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comparison flys-artifacts/src/main/java/de/intevation/flys/artifacts/datacage/templating/StackFrames.java @ 4594:2970046fcdca

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Doc.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Thu, 29 Nov 2012 11:48:20 +0100
parents de0c2bbb27f9
children 4d1e2a0c283a 142ed3c62765
comparison
equal deleted inserted replaced
4593:047c965ea542 4594:2970046fcdca
11 11
12 import javax.xml.namespace.QName; 12 import javax.xml.namespace.QName;
13 13
14 import org.apache.log4j.Logger; 14 import org.apache.log4j.Logger;
15 15
16
17 /**
18 * Maintains stack of 'frames' which are maps from string to object.
19 * Used for variables in datacage/meta-data system.
20 */
16 public class StackFrames 21 public class StackFrames
17 implements XPathVariableResolver 22 implements XPathVariableResolver
18 { 23 {
19 private static Logger log = Logger.getLogger(StackFrames.class); 24 private static Logger log = Logger.getLogger(StackFrames.class);
20 25
26 /** The frames (used like a stack). */
21 protected List<Map<String, Object>> frames; 27 protected List<Map<String, Object>> frames;
22 28
23 public StackFrames() { 29 public StackFrames() {
24 frames = new ArrayList<Map<String, Object>>(); 30 frames = new ArrayList<Map<String, Object>>();
25 } 31 }
29 if (initialFrame != null) { 35 if (initialFrame != null) {
30 frames.add(new HashMap<String, Object>(initialFrame)); 36 frames.add(new HashMap<String, Object>(initialFrame));
31 } 37 }
32 } 38 }
33 39
40 /** Push a new String->Object map. */
34 public void enter() { 41 public void enter() {
35 frames.add(new HashMap<String, Object>()); 42 frames.add(new HashMap<String, Object>());
36 } 43 }
37 44
45 /** Pop/Remove last String->Object map. */
38 public void leave() { 46 public void leave() {
39 frames.remove(frames.size()-1); 47 frames.remove(frames.size()-1);
40 } 48 }
41 49
50 /** Put Key/Value in last String->Object map. */
42 public void put(String key, Object value) { 51 public void put(String key, Object value) {
43 int N = frames.size(); 52 int N = frames.size();
44 if (N > 0) { 53 if (N > 0) {
45 frames.get(N-1).put(key, value); 54 frames.get(N-1).put(key, value);
46 } 55 }
47 } 56 }
48 57
58 /** Put multiple Key/Values in last String->Object map. */
49 public void put(String [] keys, Object [] values) { 59 public void put(String [] keys, Object [] values) {
50 Map<String, Object> top = frames.get(frames.size()-1); 60 Map<String, Object> top = frames.get(frames.size()-1);
51 for (int i = 0; i < keys.length; ++i) { 61 for (int i = 0; i < keys.length; ++i) {
52 top.put(keys[i], values[i]); 62 top.put(keys[i], values[i]);
53 } 63 }
54 } 64 }
55 65
66 /** Check last frame (string->object map) for key. */
56 public boolean containsKey(String key) { 67 public boolean containsKey(String key) {
57 key = key.toUpperCase(); 68 key = key.toUpperCase();
58 for (int i = frames.size()-1; i >= 0; --i) { 69 for (int i = frames.size()-1; i >= 0; --i) {
59 if (frames.get(i).containsKey(key)) { 70 if (frames.get(i).containsKey(key)) {
60 return true; 71 return true;
71 */ 82 */
72 public Object get(String key) { 83 public Object get(String key) {
73 return get(key, null); 84 return get(key, null);
74 } 85 }
75 86
87 /** result[0] is modified with value when true returned.
88 * @return false if key not found in any frame. */
76 public boolean getStore(String key, Object [] result) { 89 public boolean getStore(String key, Object [] result) {
77 90
78 key = key.toUpperCase(); 91 key = key.toUpperCase();
79 92
80 for (int i = frames.size()-1; i >= 0; --i) { 93 for (int i = frames.size()-1; i >= 0; --i) {
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