+++ /dev/null
-/*
- * Copyright (C) 2008 Google Inc.
- *
- * 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);
- }
- }
-}
projects / unical.git / blobdiff