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BufferedJsonGenerator.java
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BufferedJsonGenerator.java
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/**
* Copyright (C) 2020 Czech Technical University in Prague
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.jsonld.serialization.util;
import cz.cvut.kbss.jsonld.serialization.JsonGenerator;
import java.util.Stack;
public class BufferedJsonGenerator implements JsonGenerator {
private StringBuilder buffer = new StringBuilder();
private boolean firstElement = true;
private boolean firstAttribute = true;
private final Stack<NodeType> nodes = new Stack<>();
private enum NodeType {
ARRAY, OBJECT
}
@Override
public void writeFieldName(String name) {
if (!firstAttribute) {
buffer.append(',');
}
firstAttribute = false;
buffer.append('\"').append(name).append("\":");
}
@Override
public void writeObjectStart() {
if (!nodes.isEmpty() && nodes.peek() == NodeType.ARRAY) {
if (!firstElement) {
buffer.append(',');
}
this.firstElement = false;
}
buffer.append('{');
nodes.push(NodeType.OBJECT);
this.firstAttribute = true;
}
@Override
public void writeObjectEnd() {
buffer.append('}');
nodes.pop();
}
@Override
public void writeArrayStart() {
buffer.append('[');
this.firstElement = true;
nodes.push(NodeType.ARRAY);
}
@Override
public void writeArrayEnd() {
buffer.append(']');
nodes.pop();
}
@Override
public void writeNumber(Number number) {
if (!nodes.isEmpty() && nodes.peek() == NodeType.ARRAY) {
if (!firstElement) {
buffer.append(',');
}
this.firstElement = false;
}
buffer.append(number);
}
@Override
public void writeBoolean(boolean value) {
if (!nodes.isEmpty() && nodes.peek() == NodeType.ARRAY) {
if (!firstElement) {
buffer.append(',');
}
this.firstElement = false;
}
buffer.append(value);
}
@Override
public void writeNull() {
if (!nodes.isEmpty() && nodes.peek() == NodeType.ARRAY) {
if (!firstElement) {
buffer.append(',');
}
this.firstElement = false;
}
buffer.append("null");
}
@Override
public void writeString(String text) {
if (!nodes.isEmpty() && nodes.peek() == NodeType.ARRAY) {
if (!firstElement) {
buffer.append(',');
}
this.firstElement = false;
}
buffer.append('\"').append(text).append('\"');
}
public String getResult() {
return buffer.toString();
}
}