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1
52
53
56
57 package freemarker.core;
58
59 import java.util.ArrayList  ;
60 import java.util.List ;
61 import java.io.Writer ;
62 import freemarker.template.*;
63 import java.io.IOException ;
64
65
66
70 final class MethodCall extends Expression {
71
72 private final Expression target;
73 private final ListLiteral arguments;
74
75 MethodCall(Expression target, ArrayList arguments) {
76 this(target, new ListLiteral(arguments));
77 }
78
79 private MethodCall(Expression target, ListLiteral arguments) {
80 this.target = target;
81 this.arguments = arguments;
82 }
83
84 TemplateModel _getAsTemplateModel(Environment env) throws TemplateException
85 {
86 TemplateModel targetModel = target.getAsTemplateModel(env);
87 if (targetModel instanceof TemplateMethodModel) {
88 TemplateMethodModel targetMethod = (TemplateMethodModel)targetModel;
89 List argumentStrings =
90 targetMethod instanceof TemplateMethodModelEx
91 ? arguments.getModelList(env)
92 : arguments.getValueList(env);
93 Object result = targetMethod.exec(argumentStrings);
94 return env.getObjectWrapper().wrap(result);
95 }
96 else if (targetModel instanceof Macro) {
97 Macro func = (Macro) targetModel;
98 env.setLastReturnValue(null);
99 if (!func.isFunction) {
100 throw new TemplateException("A macro cannot be called in an expression.", env);
101 }
102 Writer prevOut = env.getOut();
103 try {
104 env.setOut(Environment.NULL_WRITER);
105 env.visit(func, null, arguments.values, null, null);
106 } catch (IOException ioe) {
107 throw new InternalError ("This should be impossible.");
108 } finally {
109 env.setOut(prevOut);
110 }
111 return env.getLastReturnValue();
112 }
113 else {
114 throw invalidTypeException(targetModel, target, env, "method");
115 }
116 }
117
118 public String getCanonicalForm() {
119 StringBuffer buf = new StringBuffer ();
120 buf.append(target.getCanonicalForm());
121 buf.append("(");
122 String list = arguments.getCanonicalForm();
123 buf.append(list.substring(1, list.length() -1));
124 buf.append(")");
125 return buf.toString();
126 }
127
128 TemplateModel getConstantValue() {
129 return null;
130 }
131
132 boolean isLiteral() {
133 return false;
134 }
135
136 Expression _deepClone(String name, Expression subst) {
137 return new MethodCall(target.deepClone(name, subst), (ListLiteral)arguments.deepClone(name, subst));
138 }
139
140 }
141 |
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