/*******************************************************************************
* Copyright (c) 2000, 2011 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.che.ide.ext.java.jdt.internal.corext.refactoring.structure;
import org.eclipse.che.ide.ext.java.jdt.core.dom.ASTNode;
import org.eclipse.che.ide.ext.java.jdt.core.dom.ASTVisitor;
import org.eclipse.che.ide.ext.java.jdt.core.dom.CompilationUnit;
import org.eclipse.che.ide.ext.java.jdt.core.dom.IBinding;
import org.eclipse.che.ide.ext.java.jdt.core.dom.IMethodBinding;
import org.eclipse.che.ide.ext.java.jdt.core.dom.ITypeBinding;
import org.eclipse.che.ide.ext.java.jdt.core.dom.IVariableBinding;
import org.eclipse.che.ide.ext.java.jdt.core.dom.ImportDeclaration;
import org.eclipse.che.ide.ext.java.jdt.core.dom.Name;
import org.eclipse.che.ide.ext.java.jdt.core.dom.QualifiedName;
import org.eclipse.che.ide.ext.java.jdt.core.dom.QualifiedType;
import org.eclipse.che.ide.ext.java.jdt.core.dom.SimpleName;
import org.eclipse.che.ide.ext.java.jdt.core.dom.Type;
import org.eclipse.che.ide.ext.java.jdt.core.dom.rewrite.ImportRewrite;
import org.eclipse.che.ide.ext.java.jdt.internal.corext.codemanipulation.ImportReferencesCollector;
import org.eclipse.che.ide.ext.java.jdt.internal.corext.dom.Bindings;
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;
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<String>();
private Set<StaticImportData> fAddedStaticImports = new HashSet<StaticImportData>();
private List<ASTNode> fRemovedNodes = new ArrayList<ASTNode>();
private List<ImportDeclaration> fInlinedStaticImports = new ArrayList<ImportDeclaration>();
private final CompilationUnit fRoot;
public ImportRemover(CompilationUnit root) {
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 = fRemovedNodes.get(index);
int start = node.getStartPosition();
removedStartsEnds[2 * index] = start;
removedStartsEnds[2 * index + 1] = start + node.getLength();
}
for (Iterator<SimpleName> iterator = importNames.iterator(); iterator.hasNext(); ) {
SimpleName name = iterator.next();
if (isInRemoved(name, removedStartsEnds))
removedRefs.add(name);
else
unremovedRefs.add(name);
}
for (Iterator<SimpleName> iterator = staticNames.iterator(); iterator.hasNext(); ) {
SimpleName name = iterator.next();
if (isInRemoved(name, removedStartsEnds))
removedRefs.add(name);
else
unremovedRefs.add(name);
}
for (Iterator<ImportDeclaration> iterator = fInlinedStaticImports.iterator(); iterator.hasNext(); ) {
ImportDeclaration importDecl = iterator.next();
Name name = importDecl.getName();
if (name instanceof QualifiedName)
name = ((QualifiedName)name).getName();
removedRefs.add((SimpleName)name);
}
}
public IBinding[] getImportsToRemove() {
ArrayList<SimpleName> importNames = new ArrayList<SimpleName>();
ArrayList<SimpleName> staticNames = new ArrayList<SimpleName>();
ImportReferencesCollector.collect(fRoot, null, importNames, staticNames);
List<SimpleName> removedRefs = new ArrayList<SimpleName>();
List<SimpleName> unremovedRefs = new ArrayList<SimpleName>();
divideTypeRefs(importNames, staticNames, removedRefs, unremovedRefs);
if (removedRefs.size() == 0)
return new IBinding[0];
HashMap<String, IBinding> potentialRemoves = getPotentialRemoves(removedRefs);
for (Iterator<SimpleName> iterator = unremovedRefs.iterator(); iterator.hasNext(); ) {
SimpleName name = iterator.next();
potentialRemoves.remove(name.getIdentifier());
}
Collection<IBinding> importsToRemove = potentialRemoves.values();
return importsToRemove.toArray(new IBinding[importsToRemove.size()]);
}
private HashMap<String, IBinding> getPotentialRemoves(List<SimpleName> removedRefs) {
HashMap<String, IBinding> potentialRemoves = new HashMap<String, IBinding>();
for (Iterator<SimpleName> iterator = removedRefs.iterator(); iterator.hasNext(); ) {
SimpleName name = 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 IMethodBinding) {
IMethodBinding method = (IMethodBinding)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<StaticImportData> iterator = fAddedStaticImports.iterator(); iterator.hasNext(); ) {
data = 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 || fInlinedStaticImports.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());
}
@Override
public boolean visit(QualifiedName node) {
addName(node.getName());
return false;
}
@Override
public boolean visit(QualifiedType node) {
addName(node.getName());
return false;
}
@Override
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 IMethodBinding) {
ITypeBinding declaringType = ((IMethodBinding)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 IMethodBinding) {
IMethodBinding binding = (IMethodBinding)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());
}
}
}
public void registerInlinedStaticImport(ImportDeclaration importDecl) {
fInlinedStaticImports.add(importDecl);
}
}