com.google.dart.compiler.ast.LibraryImport.java Source code

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Here is the source code for com.google.dart.compiler.ast.LibraryImport.java

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// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

package com.google.dart.compiler.ast;

import com.google.common.collect.Sets;

import java.util.List;
import java.util.Set;

/**
 * Information about import - prefix and {@link LibraryUnit}.
 */
public class LibraryImport {
    private final LibraryUnit library;
    private final String prefix;
    private final Set<String> showNames;
    private final Set<String> hideNames;

    public LibraryImport(LibraryUnit library, String prefix, List<ImportCombinator> combinators) {
        this.library = library;
        this.prefix = prefix;
        this.showNames = createCombinatorsSet(combinators, true);
        this.hideNames = createCombinatorsSet(combinators, false);
    }

    public LibraryUnit getLibrary() {
        return library;
    }

    public String getPrefix() {
        return prefix;
    }

    public boolean isVisible(String name) {
        if (hideNames.contains(name)) {
            return false;
        }
        if (!showNames.isEmpty()) {
            return showNames.contains(name);
        }
        return true;
    }

    private static Set<String> createCombinatorsSet(List<ImportCombinator> combinators, boolean show) {
        Set<String> result = Sets.newHashSet();
        for (ImportCombinator combinator : combinators) {
            // show
            if (show && combinator instanceof ImportShowCombinator) {
                ImportShowCombinator showCombinator = (ImportShowCombinator) combinator;
                for (DartIdentifier showName : showCombinator.getShownNames()) {
                    if (showName != null) {
                        result.add(showName.getName());
                    }
                }
            }
            // hide
            if (!show && combinator instanceof ImportHideCombinator) {
                ImportHideCombinator hideCombinator = (ImportHideCombinator) combinator;
                for (DartIdentifier hideName : hideCombinator.getHiddenNames()) {
                    if (hideName != null) {
                        result.add(hideName.getName());
                    }
                }
            }
        }
        return result;
    }
}