Android Open Source - reflect-app Json Element






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Java Source Code

/*
 * Copyright (C) 2008 Google Inc./*from www .j  a va2  s  .  c om*/
 *
 * 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 com.google.gson;

import com.google.gson.internal.Streams;
import com.google.gson.stream.JsonWriter;
import java.io.IOException;
import java.io.StringWriter;
import java.math.BigDecimal;
import java.math.BigInteger;

/**
 * A class representing an element of Json. It could either be a {@link JsonObject}, a
 * {@link JsonArray}, a {@link JsonPrimitive} or a {@link JsonNull}.
 *
 * @author Inderjeet Singh
 * @author Joel Leitch
 */
public abstract class JsonElement {
  /**
   * Returns a deep copy of this element. Immutable elements like primitives
   * and nulls are not copied.
   */
  abstract JsonElement deepCopy();

  /**
   * provides check for verifying if this element is an array or not.
   *
   * @return true if this element is of type {@link JsonArray}, false otherwise.
   */
  public boolean isJsonArray() {
    return this instanceof JsonArray;
  }

  /**
   * provides check for verifying if this element is a Json object or not.
   *
   * @return true if this element is of type {@link JsonObject}, false otherwise.
   */
  public boolean isJsonObject() {
    return this instanceof JsonObject;
  }

  /**
   * provides check for verifying if this element is a primitive or not.
   *
   * @return true if this element is of type {@link JsonPrimitive}, false otherwise.
   */
  public boolean isJsonPrimitive() {
    return this instanceof JsonPrimitive;
  }

  /**
   * provides check for verifying if this element represents a null value or not.
   *
   * @return true if this element is of type {@link JsonNull}, false otherwise.
   * @since 1.2
   */
  public boolean isJsonNull() {
    return this instanceof JsonNull;
  }

  /**
   * convenience method to get this element as a {@link JsonObject}. If the element is of some
   * other type, a {@link ClassCastException} will result. Hence it is best to use this method
   * after ensuring that this element is of the desired type by calling {@link #isJsonObject()}
   * first.
   *
   * @return get this element as a {@link JsonObject}.
   * @throws IllegalStateException if the element is of another type.
   */
  public JsonObject getAsJsonObject() {
    if (isJsonObject()) {
      return (JsonObject) this;
    }
    throw new IllegalStateException("Not a JSON Object: " + this);
  }

  /**
   * convenience method to get this element as a {@link JsonArray}. If the element is of some
   * other type, a {@link ClassCastException} will result. Hence it is best to use this method
   * after ensuring that this element is of the desired type by calling {@link #isJsonArray()}
   * first.
   *
   * @return get this element as a {@link JsonArray}.
   * @throws IllegalStateException if the element is of another type.
   */
  public JsonArray getAsJsonArray() {
    if (isJsonArray()) {
      return (JsonArray) this;
    }
    throw new IllegalStateException("This is not a JSON Array.");
  }

  /**
   * convenience method to get this element as a {@link JsonPrimitive}. If the element is of some
   * other type, a {@link ClassCastException} will result. Hence it is best to use this method
   * after ensuring that this element is of the desired type by calling {@link #isJsonPrimitive()}
   * first.
   *
   * @return get this element as a {@link JsonPrimitive}.
   * @throws IllegalStateException if the element is of another type.
   */
  public JsonPrimitive getAsJsonPrimitive() {
    if (isJsonPrimitive()) {
      return (JsonPrimitive) this;
    }
    throw new IllegalStateException("This is not a JSON Primitive.");
  }

  /**
   * convenience method to get this element as a {@link JsonNull}. If the element is of some
   * other type, a {@link ClassCastException} will result. Hence it is best to use this method
   * after ensuring that this element is of the desired type by calling {@link #isJsonNull()}
   * first.
   *
   * @return get this element as a {@link JsonNull}.
   * @throws IllegalStateException if the element is of another type.
   * @since 1.2
   */
  public JsonNull getAsJsonNull() {
    if (isJsonNull()) {
      return (JsonNull) this;
    }
    throw new IllegalStateException("This is not a JSON Null.");
  }

  /**
   * convenience method to get this element as a boolean value.
   *
   * @return get this element as a primitive boolean value.
   * @throws ClassCastException if the element is of not a {@link JsonPrimitive} and is not a valid
   * boolean value.
   * @throws IllegalStateException if the element is of the type {@link JsonArray} but contains
   * more than a single element.
   */
  public boolean getAsBoolean() {
    throw new UnsupportedOperationException(getClass().getSimpleName());
  }

  /**
   * convenience method to get this element as a {@link Boolean} value.
   *
   * @return get this element as a {@link Boolean} value.
   * @throws ClassCastException if the element is of not a {@link JsonPrimitive} and is not a valid
   * boolean value.
   * @throws IllegalStateException if the element is of the type {@link JsonArray} but contains
   * more than a single element.
   */
  Boolean getAsBooleanWrapper() {
    throw new UnsupportedOperationException(getClass().getSimpleName());
  }

