com.android.ide.common.resources.configuration.ResourceQualifier Maven / Gradle / Ivy
/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* 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.common.resources.configuration;
import com.android.annotations.NonNull;
import com.android.annotations.Nullable;
/**
* Base class for resource qualifiers.
*
* The resource qualifier classes are designed as immutable.
*/
public abstract class ResourceQualifier implements Comparable {
/**
* Returns the human readable name of the qualifier.
*/
public abstract String getName();
/**
* Returns a shorter human readable name for the qualifier.
*
* @see #getName()
*/
public abstract String getShortName();
/**
* Returns the API level when this qualifier was added to Android.
*/
public abstract int since();
/**
* Whether this qualifier is deprecated.
*/
public boolean deprecated() {
return false;
}
/**
* Returns whether the qualifier has a valid filter value.
*/
public abstract boolean isValid();
/**
* Returns whether the qualifier has a fake value.
*
* Fake values are used internally and should not be used as real qualifier value.
*/
public abstract boolean hasFakeValue();
/**
* Check if the value is valid for this qualifier, and if so sets the value into a Folder
* Configuration.
*
* @param value The value to check and set. Must not be null.
* @param config The folder configuration to receive the value. Must not be null.
* @return true if the value was valid and was set.
*/
public abstract boolean checkAndSet(String value, FolderConfiguration config);
/**
* Returns a string formatted to be used in a folder name.
*/
public abstract String getFolderSegment();
/**
* Returns the qualifier that can be used in {@link #isBetterMatchThan(ResourceQualifier,
* ResourceQualifier)} when no qualifier is present in the config.
*
* null has a special meaning when trying to match the best config (it's the worst qualifier,
* unless not other alternative matches). If a qualifier type has a different definition of best
* in regards to the null qualifier, this method should be subclassed and a special value should
* be returned from here, which can then be used to call {@link #isBetterMatchThan
* (ResourceQualifier, ResourceQualifier)} which can implement the custom logic.
*/
public ResourceQualifier getNullQualifier() {
return null;
}
/**
* Returns whether the given qualifier is a match for the receiver.
*
* The default implementation returns the result of {@link #equals(Object)}.
*
* Children class that re-implements this must implement {@link #isBetterMatchThan
* (ResourceQualifier, ResourceQualifier)} too.
*
* @param qualifier the reference qualifier
* @return true if the receiver is a match.
*/
public boolean isMatchFor(ResourceQualifier qualifier) {
return equals(qualifier);
}
/**
* Returns true if the receiver (this) is a better match for the given {@code reference} than
* the given {@code compareTo} comparable.
*
* @param compareTo The {@link ResourceQualifier} to compare to.
* @param reference The reference qualifier value for which the match is (from phone's
* folderConfig).
*/
public boolean isBetterMatchThan(@Nullable ResourceQualifier compareTo,
@NonNull ResourceQualifier reference) {
// the default is to always return false. This gives less overhead than always returning
// true, as it would only compare same values anyway.
return compareTo == null;
}
@Override
public String toString() {
return getFolderSegment();
}
/**
* Returns a string formatted for display purpose.
*/
public abstract String getShortDisplayValue();
/**
* Returns a string formatted for display purpose.
*/
public abstract String getLongDisplayValue();
/**
* Returns {@code true} if both objects are equal.
*
* This is declared as abstract to force children classes to implement it.
*/
@Override
public abstract boolean equals(Object object);
/**
* Returns a hash code value for the object.
*
* This is declared as abstract to force children classes to implement it.
*/
@Override
public abstract int hashCode();
@Override
public final int compareTo(@NonNull ResourceQualifier o) {
return toString().compareTo(o.toString());
}
public static boolean isValid(@Nullable ResourceQualifier qualifier) {
return qualifier != null && qualifier.isValid();
}
}