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1
11 package org.eclipse.jdt.internal.ui.text.correction;
12
13 import java.lang.reflect.Modifier  ;
14 import java.util.List ;
15
16 import org.eclipse.jdt.core.ICompilationUnit;
17 import org.eclipse.jdt.core.dom.AST;
18 import org.eclipse.jdt.core.dom.ASTNode;
19 import org.eclipse.jdt.core.dom.ChildListPropertyDescriptor;
20 import org.eclipse.jdt.core.dom.CompilationUnit;
21 import org.eclipse.jdt.core.dom.Expression;
22 import org.eclipse.jdt.core.dom.IBinding;
23 import org.eclipse.jdt.core.dom.ITypeBinding;
24 import org.eclipse.jdt.core.dom.IVariableBinding;
25 import org.eclipse.jdt.core.dom.StructuralPropertyDescriptor;
26 import org.eclipse.jdt.core.dom.rewrite.ASTRewrite;
27 import org.eclipse.jdt.core.dom.rewrite.ListRewrite;
28
29 import org.eclipse.jdt.internal.corext.dom.ASTNodeFactory;
30 import org.eclipse.jdt.internal.corext.dom.ASTNodes;
31 import org.eclipse.jdt.internal.corext.dom.ScopeAnalyzer;
32
33 import org.eclipse.jdt.internal.ui.JavaPluginImages;
34
35 public class AddArgumentCorrectionProposal extends LinkedCorrectionProposal {
36
37 private int[] fInsertIndexes;
38 private ITypeBinding[] fParamTypes;
39 private ASTNode fCallerNode;
40
41 public AddArgumentCorrectionProposal(String label, ICompilationUnit cu, ASTNode callerNode, int[] insertIdx, ITypeBinding[] expectedTypes, int relevance) {
42 super(label, cu, null, relevance, JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE));
43 fCallerNode= callerNode;
44 fInsertIndexes= insertIdx;
45 fParamTypes= expectedTypes;
46 }
47
48
51 protected ASTRewrite getRewrite() {
52 AST ast= fCallerNode.getAST();
53 ASTRewrite rewrite= ASTRewrite.create(ast);
54 ChildListPropertyDescriptor property= getProperty();
55
56 for (int i= 0; i < fInsertIndexes.length; i++) {
57 int idx= fInsertIndexes[i];
58 String key= "newarg_" + i; Expression newArg= evaluateArgumentExpressions(ast, fParamTypes[idx], key);
60 ListRewrite listRewriter= rewrite.getListRewrite(fCallerNode, property);
61 listRewriter.insertAt(newArg, idx, null);
62
63 addLinkedPosition(rewrite.track(newArg), i == 0, key);
64 }
65 return rewrite;
66 }
67
68 private ChildListPropertyDescriptor getProperty() {
69 List list= fCallerNode.structuralPropertiesForType();
70 for (int i= 0; i < list.size(); i++) {
71 StructuralPropertyDescriptor curr= (StructuralPropertyDescriptor) list.get(i);
72 if (curr.isChildListProperty() && "arguments".equals(curr.getId())) { return (ChildListPropertyDescriptor) curr;
74 }
75 }
76 return null;
77
78 }
79
80
81 private Expression evaluateArgumentExpressions(AST ast, ITypeBinding requiredType, String key) {
82 CompilationUnit root= (CompilationUnit) fCallerNode.getRoot();
83
84 int offset= fCallerNode.getStartPosition();
85 Expression best= null;
86 ITypeBinding bestType= null;
87
88 ScopeAnalyzer analyzer= new ScopeAnalyzer(root);
89 IBinding[] bindings= analyzer.getDeclarationsInScope(offset, ScopeAnalyzer.VARIABLES);
90 for (int i= 0; i < bindings.length; i++) {
91 IVariableBinding curr= (IVariableBinding) bindings[i];
92 ITypeBinding type= curr.getType();
93 if (type != null && canAssign(type, requiredType) && testModifier(curr)) {
94 if (best == null || isMoreSpecific(bestType, type)) {
95 best= ast.newSimpleName(curr.getName());
96 bestType= type;
97 }
98 addLinkedPositionProposal(key, curr.getName(), null);
99 }
100 }
101 Expression defaultExpression= ASTNodeFactory.newDefaultExpression(ast, requiredType);
102 if (best == null) {
103 best= defaultExpression;
104 }
105 addLinkedPositionProposal(key, ASTNodes.asString(defaultExpression), null);
106 return best;
107 }
108
109 private boolean isMoreSpecific(ITypeBinding best, ITypeBinding curr) {
110 return (canAssign(best, curr) && !canAssign(curr, best));
111 }
112
113
114 private boolean canAssign(ITypeBinding curr, ITypeBinding best) {
115 return curr.isAssignmentCompatible(best);
116 }
117
118 private boolean testModifier(IVariableBinding curr) {
119 int modifiers= curr.getModifiers();
120 int staticFinal= Modifier.STATIC | Modifier.FINAL;
121 if ((modifiers & staticFinal) == staticFinal) {
122 return false;
123 }
124 if (Modifier.isStatic(modifiers) && !ASTResolving.isInStaticContext(fCallerNode)) {
125 return false;
126 }
127 return true;
128 }
129 }
130 |
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