  /**
   * convenience method to get this element as a {@link Number}.
   *
   * @return get this element as a {@link Number}.
   * @throws ClassCastException if the element is of not a {@link JsonPrimitive} and is not a valid
   * number.
   * @throws IllegalStateException if the element is of the type {@link JsonArray} but contains
   * more than a single element.
   */
  public Number getAsNumber() {
    throw new UnsupportedOperationException(getClass().getSimpleName());
  }

  /**
   * convenience method to get this element as a string value.
   *
   * @return get this element as a string value.
   * @throws ClassCastException if the element is of not a {@link JsonPrimitive} and is not a valid
   * string value.
   * @throws IllegalStateException if the element is of the type {@link JsonArray} but contains
   * more than a single element.
   */
  public String getAsString() {
    throw new UnsupportedOperationException(getClass().getSimpleName());
  }

  /**
   * convenience method to get this element as a primitive double value.
   *
   * @return get this element as a primitive double value.
   * @throws ClassCastException if the element is of not a {@link JsonPrimitive} and is not a valid
   * double value.
   * @throws IllegalStateException if the element is of the type {@link JsonArray} but contains
   * more than a single element.
   */
  public double getAsDouble() {
    throw new UnsupportedOperationException(getClass().getSimpleName());
  }

  /**
   * convenience method to get this element as a primitive float value.
   *
   * @return get this element as a primitive float value.
   * @throws ClassCastException if the element is of not a {@link JsonPrimitive} and is not a valid
   * float value.
   * @throws IllegalStateException if the element is of the type {@link JsonArray} but contains
   * more than a single element.
   */
  public float getAsFloat() {
    throw new UnsupportedOperationException(getClass().getSimpleName());
  }

  /**
   * convenience method to get this element as a primitive long value.
   *
   * @return get this element as a primitive long value.
   * @throws ClassCastException if the element is of not a {@link JsonPrimitive} and is not a valid
   * long value.
   * @throws IllegalStateException if the element is of the type {@link JsonArray} but contains
   * more than a single element.
   */
  public long getAsLong() {
    throw new UnsupportedOperationException(getClass().getSimpleName());
  }

  /**
   * convenience method to get this element as a primitive integer value.
   *
   * @return get this element as a primitive integer value.
   * @throws ClassCastException if the element is of not a {@link JsonPrimitive} and is not a valid
   * integer value.
   * @throws IllegalStateException if the element is of the type {@link JsonArray} but contains
   * more than a single element.
   */
  public int getAsInt() {
    throw new UnsupportedOperationException(getClass().getSimpleName());
  }

  /**
   * convenience method to get this element as a primitive byte value.
   *
   * @return get this element as a primitive byte value.
   * @throws ClassCastException if the element is of not a {@link JsonPrimitive} and is not a valid
   * byte value.
   * @throws IllegalStateException if the element is of the type {@link JsonArray} but contains
   * more than a single element.
   * @since 1.3
   */
  public byte getAsByte() {
    throw new UnsupportedOperationException(getClass().getSimpleName());
  }

  /**
   * convenience method to get this element as a primitive character value.
   *
   * @return get this element as a primitive char value.
   * @throws ClassCastException if the element is of not a {@link JsonPrimitive} and is not a valid
   * char value.
   * @throws IllegalStateException if the element is of the type {@link JsonArray} but contains
   * more than a single element.
   * @since 1.3
   */
  public char getAsCharacter() {
    throw new UnsupportedOperationException(getClass().getSimpleName());
  }

  /**
   * convenience method to get this element as a {@link BigDecimal}.
   *
   * @return get this element as a {@link BigDecimal}.
   * @throws ClassCastException if the element is of not a {@link JsonPrimitive}.
   * * @throws NumberFormatException if the element is not a valid {@link BigDecimal}.
   * @throws IllegalStateException if the element is of the type {@link JsonArray} but contains
   * more than a single element.
   * @since 1.2
   */
  public BigDecimal getAsBigDecimal() {
    throw new UnsupportedOperationException(getClass().getSimpleName());
  }

  /**
   * convenience method to get this element as a {@link BigInteger}.
   *
   * @return get this element as a {@link BigInteger}.
   * @throws ClassCastException if the element is of not a {@link JsonPrimitive}.
   * @throws NumberFormatException if the element is not a valid {@link BigInteger}.
   * @throws IllegalStateException if the element is of the type {@link JsonArray} but contains
   * more than a single element.
   * @since 1.2
   */
  public BigInteger getAsBigInteger() {
    throw new UnsupportedOperationException(getClass().getSimpleName());
  }

