134 lines
3.6 KiB
Java
134 lines
3.6 KiB
Java
/*
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* Copyright (C) 2008 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.gson;
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import java.io.PrintWriter;
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/**
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* Formats Json in a compact way eliminating all unnecessary whitespace.
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*
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* @author Inderjeet Singh
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*/
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final class JsonCompactFormatter implements JsonFormatter {
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private static class FormattingVisitor implements JsonElementVisitor {
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private final PrintWriter writer;
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private final boolean serializeNulls;
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FormattingVisitor(PrintWriter writer, boolean serializeNulls) {
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this.writer = writer;
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this.serializeNulls = serializeNulls;
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}
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public void visitPrimitive(JsonPrimitive primitive) {
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writer.append(primitive.toString());
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}
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public void visitNull() {
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writer.append("null");
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}
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public void startArray(JsonArray array) {
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writer.append('[');
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}
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public void visitArrayMember(JsonArray parent, JsonPrimitive member, boolean isFirst) {
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if (!isFirst) {
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writer.append(',');
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}
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writer.append(member.toString());
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}
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public void visitArrayMember(JsonArray parent, JsonArray member, boolean isFirst) {
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if (!isFirst) {
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writer.append(',');
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}
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}
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public void visitArrayMember(JsonArray parent, JsonObject member, boolean isFirst) {
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if (!isFirst) {
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writer.append(',');
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}
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}
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public void visitNullArrayMember(JsonArray parent, boolean isFirst) {
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if (!isFirst) {
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writer.append(',');
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}
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}
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public void endArray(JsonArray array) {
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writer.append(']');
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}
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public void startObject(JsonObject object) {
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writer.append('{');
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}
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public void visitObjectMember(JsonObject parent, String memberName, JsonPrimitive member,
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boolean isFirst) {
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if (!isFirst) {
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writer.append(',');
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}
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writer.append('"');
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writer.append(memberName);
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writer.append("\":");
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writer.append(member.toString());
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}
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public void visitObjectMember(JsonObject parent, String memberName, JsonArray member,
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boolean isFirst) {
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if (!isFirst) {
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writer.append(',');
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}
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writer.append('"');
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writer.append(memberName);
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writer.append("\":");
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}
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public void visitObjectMember(JsonObject parent, String memberName, JsonObject member,
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boolean isFirst) {
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if (!isFirst) {
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writer.append(',');
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}
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writer.append('"');
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writer.append(memberName);
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writer.append("\":");
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}
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public void visitNullObjectMember(JsonObject parent, String memberName, boolean isFirst) {
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if (serializeNulls) {
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visitObjectMember(parent, memberName, (JsonObject) null, isFirst);
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}
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}
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public void endObject(JsonObject object) {
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writer.append('}');
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}
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}
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public void format(JsonElement root, PrintWriter writer, boolean serializeNulls) {
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if (root == null) {
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return;
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}
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JsonElementVisitor visitor =
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new JsonEscapingVisitor(new FormattingVisitor(writer, serializeNulls));
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JsonTreeNavigator navigator = new JsonTreeNavigator(visitor, serializeNulls);
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navigator.navigate(root);
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}
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}
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