| /******************************************************************************* |
| * Copyright (c) 2000, 2006 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.jdt.internal.ui.text.correction; |
| |
| import org.eclipse.core.runtime.CoreException; |
| |
| import org.eclipse.jdt.core.ICompilationUnit; |
| |
| import org.eclipse.jdt.core.dom.AST; |
| import org.eclipse.jdt.core.dom.ASTNode; |
| import org.eclipse.jdt.core.dom.CastExpression; |
| import org.eclipse.jdt.core.dom.CompilationUnit; |
| import org.eclipse.jdt.core.dom.Expression; |
| import org.eclipse.jdt.core.dom.FieldAccess; |
| import org.eclipse.jdt.core.dom.IBinding; |
| import org.eclipse.jdt.core.dom.ITypeBinding; |
| import org.eclipse.jdt.core.dom.MethodInvocation; |
| import org.eclipse.jdt.core.dom.ParenthesizedExpression; |
| import org.eclipse.jdt.core.dom.QualifiedName; |
| import org.eclipse.jdt.core.dom.Type; |
| import org.eclipse.jdt.core.dom.rewrite.ASTRewrite; |
| import org.eclipse.jdt.core.dom.rewrite.ImportRewrite; |
| |
| import org.eclipse.jdt.internal.corext.dom.ASTNodeFactory; |
| import org.eclipse.jdt.internal.ui.JavaPluginImages; |
| |
| public class CastCompletionProposal extends LinkedCorrectionProposal { |
| |
| public static final String ADD_CAST_ID= "org.eclipse.jdt.ui.correction.addCast"; //$NON-NLS-1$ |
| |
| private Expression fNodeToCast; |
| private final Object fCastType; // String or ITypeBinding or null: Should become ITypeBinding |
| |
| public CastCompletionProposal(String label, ICompilationUnit targetCU, Expression nodeToCast, String castType, int relevance) { |
| super(label, targetCU, null, relevance, JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CAST)); |
| fNodeToCast= nodeToCast; |
| fCastType= castType; |
| setCommandId(ADD_CAST_ID); |
| } |
| |
| public CastCompletionProposal(String label, ICompilationUnit targetCU, Expression nodeToCast, ITypeBinding castType, int relevance) { |
| super(label, targetCU, null, relevance, JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CAST)); |
| fNodeToCast= nodeToCast; |
| fCastType= castType; |
| setCommandId(ADD_CAST_ID); |
| } |
| |
| private Type getNewCastTypeNode(ASTRewrite rewrite, ImportRewrite importRewrite) throws CoreException { |
| AST ast= rewrite.getAST(); |
| if (fCastType != null) { |
| if (fCastType instanceof ITypeBinding) { |
| return importRewrite.addImport((ITypeBinding) fCastType, ast); |
| } else { |
| String string= importRewrite.addImport((String) fCastType); |
| return ASTNodeFactory.newType(ast, string); |
| } |
| } |
| |
| ASTNode node= fNodeToCast; |
| ASTNode parent= node.getParent(); |
| if (parent instanceof CastExpression) { |
| node= parent; |
| parent= parent.getParent(); |
| } |
| while (parent instanceof ParenthesizedExpression) { |
| node= parent; |
| parent= parent.getParent(); |
| } |
| if (parent instanceof MethodInvocation) { |
| MethodInvocation invocation= (MethodInvocation) node.getParent(); |
| if (invocation.getExpression() == node) { |
| IBinding targetContext= ASTResolving.getParentMethodOrTypeBinding(node); |
| ITypeBinding[] bindings= ASTResolving.getQualifierGuess(node.getRoot(), invocation.getName().getIdentifier(), invocation.arguments(), targetContext); |
| if (bindings.length > 0) { |
| ITypeBinding first= getCastFavorite(bindings, fNodeToCast.resolveTypeBinding()); |