  /**
   * convenience method to get this element as a primitive short value.
   *
   * @return get this element as a primitive short value.
   * @throws ClassCastException if the element is of not a {@link JsonPrimitive} and is not a valid
   * short value.
   * @throws IllegalStateException if the element is of the type {@link JsonArray} but contains
   * more than a single element.
   */
  public short getAsShort() {
    throw new UnsupportedOperationException(getClass().getSimpleName());
  }

  /**
   * Returns a String representation of this element.
   */
  @Override
  public String toString() {
    try {
      StringWriter stringWriter = new StringWriter();
      JsonWriter jsonWriter = new JsonWriter(stringWriter);
      jsonWriter.setLenient(true);
      Streams.write(this, jsonWriter);
      return stringWriter.toString();
    } catch (IOException e) {
      throw new AssertionError(e);
    }
  }
}




Java Source Code List

com.google.gson.DefaultDateTypeAdapter.java
com.google.gson.ExclusionStrategy.java
com.google.gson.FieldAttributes.java
com.google.gson.FieldNamingPolicy.java
com.google.gson.FieldNamingStrategy.java
com.google.gson.GsonBuilder.java
com.google.gson.Gson.java
com.google.gson.InstanceCreator.java
com.google.gson.JsonArray.java
com.google.gson.JsonDeserializationContext.java
com.google.gson.JsonDeserializer.java
com.google.gson.JsonElement.java
com.google.gson.JsonIOException.java
com.google.gson.JsonNull.java
com.google.gson.JsonObject.java
com.google.gson.JsonParseException.java
com.google.gson.JsonParser.java
com.google.gson.JsonPrimitive.java
com.google.gson.JsonSerializationContext.java
com.google.gson.JsonSerializer.java
com.google.gson.JsonStreamParser.java
com.google.gson.JsonSyntaxException.java
com.google.gson.LongSerializationPolicy.java
com.google.gson.TreeTypeAdapter.java
com.google.gson.TypeAdapterFactory.java
com.google.gson.TypeAdapter.java
com.google.gson.annotations.Expose.java
com.google.gson.annotations.SerializedName.java
com.google.gson.annotations.Since.java
com.google.gson.annotations.Until.java
com.google.gson.annotations.package-info.java
com.google.gson.internal.ConstructorConstructor.java
com.google.gson.internal.Excluder.java
com.google.gson.internal.JsonReaderInternalAccess.java
com.google.gson.internal.LazilyParsedNumber.java
com.google.gson.internal.LinkedHashTreeMap.java
com.google.gson.internal.ObjectConstructor.java
com.google.gson.internal.Primitives.java
com.google.gson.internal.Streams.java
com.google.gson.internal.UnsafeAllocator.java
com.google.gson.internal.$Gson$Preconditions.java
com.google.gson.internal.$Gson$Types.java
com.google.gson.internal.bind.ArrayTypeAdapter.java
com.google.gson.internal.bind.CollectionTypeAdapterFactory.java
com.google.gson.internal.bind.DateTypeAdapter.java
com.google.gson.internal.bind.JsonTreeReader.java
com.google.gson.internal.bind.JsonTreeWriter.java
com.google.gson.internal.bind.MapTypeAdapterFactory.java
com.google.gson.internal.bind.ObjectTypeAdapter.java
com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.java
com.google.gson.internal.bind.SqlDateTypeAdapter.java
com.google.gson.internal.bind.TimeTypeAdapter.java
com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.java
com.google.gson.internal.bind.TypeAdapters.java
com.google.gson.internal.package-info.java
com.google.gson.reflect.TypeToken.java
com.google.gson.reflect.package-info.java
com.google.gson.stream.JsonReader.java
com.google.gson.stream.JsonScope.java
com.google.gson.stream.JsonToken.java
com.google.gson.stream.JsonWriter.java
com.google.gson.stream.MalformedJsonException.java
com.google.gson.package-info.java
com.pontydysgu.data.Answer.java
com.pontydysgu.data.LoginData.java
com.pontydysgu.data.QuestionStack.java
com.pontydysgu.data.Question.java
com.pontydysgu.data.StackArray.java
com.pontydysgu.gui.StackArrayAdapter.java
com.pontydysgu.pontylearningapp.DataService.java
com.pontydysgu.pontylearningapp.Login.java
com.pontydysgu.pontylearningapp.QuestionCycle.java
com.pontydysgu.pontylearningapp.Stackoverview.java
com.pontydysgu.webio.GetWebRequest.java
com.pontydysgu.webio.LoginService.java
com.pontydysgu.webio.PontyService.java
com.pontydysgu.webio.RetrieveStacksCallback.java
com.pontydysgu.webio.RetrieveStacksTask.java
com.pontydysgu.webio.SubmitAnswerCallback.java
com.pontydysgu.webio.SubmitAnswerTask.java