org.springframework.ide.vscode.commons.languageserver.util.Settings.java Source code

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Here is the source code for org.springframework.ide.vscode.commons.languageserver.util.Settings.java

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/*******************************************************************************
 * Copyright (c) 2016-2017 Pivotal, Inc.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Pivotal, Inc. - initial API and implementation
 *******************************************************************************/
package org.springframework.ide.vscode.commons.languageserver.util;

import java.util.Set;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.collect.ImmutableSet;
import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;

/**
 * Convenience wrapper around a 'settings' object. Provides some useful accessor methods to
 * retrieve properties from the settings object.
 */
public class Settings {

    private static final Logger log = LoggerFactory.getLogger(Settings.class);

    private JsonElement settings;

    private Gson gson;

    public Settings(JsonElement settings) {
        this.settings = settings;
    }

    public <T> T getAs(Class<T> type, String... names) {
        JsonElement json = getRawProperty(names);
        if (json != null) {
            return gson().fromJson(json, type);
        }
        return null;
    }

    private Gson gson() {
        if (gson == null) {
            gson = new Gson();
        }
        return gson;
    }

    public Set<String> getStringSet(String... names) {
        ImmutableSet.Builder<String> strings = ImmutableSet.builder();
        try {
            JsonElement val = getRawProperty(names);
            if (val != null) {
                JsonArray array = val.getAsJsonArray();
                for (JsonElement el : array) {
                    try {
                        strings.add(el.getAsString());
                    } catch (Exception e) {
                        log.error("", e);
                    }
                }
            }
        } catch (Exception e) {
            log.error("", e);
        }
        return strings.build();
    }

    public Integer getInt(String... names) {
        try {
            JsonElement val = getRawProperty(names);
            if (val != null) {
                return val.getAsInt();
            }
        } catch (Exception e) {
            log.error("", e);
        }
        return null;
    }

    public String getString(String... names) {
        try {
            JsonElement val = getRawProperty(names);
            if (val != null) {
                return val.getAsString();
            }
        } catch (Exception e) {
            log.error("", e);
        }
        return null;
    }

    public Boolean getBoolean(String... names) {
        try {
            JsonElement val = getRawProperty(names);
            if (val != null) {
                return val.getAsBoolean();
            }
        } catch (Exception e) {
            log.error("", e);
        }
        return null;
    }

    public JsonElement getRawProperty(String... names) {
        return getRawProperty(settings, names, 0);
    }

    public JsonElement getRawSettings() {
        return settings;
    }

    private static JsonElement getRawProperty(JsonElement settings, String[] names, int i) {
        if (i >= names.length) {
            return settings;
        } else if (settings instanceof JsonObject) {
            JsonElement sub = ((JsonObject) settings).get(names[i]);
            return getRawProperty(sub, names, i + 1);
        } else {
            return null;
        }
    }

    @Override
    public String toString() {
        return settings.toString();
    }

}