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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.config;
import java.io.File;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
/**
* An immutable file reference that can only be created from classes within the same package.
* This is to prevent clients from creating arbitrary and invalid file references.
*
* @author Tony Vaagenes
*/
public final class FileReference {
private final String value;
public FileReference(String value) {
Objects.requireNonNull(value);
this.value = value;
}
public String value() {
return value;
}
@Override
public int hashCode() {
return value.hashCode();
}
@Override
public boolean equals(Object other) {
return other instanceof FileReference &&
value.equals(((FileReference)other).value);
}
@Override
public String toString() {
return "file '" + value + "'";
}
public static List<String> toValues(Collection<FileReference> references) {
List<String> ret = new ArrayList<String>();
for (FileReference r: references) {
ret.add(r.value());
}
return ret;
}
public static Map<String, String> toValueMap(Map<String, FileReference> map) {
Map<String, String> ret = new LinkedHashMap<>();
for (Map.Entry<String, FileReference> e : map.entrySet()) {
ret.put(e.getKey(), e.getValue().value());
}
return ret;
}
public static FileReference mockFileReferenceForUnitTesting(File file) {
if (! file.exists())
throw new IllegalArgumentException("File '" + file.getAbsolutePath() + "' does not exist.");
return new FileReference(file.getPath());
}
}
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