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/*
* Copyright 2016 Google Inc. All Rights Reserved.
*
* 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.google.turbine.binder.lookup;
import com.google.common.collect.ImmutableList;
import com.google.errorprone.annotations.Immutable;
import com.google.turbine.tree.Tree.Ident;
import java.util.NoSuchElementException;
/**
* The key for a qualified name lookup; effectively an immutable iterator over parts of a qualified
* name.
*/
@Immutable
public class LookupKey {
private final ImmutableList<Ident> simpleNames;
public LookupKey(ImmutableList<Ident> simpleNames) {
this.simpleNames = simpleNames;
}
/** The first simple name in the qualified type name. */
public Ident first() {
return simpleNames.get(0);
}
boolean hasNext() {
return simpleNames.size() > 1;
}
/**
* A {@link LookupKey} with the first simple name removed.
*
* <p>Used when resolving qualified top-level names, e.g. {@code java.util.HashMap.Entry} might be
* resolved in the following stages, ending with a resolved class and a {@link LookupKey} for any
* remaining nested type names (which may not be canonical).
*
* <ul>
* <li>{@code ((PACKAGE java) (KEY util.HashMap.Entry))}
* <li>{@code ((PACKAGE java.util) (KEY HashMap.Entry))}
* <li>{@code ((CLASS java.util.HashMap) (KEY Entry))}
* </ul>
*/
public LookupKey rest() {
if (!hasNext()) {
throw new NoSuchElementException();
}
return new LookupKey(simpleNames.subList(1, simpleNames.size()));
}
/** The simple names of the type. */
public ImmutableList<Ident> simpleNames() {
return simpleNames;
}
}
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