com.github.gv2011.hprops.Converter.java Source code

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Here is the source code for com.github.gv2011.hprops.Converter.java

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package com.github.gv2011.hprops;

/*-
 * #%L
 * Hprops
 * %%
 * Copyright (C) 2016 - 2017 Vinz (https://github.com/gv2011)
 * %%
 * 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.
 * #L%
 */

import static com.github.gv2011.util.ex.Exceptions.call;

import java.io.Reader;
import java.io.StringReader;
import java.util.Properties;
import java.util.function.Consumer;

import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;

public class Converter {

    public Properties toProperties(final String json) {
        return toProperties(new StringReader(json));
    }

    public Properties toProperties(final Reader json) {
        final Properties result = new Properties();
        toProperties(new JsonReader(json), (p) -> result.setProperty(p.key(), p.value()));
        return result;
    }

    private void toProperties(final JsonReader json, final Consumer<Property> target) {
        final JsonToken t = call(json::peek);
        dispatchTop(json, target, t, "");
    }

    private void doObject(final JsonReader json, final Consumer<Property> target, final String prefix) {
        call(json::beginObject);
        JsonToken t = call(json::peek);
        while (!t.equals(JsonToken.END_OBJECT)) {
            final String key = (prefix.isEmpty() ? "" : prefix + ".") + encodeKey(call(json::nextName));
            t = call(json::peek);
            dispatch(json, target, t, key);
            t = call(json::peek);
        }
        call(json::endObject);
    }

    private void dispatchTop(final JsonReader json, final Consumer<Property> target, final JsonToken t,
            final String key) {
        if (t.equals(JsonToken.BEGIN_OBJECT))
            doObject(json, target, key);
        else if (t.equals(JsonToken.BEGIN_ARRAY))
            doList(json, target, key);
        else
            throw new IllegalArgumentException(t.toString());
    }

    private void dispatch(final JsonReader json, final Consumer<Property> target, final JsonToken t,
            final String key) {
        if (t.equals(JsonToken.BOOLEAN))
            write(target, key, getBoolean(json));
        else if (t.equals(JsonToken.STRING))
            write(target, key, getString(json));
        else if (t.equals(JsonToken.NUMBER))
            write(target, key, getNumber(json));
        else if (t.equals(JsonToken.BEGIN_OBJECT))
            doObject(json, target, key);
        else if (t.equals(JsonToken.BEGIN_ARRAY))
            doList(json, target, key);
        else if (t.equals(JsonToken.NULL))
            getNull(json);
        else
            throw new IllegalArgumentException(t.toString());
    }

    private void write(final Consumer<Property> target, final String key, final String value) {
        target.accept(new Property(key, value));
    }

    String encodeKey(final String key) {
        return key.replace("\\", "\\\\").replace(".", "\\.");
    }

    String decodeKey(final String key) {
        return key.replace("\\.", ".").replace("\\\\", "\\");
    }

    private void doList(final JsonReader json, final Consumer<Property> target, final String prefix) {
        call(json::beginArray);
        int i = 1;
        JsonToken t = call(json::peek);
        while (!t.equals(JsonToken.END_ARRAY)) {
            final String key = (prefix.isEmpty() ? "" : prefix + ".") + i;
            dispatch(json, target, t, key);
            i++;
            t = call(json::peek);
        }
        call(json::endArray);
    }

    private void getNull(final JsonReader json) {
        call(json::nextNull);
    }

    private String getNumber(final JsonReader json) {
        return call(json::nextString);
    }

    private String getString(final JsonReader json) {
        return call(json::nextString);
    }

    private String getBoolean(final JsonReader json) {
        return Boolean.toString(call(json::nextBoolean));
    }

}