/*******************************************************************************
* Copyright (c) 2000, 2008 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.wst.jsdt.internal.corext.refactoring.structure;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import org.eclipse.wst.jsdt.core.IJavaScriptProject;
import org.eclipse.wst.jsdt.core.dom.ASTNode;
import org.eclipse.wst.jsdt.core.dom.ASTVisitor;
import org.eclipse.wst.jsdt.core.dom.JavaScriptUnit;
import org.eclipse.wst.jsdt.core.dom.IBinding;
import org.eclipse.wst.jsdt.core.dom.IFunctionBinding;
import org.eclipse.wst.jsdt.core.dom.ITypeBinding;
import org.eclipse.wst.jsdt.core.dom.IVariableBinding;
import org.eclipse.wst.jsdt.core.dom.QualifiedName;
import org.eclipse.wst.jsdt.core.dom.QualifiedType;
import org.eclipse.wst.jsdt.core.dom.SimpleName;
import org.eclipse.wst.jsdt.core.dom.Type;
import org.eclipse.wst.jsdt.core.dom.rewrite.ImportRewrite;
import org.eclipse.wst.jsdt.internal.corext.codemanipulation.ImportReferencesCollector;
import org.eclipse.wst.jsdt.internal.corext.dom.Bindings;
public class ImportRemover {
private static class StaticImportData {
private boolean fField;
private String fMember;
private String fQualifier;
private StaticImportData(String qualifier, String member, boolean field) {
fQualifier= qualifier;
fMember= member;
fField= field;
}
}
private Set/* <String> */fAddedImports= new HashSet();
private Set/* <StaticImportData> */fAddedStaticImports= new HashSet();
private final IJavaScriptProject fProject;
private List/* <ASTNode> */fRemovedNodes= new ArrayList();
private final JavaScriptUnit fRoot;
public ImportRemover(IJavaScriptProject project, JavaScriptUnit root) {
fProject= project;
fRoot= root;
}
private void divideTypeRefs(List/* <SimpleName> */importNames, List/* <SimpleName> */staticNames, List/* <SimpleName> */removedRefs, List/* <SimpleName> */unremovedRefs) {
int[] removedStartsEnds= new int[2 * fRemovedNodes.size()];
for (int index= 0; index < fRemovedNodes.size(); index++) {
ASTNode node= (ASTNode) fRemovedNodes.get(index);
int start= node.getStartPosition();
removedStartsEnds[2 * index]= start;
removedStartsEnds[2 * index + 1]= start + node.getLength();
}
for (Iterator iterator= importNames.iterator(); iterator.hasNext();) {
SimpleName name= (SimpleName) iterator.next();
if (isInRemoved(name, removedStartsEnds))
removedRefs.add(name);
else
unremovedRefs.add(name);
}
for (Iterator iterator= staticNames.iterator(); iterator.hasNext();) {
SimpleName name= (SimpleName) iterator.next();
if (isInRemoved(name, removedStartsEnds))
removedRefs.add(name);
else
unremovedRefs.add(name);
}
}
public IBinding[] getImportsToRemove() {
ArrayList/* <SimpleName> */importNames= new ArrayList();
ArrayList/* <SimpleName> */staticNames= new ArrayList();
fRoot.accept(new ImportReferencesCollector(fProject, null, importNames, staticNames));
List/* <SimpleName> */removedRefs= new ArrayList();
List/* <SimpleName> */unremovedRefs= new ArrayList();
divideTypeRefs(importNames, staticNames, removedRefs, unremovedRefs);
if (removedRefs.size() == 0)
return new IBinding[0];
HashMap/* <String, IBinding> */potentialRemoves= getPotentialRemoves(removedRefs);
for (Iterator iterator= unremovedRefs.iterator(); iterator.hasNext();) {
SimpleName name= (SimpleName) iterator.next();
potentialRemoves.remove(name.getIdentifier());
}
Collection importsToRemove= potentialRemoves.values();
return (IBinding[]) importsToRemove.toArray(new IBinding[importsToRemove.size()]);
}
private HashMap getPotentialRemoves(List removedRefs) {
HashMap/* <String, IBinding> */potentialRemoves= new HashMap();
for (Iterator iterator= removedRefs.iterator(); iterator.hasNext();) {
SimpleName name= (SimpleName) iterator.next();
