * default values for the attributes.
114:             */
115:            public ForEach() {
116:                separator = DEFAULT_SEPARATOR;
117:
118:                from = DEFAULT_FROM;
119:                to = DEFAULT_TO;
120:                increment = DEFAULT_INCREMENT;
121:
122:                children = new LinkedList<Task>();
123:            }
124:
125:            // setters //////////////////////////////////////////////////////////////////////
126:            /**
127:             * Setter for the 'list' property.
128:             * 
129:             * @param list The new value for the 'list' property.
130:             */
131:            public void setList(final String list) {
132:                this .list = list;
133:            }
134:
135:            /**
136:             * Setter for the 'separator' property.
137:             * 
138:             * @param separator The new value for the 'separator' property.
139:             */
140:            public void setSeparator(final String separator) {
141:                this .separator = separator;
142:            }
143:
144:            /**
145:             * Setter for the 'property' property.
146:             * 
147:             * @param property The new value for the 'property' property.
148:             */
149:            public void setProperty(final String property) {
150:                this .property = property;
151:            }
152:
153:            /**
154:             * Setter for the 'from' property.
155:             * 
156:             * @param from The new value for the 'from' property.
157:             */
158:            public void setFrom(final String from) {
159:                try {
160:                    this .from = Integer.parseInt(from);
161:                } catch (NumberFormatException e) {
162:                    log("Wrong value for parameter 'from'."); // NOI18N
163:                    wrongArgs = true;
164:                }
165:            }
166:
167:            /**
168:             * Setter for the 'to' property.
169:             * 
170:             * @param to The new value for the 'to' property.
171:             */
172:            public void setTo(final String to) {
173:                try {
174:                    this .to = Integer.parseInt(to);
175:                } catch (NumberFormatException e) {
176:                    log("Wrong value for parameter 'to'."); // NOI18N
177:                    wrongArgs = true;
178:                }
179:            }
180:
181:            /**
182:             * Setter for the 'increment' property.
183:             * 
184:             * @param increment The new value for the 'increment' property.
185:             */
186:            public void setIncrement(final String increment) {
187:                try {
188:                    this .increment = Integer.parseInt(increment);
189:                } catch (NumberFormatException e) {
190:                    log("Wrong value for parameter 'increment'."); // NOI18N
191:                    wrongArgs = true;
192:                }
193:            }
194:
195:            /**
196:             * Registers a child task. The supplied <code>Task</code> object will be added 
197:             * to the list of child tasks and then executed at each iteration.
198:             * 
199:             * @param task The <code>Task</code> object to register.
200:             */
201:            public void addTask(final Task task) {
202:                children.add(task);
203:            }
204:
205:            // execution ////////////////////////////////////////////////////////////////////
206:            /**
207:             * Executes the task. Basing on which attributes were set, the choice is made of
208:             * whether the iteration should happen over a list or an integer range. Then the
209:             * iteration takes place the specified property is set and the child tasks are 
210:             * executed.
211:             * 
212:             * @throws org.apache.tools.ant.BuildException if a child task fails to execute.
213:             */
214:            public void execute() throws BuildException {
215:                if (wrongArgs) {
216:                    throw new BuildException(
217:                            "Correct parameters were not supplied."); // NOI18N
218:                }
219:
220:                if (list != null) {
221:                    final String[] items = list.split(separator);
222:
223:                    for (String value : items) {
224:                        executeChildren(value);
225:                    }
226:                    return;
227:                } else {
228:                    for (int i = from; i <= to; i += increment) {
229:                        executeChildren(Integer.toString(i));
230:                    }
231:                }
232:            }
233:
234:            // private //////////////////////////////////////////////////////////////////////
235:            /**
236:             * Sets the specified property to the given value and executes the children.
237:             */
238:            private void executeChildren(String value) throws BuildException {
239:                getProject().setProperty(this .property, value);
240:
241:                for (Task task : this .children) {
242:                    task.perform();
243:                }
244:            }
245:
246:            /////////////////////////////////////////////////////////////////////////////////
247:            // Constants
248:            /**
249:             * Default value for the 'separator' property.
250:             */
251:            private static final String DEFAULT_SEPARATOR = " "; // NOI18N
252:
253:            /**
254:             * Default value for the 'from' property.
255:             */
256:            private static final int DEFAULT_FROM = 0; // NOMAGI
257:
258:            /**
259:             * Default value for the 'to' property.
260:             */
261:            private static final int DEFAULT_TO = 0; // NOMAGI
262:
263:            /**
264:             * Default value for the 'increment' property.
265:             */
266:            private static final int DEFAULT_INCREMENT = 1; // NOMAGI
267:        }
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