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diff --git a/gson/com/google/gson/JsonElement.java b/gson/com/google/gson/JsonElement.java
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+/*
+ * 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);
+    }
+  }
+}