org.qcert.runtime.RuntimeUtils.java Source code

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Here is the source code for org.qcert.runtime.RuntimeUtils.java

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/*
 * Copyright 2015-2016 IBM Corporation
 *
 * 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.qcert.runtime;

import java.util.*;

import com.google.gson.*;

public class RuntimeUtils {
    public static class CollectionBuilder<T> {
        public CollectionBuilder(Collection<T> coll) {
            this.base = coll;
        }

        public CollectionBuilder() {
            this.base = new ArrayList<T>();
        }

        public CollectionBuilder(int capacity) {
            this.base = new ArrayList<T>(capacity);
        }

        public CollectionBuilder<T> add(T obj) {
            base.add(obj);
            return this;
        }

        public Collection<T> result() {
            return base;
        }

        private Collection<T> base;
    }

    public static class JsonObjectBuilder {
        public JsonObjectBuilder() {
            this.base = new JsonObject();
        }

        public JsonObjectBuilder add(String str, JsonElement elem) {
            base.add(str, elem);
            return this;
        }

        public JsonObject toJsonObject() {
            return base;
        }

        private JsonObject base;
    }

    public static JsonArray createJsonArray(JsonElement... elems) {
        JsonArray arr = new JsonArray();
        for (JsonElement elem : elems) {
            arr.add(elem);
        }
        return arr;
    }

    private static JsonObject asRec(Object e) {
        return ((JsonObject) e);
    }

    public static boolean either(JsonElement obj) {
        final JsonObject rec = obj.getAsJsonObject();
        if (rec.has("left")) {
            return true;
        } else if (rec.has("right")) {
            return false;
        } else {
            throw new RuntimeException("RuntimeUtils.either: Expected an either, but got an " + obj);
        }
    }

    public static JsonElement toLeft(JsonElement obj) {
        return asRec(obj).get("left");
    }

    public static JsonElement toRight(JsonElement obj) {
        return asRec(obj).get("right");
    }

    public static JsonElement[] collAsArray(JsonArray coll) {
        final JsonElement[] arr = new JsonElement[coll.size()];
        for (int i = 0; i < coll.size(); i++) {
            final JsonElement elem = coll.get(i);
            arr[i] = elem;
        }
        return arr;
    }

    public static long asLong(JsonElement e) {
        return e.getAsLong();
    }

    public static boolean asBoolean(JsonElement e) {
        return e.getAsBoolean();
    }
}