| |
| Type newTypeNode= importRewrite.addImport(first, ast); |
| addLinkedPosition(rewrite.track(newTypeNode), true, "casttype"); //$NON-NLS-1$ |
| for (int i= 0; i < bindings.length; i++) { |
| addLinkedPositionProposal("casttype", bindings[i]); //$NON-NLS-1$ |
| } |
| return newTypeNode; |
| } |
| } |
| } |
| Type newCastType= ast.newSimpleType(ast.newSimpleName("Object")); //$NON-NLS-1$ |
| addLinkedPosition(rewrite.track(newCastType), true, "casttype"); //$NON-NLS-1$ |
| return newCastType; |
| } |
| |
| private ITypeBinding getCastFavorite(ITypeBinding[] suggestedCasts, ITypeBinding nodeToCastBinding) { |
| if (nodeToCastBinding == null) { |
| return suggestedCasts[0]; |
| } |
| ITypeBinding favourite= suggestedCasts[0]; |
| for (int i = 0; i < suggestedCasts.length; i++) { |
| ITypeBinding curr= suggestedCasts[i]; |
| if (nodeToCastBinding.isCastCompatible(curr)) { |
| return curr; |
| } |
| if (curr.isInterface()) { |
| favourite= curr; |
| } |
| } |
| return favourite; |
| } |
| |
| |
| protected ASTRewrite getRewrite() throws CoreException { |
| AST ast= fNodeToCast.getAST(); |
| ASTRewrite rewrite= ASTRewrite.create(ast); |
| ImportRewrite importRewrite= createImportRewrite((CompilationUnit) fNodeToCast.getRoot()); |
| |
| Type newTypeNode= getNewCastTypeNode(rewrite, importRewrite); |
| |
| if (fNodeToCast.getNodeType() == ASTNode.CAST_EXPRESSION) { |
| CastExpression expression= (CastExpression) fNodeToCast; |
| rewrite.replace(expression.getType(), newTypeNode, null); |
| } else { |
| Expression expressionCopy= (Expression) rewrite.createCopyTarget(fNodeToCast); |
| if (needsInnerParantheses(fNodeToCast)) { |
| ParenthesizedExpression parenthesizedExpression= ast.newParenthesizedExpression(); |
| parenthesizedExpression.setExpression(expressionCopy); |
| expressionCopy= parenthesizedExpression; |
| } |
| |
| CastExpression castExpression= ast.newCastExpression(); |
| castExpression.setExpression(expressionCopy); |
| castExpression.setType(newTypeNode); |
| |
| ASTNode replacingNode= castExpression; |
| if (needsOuterParantheses(fNodeToCast)) { |
| ParenthesizedExpression parenthesizedExpression= ast.newParenthesizedExpression(); |
| parenthesizedExpression.setExpression(castExpression); |
| replacingNode= parenthesizedExpression; |
| } |
| |
| rewrite.replace(fNodeToCast, replacingNode, null); |
| } |
| return rewrite; |
| } |
| |
| private static boolean needsInnerParantheses(ASTNode nodeToCast) { |
| int nodeType= nodeToCast.getNodeType(); |
| |
| // nodes have weaker precedence than cast |
| return nodeType == ASTNode.INFIX_EXPRESSION || nodeType == ASTNode.CONDITIONAL_EXPRESSION |
| || nodeType == ASTNode.ASSIGNMENT || nodeType == ASTNode.INSTANCEOF_EXPRESSION; |
| } |
| |
| private static boolean needsOuterParantheses(ASTNode nodeToCast) { |
| ASTNode parent= nodeToCast.getParent(); |
| if (parent instanceof MethodInvocation) { |
| if (((MethodInvocation)parent).getExpression() == nodeToCast) { |
| return true; |
| } |
| } else if (parent instanceof QualifiedName) { |
| if (((QualifiedName)parent).getQualifier() == nodeToCast) { |
| return true; |
| } |
| } else if (parent instanceof FieldAccess) { |
| if (((FieldAccess)parent).getExpression() == nodeToCast) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| |
| } |