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1 package com.opensymphony.webwork.components;
2
3 import com.opensymphony.webwork.config.Configuration;
4 import com.opensymphony.webwork.util.FastByteArrayOutputStream;
5 import com.opensymphony.xwork.util.OgnlValueStack;
6 import com.opensymphony.xwork.util.TextParseUtil;
7
8 import java.io.PrintWriter  ;
9 import java.io.Writer ;
10 import java.util.HashMap ;
11 import java.util.Iterator ;
12 import java.util.Map ;
13 import java.util.Stack ;
14
15
20 public class Component {
21 public static final boolean ALT_SYNTAX = "true".equals(Configuration.getString("webwork.tag.altSyntax"));
22 public static final String COMPONENT_STACK = "__component_stack";
23
24 protected OgnlValueStack stack;
25 protected Map parameters;
26 protected String id;
27
28 public Component(OgnlValueStack stack) {
29 this.stack = stack;
30 this.parameters = new HashMap ();
31 getComponentStack().push(this);
32 }
33
34 public OgnlValueStack getStack() {
35 return stack;
36 }
37
38 private Stack getComponentStack() {
39 Stack componentStack = (Stack) stack.getContext().get(COMPONENT_STACK);
40 if (componentStack == null) {
41 componentStack = new Stack();
42 stack.getContext().put(COMPONENT_STACK, componentStack);
43 }
44 return componentStack;
45 }
46
47 public void start(Writer writer) {
48 }
49
50 public void end(Writer writer) {
51 getComponentStack().pop();
52 }
53
54 public Component findAncestor(Class clazz) {
55 Stack componentStack = getComponentStack();
56 for (Iterator iterator = componentStack.iterator(); iterator.hasNext();) {
57 Component component = (Component) iterator.next();
58 if (component.getClass().isAssignableFrom(clazz) && component != this) {
59 return component;
60 }
61 }
62
63 return null;
64 }
65
66 public Component findLastAncestor(Class clazz) {
67 Stack componentStack = getComponentStack();
68 for (int i = componentStack.size() - 1; i >= 0; i--) {
69 Component component = (Component) componentStack.get(i);
70 if (component.getClass().isAssignableFrom(clazz) && component != this) {
71 return component;
72 }
73 }
74
75 return null;
76 }
77
78 protected String findString(String expr) {
79 return (String ) findValue(expr, String .class);
80 }
81
82 protected Object findValue(String expr) {
83 if (expr == null) {
84 return null;
85 }
86
87 if (ALT_SYNTAX) {
88 if (expr.startsWith("%{") && expr.endsWith("}")) {
90 expr = expr.substring(2, expr.length() - 1);
91 }
92 }
93
94 return getStack().findValue(expr);
95 }
96
97 protected Object findValue(String expr, Class toType) {
98 if (ALT_SYNTAX && toType == String .class) {
99 return translateVariables(expr, getStack());
100 } else {
101 if (ALT_SYNTAX) {
102 if (expr.startsWith("%{") && expr.endsWith("}")) {
104 expr = expr.substring(2, expr.length() - 1);
105 }
106 }
107
108 return getStack().findValue(expr, toType);
109 }
110 }
111
112 public static String translateVariables(String expression, OgnlValueStack stack) {
113 return TextParseUtil.translateVariables('%', expression, stack);
114 }
115
116
124 public void copyParams(Map params) {
125 stack.push(parameters);
126 stack.push(this);
127 try {
128 for (Iterator iterator = params.entrySet().iterator(); iterator.hasNext();) {
129 Map.Entry entry = (Map.Entry ) iterator.next();
130 String key = (String ) entry.getKey();
131 stack.setValue(key, entry.getValue());
132 }
133 } finally {
134 stack.pop();
135 stack.pop();
136 }
137 }
138
139 protected String toString(Throwable t) {
140 FastByteArrayOutputStream bout = new FastByteArrayOutputStream();
141 PrintWriter wrt = new PrintWriter (bout);
142 t.printStackTrace(wrt);
143 wrt.close();
144
145 return bout.toString();
146 }
147
148 public Map getParameters() {
149 return parameters;
150 }
151
152 public void addAllParameters(Map params) {
153 parameters.putAll(params);
154 }
155
156 public void addParameter(String key, Object value) {
157 if (key != null) {
158 Map params = getParameters();
159
160 if (value == null) {
161 params.remove(key);
162 } else {
163 params.put(key, value);
164 }
165 }
166 }
167
168 public String getId() {
169 return id;
170 }
171
172 public void setId(String id) {
173 this.id = id;
174 }
175 }
176 |
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