io.github.lukehutch.fastclasspathscanner.json.JSONObject Maven / Gradle / Ivy

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Uber-fast, ultra-lightweight Java classpath scanner. Scans the classpath by parsing the classfile binary format directly rather than by using reflection. See https://github.com/lukehutch/fast-classpath-scanner
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/*
 * This file is part of FastClasspathScanner.
 *
 * Author: Luke Hutchison
 *
 * Hosted at: https://github.com/lukehutch/fast-classpath-scanner
 *
 * --
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2018 Luke Hutchison
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
 * documentation files (the "Software"), to deal in the Software without restriction, including without
 * limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
 * LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
 * EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
 * OR OTHER DEALINGS IN THE SOFTWARE.
 */
package io.github.lukehutch.fastclasspathscanner.json;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

/** An intermediate object in the (de)serialization process, representing a JSON Object. */
class JSONObject {
    /** Key/value mappings, in display order. */
    List> items;

    /** Object id for cross-references, if known. */
    CharSequence objectId;

    public JSONObject(final int sizeHint) {
        items = new ArrayList<>(sizeHint);
    }

    public JSONObject(final List> items) {
        this.items = items;
    }

    /** Serialize this JSONObject to a string. */
    void toJSONString(final Map, CharSequence> jsonReferenceToId,
            final boolean includeNullValuedFields, final int depth, final int indentWidth,
            final StringBuilder buf) {
        final boolean prettyPrint = indentWidth > 0;
        final int n = items.size();
        int numDisplayedFields;
        if (includeNullValuedFields) {
            numDisplayedFields = n;
        } else {
            numDisplayedFields = 0;
            for (int i = 0; i < n; i++) {
                if (items.get(i).getValue() != null) {
                    numDisplayedFields++;
                }
            }
        }
        if (objectId == null && numDisplayedFields == 0) {
            buf.append("{}");
        } else {
            buf.append(prettyPrint ? "{\n" : "{");
            if (objectId != null) {
                // id will be non-null if this object does not have an @Id field, but was referenced by
                // another object (need to include ID_TAG)
                if (prettyPrint) {
                    JSONUtils.indent(depth + 1, indentWidth, buf);
                }
                buf.append('"');
                buf.append(JSONUtils.ID_KEY);
                buf.append(prettyPrint ? "\": " : "\":");
                JSONSerializer.jsonValToJSONString(objectId, jsonReferenceToId, includeNullValuedFields, depth + 1,
                        indentWidth, buf);
                if (numDisplayedFields > 0) {
                    buf.append(',');
                }
                if (prettyPrint) {
                    buf.append('\n');
                }
            }
            for (int i = 0, j = 0; i < n; i++) {
                final Entry item = items.get(i);
                final Object val = item.getValue();
                if (val != null || includeNullValuedFields) {
                    final String key = item.getKey();
                    if (key == null) {
                        // Keys must be quoted, so the unquoted null value cannot be a key
                        // (Should not happen -- JSONParser.parseJSONObject checks for null keys)
                        throw new IllegalArgumentException("Cannot serialize JSON object with null key");
                    }
                    if (prettyPrint) {
                        JSONUtils.indent(depth + 1, indentWidth, buf);
                    }
                    buf.append('"');
                    JSONUtils.escapeJSONString(key, buf);
                    buf.append(prettyPrint ? "\": " : "\":");
                    JSONSerializer.jsonValToJSONString(val, jsonReferenceToId, includeNullValuedFields, depth + 1,
                            indentWidth, buf);
                    if (++j < numDisplayedFields) {
                        buf.append(',');
                    }
                    if (prettyPrint) {
                        buf.append('\n');
                    }
                }
            }
            if (prettyPrint) {
                JSONUtils.indent(depth, indentWidth, buf);
            }
            buf.append('}');
        }
    }
}