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1
18
19 package org.apache.tools.ant.types.resources;
20
21 import java.io.File  ;
22 import java.util.List ;
23 import java.util.Stack ;
24 import java.util.Vector ;
25 import java.util.Iterator ;
26 import java.util.Collection ;
27 import java.util.Collections ;
28 import java.util.AbstractCollection ;
29 import java.util.NoSuchElementException ;
30
31 import org.apache.tools.ant.Project;
32 import org.apache.tools.ant.BuildException;
33 import org.apache.tools.ant.types.DataType;
34 import org.apache.tools.ant.types.ResourceCollection;
35
36
41 public class Resources extends DataType implements ResourceCollection {
42
43 public static final ResourceCollection NONE = new ResourceCollection() {
44 public boolean isFilesystemOnly() {
45 return true;
46 }
47 public Iterator iterator() {
48 return EMPTY_ITERATOR;
49 }
50 public int size() {
51 return 0;
52 }
53 };
54
55
56 public static final Iterator EMPTY_ITERATOR = new Iterator () {
57 public Object next() {
58 throw new NoSuchElementException ();
59 }
60 public boolean hasNext() {
61 return false;
62 }
63 public void remove() {
64 throw new UnsupportedOperationException ();
65 }
66 };
67
68 private class MyCollection extends AbstractCollection {
69 private int size;
70
71 MyCollection() {
72 size = 0;
73 for (Iterator rci = getNested().iterator(); rci.hasNext();) {
74 size += ((ResourceCollection) rci.next()).size();
75 }
76 }
77 public int size() {
78 return size;
79 }
80 public Iterator iterator() {
81 return new MyIterator();
82 }
83 private class MyIterator implements Iterator {
84 private Iterator rci = getNested().iterator();
85 private Iterator ri = null;
86
87 public boolean hasNext() {
88 boolean result = ri != null && ri.hasNext();
89 while (!result && rci.hasNext()) {
90 ri = ((ResourceCollection) rci.next()).iterator();
91 result = ri.hasNext();
92 }
93 return result;
94 }
95 public Object next() {
96 if (!hasNext()) {
97 throw new NoSuchElementException ();
98 }
99 return ri.next();
100 }
101 public void remove() {
102 throw new UnsupportedOperationException ();
103 }
104 }
105 }
106
107 private Vector rc;
108 private Collection coll;
109
110
114 public synchronized void add(ResourceCollection c) {
115 if (isReference()) {
116 throw noChildrenAllowed();
117 }
118 if (c == null) {
119 return;
120 }
121 if (rc == null) {
122 rc = new Vector ();
123 }
124 rc.add(c);
125 FailFast.invalidate(this);
126 coll = null;
127 setChecked(false);
128 }
129
130
134 public synchronized Iterator iterator() {
135 if (isReference()) {
136 return getRef().iterator();
137 }
138 validate();
139 return new FailFast(this, coll.iterator());
140 }
141
142
146 public synchronized int size() {
147 if (isReference()) {
148 return getRef().size();
149 }
150 validate();
151 return coll.size();
152 }
153
154
158 public boolean isFilesystemOnly() {
159 if (isReference()) {
160 return getRef().isFilesystemOnly();
161 }
162 validate();
163
164 for (Iterator i = getNested().iterator(); i.hasNext();) {
165 if ((!((ResourceCollection) i.next()).isFilesystemOnly())) {
166 return false;
167 }
168 }
169 return true;
170 }
171
172
176 public synchronized String toString() {
177 if (isReference()) {
178 return getCheckedRef().toString();
179 }
180 if (coll == null || coll.isEmpty()) {
181 return "";
182 }
183 StringBuffer sb = new StringBuffer ();
184 for (Iterator i = coll.iterator(); i.hasNext();) {
185 if (sb.length() > 0) {
186 sb.append(File.pathSeparatorChar);
187 }
188 sb.append(i.next());
189 }
190 return sb.toString();
191 }
192
193
200 protected void dieOnCircularReference(Stack stk, Project p)
201 throws BuildException {
202 if (isChecked()) {
203 return;
204 }
205 if (isReference()) {
206 super.dieOnCircularReference(stk, p);
207 } else {
208 for (Iterator i = getNested().iterator(); i.hasNext();) {
209 Object o = i.next();
210 if (o instanceof DataType) {
211 invokeCircularReferenceCheck((DataType) o, stk, p);
212 }
213 }
214 setChecked(true);
215 }
216 }
217
218
222 private ResourceCollection getRef() {
223 return (ResourceCollection) getCheckedRef(
224 ResourceCollection.class, "ResourceCollection");
225 }
226
227 private synchronized void validate() {
228 dieOnCircularReference();
229 coll = (coll == null) ? new MyCollection() : coll;
230 }
231
232 private synchronized List getNested() {
233 return rc == null ? Collections.EMPTY_LIST : rc;
234 }
235 }
236 |
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