src/main/java/org/yaml/snakeyaml/serializer/NumberAnchorGenerator.java

/**
 * Copyright (c) 2008, http://www.snakeyaml.org
 *
 * 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.yaml.snakeyaml.serializer;

import org.yaml.snakeyaml.nodes.Node;

import java.text.NumberFormat;

public class NumberAnchorGenerator implements AnchorGenerator {

    private int lastAnchorId = 0;

    public NumberAnchorGenerator(int lastAnchorId) {
        this.lastAnchorId = lastAnchorId;
    }

    public String nextAnchor(Node node) {
        this.lastAnchorId++;
        NumberFormat format = NumberFormat.getNumberInstance();
        format.setMinimumIntegerDigits(3);
        format.setMaximumFractionDigits(0);// issue 172
        format.setGroupingUsed(false);
        String anchorId = format.format(this.lastAnchorId);
        return "id" + anchorId;
    }
}