com.google.eclipse.protobuf.model.util.IndexRanges.java Source code

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Here is the source code for com.google.eclipse.protobuf.model.util.IndexRanges.java

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/*
 * Copyright (c) 2015 Google Inc.
 *
 * All rights reserved. This program and the accompanying materials are made available under the terms of the Eclipse
 * Public License v1.0 which accompanies this distribution, and is available at
 *
 * http://www.eclipse.org/legal/epl-v10.html
 */
package com.google.eclipse.protobuf.model.util;

import com.google.common.collect.Range;
import com.google.eclipse.protobuf.protobuf.IndexRange;
import com.google.eclipse.protobuf.services.ProtobufGrammarAccess;
import com.google.inject.Inject;
import com.google.inject.Singleton;

/**
 * Utility methods related to <code>{@link IndexRange}</code>.
 *
 * @author jogl@google.com (John Glassmyer)
 */
@Singleton
public class IndexRanges {
    /**
     * Thrown to indicate that a range's end number is less than its start number.
     */
    public static class BackwardsRangeException extends Exception {
        private static final long serialVersionUID = 1L;
    }

    private ProtobufGrammarAccess protobufGrammarAccess;

    @Inject
    IndexRanges(ProtobufGrammarAccess protobufGrammarAccess) {
        this.protobufGrammarAccess = protobufGrammarAccess;
    }

    /**
     * @throws BackwardsRangeException if the end number is less than the start number
     */
    public Range<Long> toLongRange(IndexRange indexRange) throws BackwardsRangeException {
        long from = indexRange.getFrom();

        Range<Long> range;
        String toString = indexRange.getTo();
        if (toString == null) {
            range = Range.singleton(from);
        } else if (toString.equals(getMaxKeyword())) {
            range = Range.atLeast(from);
        } else {
            Long to = Long.valueOf(toString);

            if (to < from) {
                throw new BackwardsRangeException();
            }

            range = Range.closed(from, to);
        }

        return range;
    }

    public String getMaxKeyword() {
        return protobufGrammarAccess.getIndexRangeMaxAccess().getMaxKeyword_1().getValue();
    }
}