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62 package org.codehaus.groovy.ant;
63
64 import java.io.File;
65 import java.util.Iterator;
66 import java.util.NoSuchElementException;
67
68 import org.apache.tools.ant.DirectoryScanner;
69 import org.apache.tools.ant.Project;
70 import org.apache.tools.ant.types.FileSet;
71
72 /***
73 * <p><code>FileIterator</code> is an iterator over a
74 * over a number of files from a colleciton of FileSet instances.
75 *
76 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
77 * @version $Revision: 1.1 $
78 */
79 public class FileIterator implements Iterator {
80
81 /*** The iterator over the FileSet objects */
82 private Iterator fileSetIterator;
83
84 /*** The Ant project */
85 private Project project;
86
87 /*** The directory scanner */
88 private DirectoryScanner ds;
89
90 /*** The file names in the current FileSet scan */
91 private String[] files;
92
93 /*** The current index into the file name array */
94 private int fileIndex = -1;
95
96 /*** The next File object we'll iterate over */
97 private File nextFile;
98
99 /*** Have we set a next object? */
100 private boolean nextObjectSet = false;
101
102 /*** Return only directories? */
103 private boolean iterateDirectories = false;
104
105 public FileIterator(Project project,
106 Iterator fileSetIterator) {
107 this( project, fileSetIterator, false);
108 }
109
110 public FileIterator(Project project,
111 Iterator fileSetIterator,
112 boolean iterateDirectories) {
113 this.project = project;
114 this.fileSetIterator = fileSetIterator;
115 this.iterateDirectories = iterateDirectories;
116 }
117
118
119
120
121 /*** @return true if there is another object that matches the given predicate */
122 public boolean hasNext() {
123 if ( nextObjectSet ) {
124 return true;
125 }
126 else {
127 return setNextObject();
128 }
129 }
130
131 /*** @return the next object which matches the given predicate */
132 public Object next() {
133 if ( !nextObjectSet ) {
134 if (!setNextObject()) {
135 throw new NoSuchElementException();
136 }
137 }
138 nextObjectSet = false;
139 return nextFile;
140 }
141
142 /***
143 * throws UnsupportedOperationException
144 */
145 public void remove() {
146 throw new UnsupportedOperationException();
147 }
148
149
150
151
152 /***
153 * Set nextObject to the next object. If there are no more
154 * objects then return false. Otherwise, return true.
155 */
156 private boolean setNextObject() {
157 while (true) {
158 while (ds == null) {
159 if ( ! fileSetIterator.hasNext() ) {
160 return false;
161 }
162 FileSet fs = (FileSet) fileSetIterator.next();
163 ds = fs.getDirectoryScanner(project);
164 ds.scan();
165 if (iterateDirectories) {
166 files = ds.getIncludedDirectories();
167 }
168 else {
169 files = ds.getIncludedFiles();
170 }
171 if ( files.length > 0 ) {
172 fileIndex = -1;
173 break;
174 }
175 else {
176 ds = null;
177 }
178 }
179
180 if ( ds != null && files != null ) {
181 if ( ++fileIndex < files.length ) {
182 nextFile = new File( ds.getBasedir(), files[fileIndex] );
183 nextObjectSet = true;
184 return true;
185 }
186 else {
187 ds = null;
188 }
189 }
190 }
191 }
192 }
193
194