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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Eclipse Public License, Version 1.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.eclipse.org/org/documents/epl-v10.php
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.ide.eclipse.adt.internal.resources;
import com.android.annotations.Nullable;
import com.android.ide.eclipse.adt.internal.editors.layout.gle2.IncludeFinder;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.jface.dialogs.IInputValidator;
import java.util.Collection;
/** A validator which checks for cyclic dependencies */
public class CyclicDependencyValidator implements IInputValidator {
private final Collection<String> mInvalidIds;
private CyclicDependencyValidator(Collection<String> invalid) {
this.mInvalidIds = invalid;
}
@Override
public String isValid(String newText) {
if (mInvalidIds.contains(newText)) {
return "Cyclic include, not valid";
}
return null;
}
/**
* Creates a validator which ensures that the chosen id is not for a layout that is
* directly or indirectly including the given layout. Used to avoid cyclic
* dependencies when offering layouts to be included within a given file, etc.
*
* @param file the target file that candidate layouts should not directly or
* indirectly include
* @return a validator which checks whether resource ids are valid or whether they
* could result in a cyclic dependency
*/
@Nullable
public static IInputValidator create(@Nullable IFile file) {
if (file == null) {
return null;
}
IProject project = file.getProject();
IncludeFinder includeFinder = IncludeFinder.get(project);
final Collection<String> invalid =
includeFinder.getInvalidIncludes(file);
return new CyclicDependencyValidator(invalid);
}
}
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