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/*
* Copyright (C) 2011 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.internal.bind;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonNull;
import com.google.gson.JsonObject;
import com.google.gson.JsonPrimitive;
import com.google.gson.stream.JsonWriter;
import java.io.IOException;
import java.io.Writer;
import java.util.ArrayList;
import java.util.List;
/**
* This writer creates a JsonElement.
*/
public final class JsonTreeWriter extends JsonWriter {
private static final Writer UNWRITABLE_WRITER = new Writer() {
@Override public void write(char[] buffer, int offset, int counter) {
throw new AssertionError();
}
@Override public void flush() throws IOException {
throw new AssertionError();
}
@Override public void close() throws IOException {
throw new AssertionError();
}
};
/** Added to the top of the stack when this writer is closed to cause following ops to fail. */
private static final JsonPrimitive SENTINEL_CLOSED = new JsonPrimitive("closed");
/** The JsonElements and JsonArrays under modification, outermost to innermost. */
private final List<JsonElement> stack = new ArrayList<JsonElement>();
/** The name for the next JSON object value. If non-null, the top of the stack is a JsonObject. */
private String pendingName;
/** the JSON element constructed by this writer. */
private JsonElement product = JsonNull.INSTANCE; // TODO: is this really what we want?;
public JsonTreeWriter() {
super(UNWRITABLE_WRITER);
}
/**
* Returns the top level object produced by this writer.
*/
public JsonElement get() {
if (!stack.isEmpty()) {
throw new IllegalStateException("Expected one JSON element but was " + stack);
}
return product;
}
private JsonElement peek() {
return stack.get(stack.size() - 1);
}
private void put(JsonElement value) {
if (pendingName != null) {
if (!value.isJsonNull() || getSerializeNulls()) {
JsonObject object = (JsonObject) peek();
object.add(pendingName, value);
}
pendingName = null;
} else if (stack.isEmpty()) {
product = value;
} else {
JsonElement element = peek();
if (element instanceof JsonArray) {
((JsonArray) element).add(value);
} else {
throw new IllegalStateException();
}
}
}
@Override public JsonWriter beginArray() throws IOException {
JsonArray array = new JsonArray();
put(array);
stack.add(array);
return this;
}
@Override public JsonWriter endArray() throws IOException {
if (stack.isEmpty() || pendingName != null) {
throw new IllegalStateException();
}
JsonElement element = peek();
if (element instanceof JsonArray) {
stack.remove(stack.size() - 1);
return this;
}
throw new IllegalStateException();
}
@Override public JsonWriter beginObject() throws IOException {
JsonObject object = new JsonObject();
put(object);
stack.add(object);
return this;
}
@Override public JsonWriter endObject() throws IOException {
if (stack.isEmpty() || pendingName != null) {
throw new IllegalStateException();
}
JsonElement element = peek();
if (element instanceof JsonObject) {
stack.remove(stack.size() - 1);
return this;
}
throw new IllegalStateException();
}
@Override public JsonWriter name(String name) throws IOException {
if (stack.isEmpty() || pendingName != null) {
throw new IllegalStateException();
}
JsonElement element = peek();
if (element instanceof JsonObject) {
pendingName = name;
return this;
}
throw new IllegalStateException();
}
@Override public JsonWriter value(String value) throws IOException {
if (value == null) {
return nullValue();
}
put(new JsonPrimitive(value));
return this;
}
@Override public JsonWriter nullValue() throws IOException {
put(JsonNull.INSTANCE);
return this;
}
@Override public JsonWriter value(boolean value) throws IOException {
put(new JsonPrimitive(value));
return this;
}
@Override public JsonWriter value(double value) throws IOException {
if (!isLenient() && (Double.isNaN(value) || Double.isInfinite(value))) {
throw new IllegalArgumentException("JSON forbids NaN and infinities: " + value);
}
put(new JsonPrimitive(value));
return this;
}
@Override public JsonWriter value(long value) throws IOException {
put(new JsonPrimitive(value));
return this;
}
@Override public JsonWriter value(Number value) throws IOException {
if (value == null) {
return nullValue();
}
if (!isLenient()) {
double d = value.doubleValue();
if (Double.isNaN(d) || Double.isInfinite(d)) {
throw new IllegalArgumentException("JSON forbids NaN and infinities: " + value);
}
}
put(new JsonPrimitive(value));
return this;
}
@Override public void flush() throws IOException {
}
@Override public void close() throws IOException {
if (!stack.isEmpty()) {
throw new IOException("Incomplete document");
}
stack.add(SENTINEL_CLOSED);
}
}
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