01: /*
02: * (c) Copyright 2007 by Volker Bergmann. All rights reserved.
03: *
04: * Redistribution and use in source and binary forms, with or without
05: * modification, is permitted under the terms of the
06: * GNU General Public License.
07: *
08: * For redistributing this software or a derivative work under a license other
09: * than the GPL-compatible Free Software License as defined by the Free
10: * Software Foundation or approved by OSI, you must first obtain a commercial
11: * license to this software product from Volker Bergmann.
12: *
13: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
14: * WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS,
15: * REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF
16: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE
17: * HEREBY EXCLUDED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
18: * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
19: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
20: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
21: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
22: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
23: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24: * POSSIBILITY OF SUCH DAMAGE.
25: */
26:
27: package org.databene.benerator;
28:
29: import org.databene.commons.Accessor;
30:
31: /**
32: * Returns the results of an accessor that is applied on a constant provider object.<br/>
33: * <br/>
34: * Created: 22.08.2007 19:05:40
35: */
36: public class AccessingGenerator extends LightweightGenerator {
37:
38: private Accessor accessor;
39: private Object provider;
40: private Class targetType;
41:
42: private boolean fetched;
43: private Object next;
44:
45: public AccessingGenerator(Class targetType, Accessor accessor,
46: Object provider) {
47: this .targetType = targetType;
48: this .accessor = accessor;
49: this .provider = provider;
50: this .fetched = false;
51: this .next = null;
52: }
53:
54: public boolean available() {
55: if (!fetched)
56: fetchNext();
57: return (next != null);
58: }
59:
60: public Class getGeneratedType() {
61: return targetType;
62: }
63:
64: public Object generate() {
65: if (!fetched)
66: fetchNext();
67: fetched = false;
68: return next;
69: }
70:
71: private void fetchNext() {
72: next = accessor.getValue(provider);
73: }
74:
75: public String toString() {
76: return getClass().getSimpleName() + "[accessor=" + accessor
77: + ']';
78: }
79: }
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