if (fAddedImports.contains(name.getIdentifier()) || hasAddedStaticImport(name))
continue;
IBinding binding= name.resolveBinding();
if (binding != null)
potentialRemoves.put(name.getIdentifier(), binding);
}
return potentialRemoves;
}
private boolean hasAddedStaticImport(SimpleName name) {
IBinding binding= name.resolveBinding();
if (binding instanceof IVariableBinding) {
IVariableBinding variable= (IVariableBinding) binding;
return hasAddedStaticImport(variable.getDeclaringClass().getQualifiedName(), variable.getName(), true);
} else if (binding instanceof IFunctionBinding) {
IFunctionBinding method= (IFunctionBinding) binding;
return hasAddedStaticImport(method.getDeclaringClass().getQualifiedName(), method.getName(), false);
}
return false;
}
private boolean hasAddedStaticImport(String qualifier, String member, boolean field) {
StaticImportData data= null;
for (final Iterator iterator= fAddedStaticImports.iterator(); iterator.hasNext();) {
data= (StaticImportData) iterator.next();
if (data.fQualifier.equals(qualifier) && data.fMember.equals(member) && data.fField == field)
return true;
}
return false;
}
public boolean hasRemovedNodes() {
return fRemovedNodes.size() != 0;
}
private boolean isInRemoved(SimpleName ref, int[] removedStartsEnds) {
int start= ref.getStartPosition();
int end= start + ref.getLength();
for (int index= 0; index < removedStartsEnds.length; index+= 2) {
if (start >= removedStartsEnds[index] && end <= removedStartsEnds[index + 1])
return true;
}
return false;
}
public void registerAddedImport(String typeName) {
int dot= typeName.lastIndexOf('.');
if (dot == -1)
fAddedImports.add(typeName);
else
fAddedImports.add(typeName.substring(dot + 1));
}
public void registerAddedImports(Type newTypeNode) {
newTypeNode.accept(new ASTVisitor(true) {
private void addName(SimpleName name) {
fAddedImports.add(name.getIdentifier());
}
public boolean visit(QualifiedName node) {
addName(node.getName());
return false;
}
public boolean visit(QualifiedType node) {
addName(node.getName());
return false;
}
public boolean visit(SimpleName node) {
addName(node);
return false;
}
});
}
public void registerAddedStaticImport(String qualifier, String member, boolean field) {
fAddedStaticImports.add(new StaticImportData(qualifier, member, field));
}
public void registerAddedStaticImport(IBinding binding) {
if (binding instanceof IVariableBinding) {
ITypeBinding declaringType= ((IVariableBinding) binding).getDeclaringClass();
fAddedStaticImports.add(new StaticImportData(Bindings.getRawQualifiedName(declaringType), binding.getName(), true));
} else if (binding instanceof IFunctionBinding) {
ITypeBinding declaringType= ((IFunctionBinding) binding).getDeclaringClass();
fAddedStaticImports.add(new StaticImportData(Bindings.getRawQualifiedName(declaringType), binding.getName(), false));
} else {
throw new IllegalArgumentException(binding.toString());
}
}
public void registerRemovedNode(ASTNode removed) {
fRemovedNodes.add(removed);
}
public void applyRemoves(ImportRewrite importRewrite) {
IBinding[] bindings= getImportsToRemove();
for (int i= 0; i < bindings.length; i++) {
if (bindings[i] instanceof ITypeBinding) {
ITypeBinding typeBinding= (ITypeBinding) bindings[i];
importRewrite.removeImport(typeBinding.getTypeDeclaration().getQualifiedName());
} else if (bindings[i] instanceof IFunctionBinding) {
IFunctionBinding binding= (IFunctionBinding) bindings[i];
importRewrite.removeStaticImport(binding.getDeclaringClass().getQualifiedName() + '.' + binding.getName());
} else if (bindings[i] instanceof IVariableBinding) {
IVariableBinding binding= (IVariableBinding) bindings[i];
importRewrite.removeStaticImport(binding.getDeclaringClass().getQualifiedName() + '.' + binding.getName());
}
}
}
}