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/*
* Copyright 2011 the original author or authors.
*
* 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 org.gradle.internal.typeconversion;
import org.gradle.internal.Cast;
import org.gradle.internal.exceptions.DiagnosticsVisitor;
import org.gradle.util.GUtil;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;
/**
* Flattens or collectionizes input and passes the input notations to the delegates. Returns a set.
*/
public class FlatteningNotationParser implements NotationParser> {
private final NotationParser delegate;
public FlatteningNotationParser(NotationParser delegate) {
assert delegate != null : "delegate cannot be null";
this.delegate = delegate;
}
@Override
public void describe(DiagnosticsVisitor visitor) {
delegate.describe(visitor);
visitor.candidate("Collections or arrays of any other supported format. Nested collections/arrays will be flattened.");
}
@Override
public Set parseNotation(N notation) {
Collection notations = Cast.uncheckedNonnullCast(GUtil.collectionize(notation));
if (notations.isEmpty()) {
return Collections.emptySet();
}
if (notations.size() == 1) {
return Collections.singleton(delegate.parseNotation(notations.iterator().next()));
}
Set out = new LinkedHashSet();
for (N n : notations) {
out.add(delegate.parseNotation(n));
}
return out;
}
}