org.linkedin.util.json.jackson.JacksonPrettyPrinter.java Source code

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Here is the source code for org.linkedin.util.json.jackson.JacksonPrettyPrinter.java

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/*
 * Copyright (c) 2012 Yan Pujante
 *
 * 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.linkedin.util.json.jackson;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.PrettyPrinter;
import com.fasterxml.jackson.core.util.DefaultPrettyPrinter;

import java.io.IOException;

/**
 * Handles indentation levels + tighten output slightly
 *
 * @author yan@pongasoft.com
 */
public class JacksonPrettyPrinter implements PrettyPrinter {
    public static final DefaultPrettyPrinter.Indenter LF_2_SPACES_INDENTER = new DefaultPrettyPrinter.Lf2SpacesIndenter();

    private final DefaultPrettyPrinter.Indenter _indenter;
    private int _nesting = 0;

    public JacksonPrettyPrinter(int indent) {
        super();
        if (indent == 2)
            _indenter = LF_2_SPACES_INDENTER;
        else
            _indenter = new LfNSpacesIndenter(indent);
    }

    @Override
    public void writeRootValueSeparator(JsonGenerator jg) throws IOException {
    }

    private void writeIndentation(JsonGenerator jg) throws IOException {
        _indenter.writeIndentation(jg, _nesting);
    }

    @Override
    public void writeStartObject(JsonGenerator jg) throws IOException {
        jg.writeRaw('{');
        _nesting++;
    }

    @Override
    public void writeEndObject(JsonGenerator jg, int nrOfEntries) throws IOException {
        _nesting--;
        writeIndentation(jg);
        jg.writeRaw('}');
    }

    @Override
    public void writeObjectEntrySeparator(JsonGenerator jg) throws IOException {
        jg.writeRaw(',');
        writeIndentation(jg);
    }

    @Override
    public void writeObjectFieldValueSeparator(JsonGenerator jg) throws IOException {
        jg.writeRaw(": ");
    }

    @Override
    public void writeStartArray(JsonGenerator jg) throws IOException {
        jg.writeRaw('[');
        _nesting++;
    }

    @Override
    public void writeEndArray(JsonGenerator jg, int nrOfValues) throws IOException {
        _nesting--;
        writeIndentation(jg);
        jg.writeRaw(']');
    }

    @Override
    public void writeArrayValueSeparator(JsonGenerator jg) throws IOException {
        jg.writeRaw(',');
        writeIndentation(jg);
    }

    @Override
    public void beforeArrayValues(JsonGenerator jg) throws IOException {
        writeIndentation(jg);
    }

    @Override
    public void beforeObjectEntries(JsonGenerator jg) throws IOException {
        writeIndentation(jg);
    }
}