com.google.gerrit.server.util.LabelVote.java Source code

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Here is the source code for com.google.gerrit.server.util.LabelVote.java

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// Copyright (C) 2013 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.google.gerrit.server.util;

import static com.google.common.base.Preconditions.checkArgument;

import com.google.auto.value.AutoValue;
import com.google.common.base.Strings;
import com.google.gerrit.common.data.LabelType;
import com.google.gerrit.reviewdb.client.PatchSetApproval;

/** A single vote on a label, consisting of a label name and a value. */
@AutoValue
public abstract class LabelVote {
    public static LabelVote parse(String text) {
        checkArgument(!Strings.isNullOrEmpty(text), "Empty label vote");
        if (text.charAt(0) == '-') {
            return create(text.substring(1), (short) 0);
        }
        short sign = 0;
        int i;
        for (i = text.length() - 1; i >= 0; i--) {
            int c = text.charAt(i);
            if (c == '-') {
                sign = (short) -1;
                break;
            } else if (c == '+') {
                sign = (short) 1;
                break;
            } else if (!('0' <= c && c <= '9')) {
                break;
            }
        }
        if (sign == 0) {
            return create(text, (short) 1);
        }
        return create(text.substring(0, i), (short) (sign * Short.parseShort(text.substring(i + 1))));
    }

    public static LabelVote parseWithEquals(String text) {
        checkArgument(!Strings.isNullOrEmpty(text), "Empty label vote");
        int e = text.lastIndexOf('=');
        checkArgument(e >= 0, "Label vote missing '=': %s", text);
        return create(text.substring(0, e), Short.parseShort(text.substring(e + 1), text.length()));
    }

    public static StringBuilder appendTo(StringBuilder sb, String label, short value) {
        if (value == (short) 0) {
            return sb.append('-').append(label);
        } else if (value < 0) {
            return sb.append(label).append(value);
        }
        return sb.append(label).append('+').append(value);
    }

    public static LabelVote create(String label, short value) {
        return new AutoValue_LabelVote(LabelType.checkNameInternal(label), value);
    }

    public static LabelVote create(PatchSetApproval psa) {
        return create(psa.getLabel(), psa.getValue());
    }

    public abstract String label();

    public abstract short value();

    public String format() {
        // Max short string length is "-32768".length() == 6.
        return appendTo(new StringBuilder(label().length() + 6), label(), value()).toString();
    }

    public String formatWithEquals() {
        if (value() <= (short) 0) {
            return label() + '=' + value();
        }
        return label() + "=+" + value();
    }

    @Override
    public String toString() {
        return format();
    }
}