1
14 package ch.qos.logback.core.pattern;
15
16 import java.util.HashMap;
17 import java.util.Map;
18
19 import ch.qos.logback.core.Context;
20 import ch.qos.logback.core.CoreConstants;
21 import ch.qos.logback.core.LayoutBase;
22 import ch.qos.logback.core.pattern.parser.Node;
23 import ch.qos.logback.core.pattern.parser.Parser;
24 import ch.qos.logback.core.spi.ScanException;
25 import ch.qos.logback.core.status.ErrorStatus;
26 import ch.qos.logback.core.status.StatusManager;
27
28 abstract public class PatternLayoutBase<E> extends LayoutBase<E> {
29
30 static final int INTIAL_STRING_BUILDER_SIZE = 256;
31 Converter<E> head;
32 String pattern;
33 protected PostCompileProcessor<E> postCompileProcessor;
34
35 Map<String, String> instanceConverterMap = new HashMap<String, String>();
36 protected boolean outputPatternAsHeader = false;
37
38
44 abstract public Map<String, String> getDefaultConverterMap();
45
46
50 public Map<String, String> getEffectiveConverterMap() {
51 Map<String, String> effectiveMap = new HashMap<String, String>();
52
53
54 Map<String, String> defaultMap = getDefaultConverterMap();
55 if (defaultMap != null) {
56 effectiveMap.putAll(defaultMap);
57 }
58
59
60 Context context = getContext();
61 if (context != null) {
62 @SuppressWarnings("unchecked")
63 Map<String, String> contextMap = (Map<String, String>) context.getObject(CoreConstants.PATTERN_RULE_REGISTRY);
64 if (contextMap != null) {
65 effectiveMap.putAll(contextMap);
66 }
67 }
68
69 effectiveMap.putAll(instanceConverterMap);
70 return effectiveMap;
71 }
72
73 public void start() {
74 if (pattern == null || pattern.length() == 0) {
75 addError("Empty or null pattern.");
76 return;
77 }
78 try {
79 Parser<E> p = new Parser<E>(pattern);
80 if (getContext() != null) {
81 p.setContext(getContext());
82 }
83 Node t = p.parse();
84 this.head = p.compile(t, getEffectiveConverterMap());
85 if (postCompileProcessor != null) {
86 postCompileProcessor.process(context, head);
87 }
88 ConverterUtil.setContextForConverters(getContext(), head);
89 ConverterUtil.startConverters(this.head);
90 super.start();
91 } catch (ScanException sce) {
92 StatusManager sm = getContext().getStatusManager();
93 sm.add(new ErrorStatus("Failed to parse pattern \"" + getPattern() + "\".", this, sce));
94 }
95 }
96
97 public void setPostCompileProcessor(PostCompileProcessor<E> postCompileProcessor) {
98 this.postCompileProcessor = postCompileProcessor;
99 }
100
101
107 protected void setContextForConverters(Converter<E> head) {
108 ConverterUtil.setContextForConverters(getContext(), head);
109 }
110
111 protected String writeLoopOnConverters(E event) {
112 StringBuilder strBuilder = new StringBuilder(INTIAL_STRING_BUILDER_SIZE);
113 Converter<E> c = head;
114 while (c != null) {
115 c.write(strBuilder, event);
116 c = c.getNext();
117 }
118 return strBuilder.toString();
119 }
120
121 public String getPattern() {
122 return pattern;
123 }
124
125 public void setPattern(String pattern) {
126 this.pattern = pattern;
127 }
128
129 public String toString() {
130 return this.getClass().getName() + "(\"" + getPattern() + "\")";
131 }
132
133 public Map<String, String> getInstanceConverterMap() {
134 return instanceConverterMap;
135 }
136
137 protected String getPresentationHeaderPrefix() {
138 return CoreConstants.EMPTY_STRING;
139 }
140
141 public boolean isOutputPatternAsHeader() {
142 return outputPatternAsHeader;
143 }
144
145 public void setOutputPatternAsHeader(boolean outputPatternAsHeader) {
146 this.outputPatternAsHeader = outputPatternAsHeader;
147 }
148
149 @Override
150 public String getPresentationHeader() {
151 if (outputPatternAsHeader)
152 return getPresentationHeaderPrefix() + pattern;
153 else
154 return super.getPresentationHeader();
155 }
156 }
157