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ObjectPrettyWriter.java
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package org.json.write;
/*
Copyright (c) 2006 JSON.org
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
The Software shall be used for Good, not Evil.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
import org.json.JSONAppendable;
import org.json.JSONException;
import org.json.JSONString;
import java.io.IOException;
import java.util.HashSet;
import java.util.Set;
/**
* Writes a JSON Object in a pretty-printed format.
*
* @author JSON.org
* @version 2016-09-14
*/
final class ObjectPrettyWriter implements StructureWriter, IndentingWriter {
private final Set<String> keys = new HashSet<String>();
private String currentKey = null;
private boolean keyWritten = false;
private int indentFactor;
private int indent;
private char parentStructure;
ObjectPrettyWriter(int indentFactor, int indent) {
this.indentFactor = indentFactor;
this.indent = indent;
this.parentStructure = 'i';
}
ObjectPrettyWriter(StructureWriter parentWriter) {
if (parentWriter instanceof IndentingWriter) {
this.indentFactor = ((IndentingWriter) parentWriter).getIndentFactor();
this.indent = ((IndentingWriter) parentWriter).getIndent();
this.parentStructure = parentWriter.getStructureType();
} else {
this.parentStructure = 'i';
}
}
@Override
public void beginStructure(Appendable writer) throws JSONException {
try {
switch(parentStructure) {
case 'i':
WriterUtil.indent(indent, writer);
indent += indentFactor;
break;
case 'a':
writer.append('\n');
WriterUtil.indent(indent, writer);
indent += indentFactor;
break;
case 'o':
indent += indentFactor;
break;
}
writer.append('{');
} catch (IOException e) {
throw new JSONException(e);
}
}
@Override
public void key(String key, Appendable writer) throws JSONException {
if (key == null) {
throw new JSONException("Null key.");
}
if (keyWritten) {
throw new JSONException("Misplaced key.");
} else {
try {
if (!keys.add(key)) {
throw new JSONException("Duplicate key \"" + key + "\"");
}
if (currentKey != null) {
writer.append(",\n");
} else {
writer.append('\n');
}
WriterUtil.indent(indent, writer);
currentKey = key;
keyWritten = true;
WriterUtil.writeString(key, writer);
writer.append(": ");
} catch (IOException e) {
throw new JSONException(e);
}
}
}
@Override
public void subValue(Appendable writer) throws JSONException {
if (!keyWritten) {
throw new JSONException("Misplaced value.");
}
keyWritten = false;
}
@Override
public boolean simpleValue(Object value, Appendable writer) throws JSONException {
if (!keyWritten) {
throw new JSONException("Misplaced value.");
}
keyWritten = false;
WriterUtil.writeSimpleValue(value, writer);
return false;
}
@Override
public boolean jsonStringValue(JSONString value, Appendable writer) throws JSONException {
if (!keyWritten) {
throw new JSONException("Misplaced value.");
}
keyWritten = false;
try {
String o = value.toJSONString();
if ((o != null) && (o.length() > 0)) {
char c = o.charAt(0);
if(c == '[' || c == '{') {
writer.append('\n');
WriterUtil.indent(indent + indentFactor, writer);
}
writer.append(o);
} else {
WriterUtil.writeString(value.toString(), writer);
}
return false;
} catch(JSONException e) {
// Propagate directly, because JSONException is a RuntimeException
throw e;
} catch (IOException e) {
throw new JSONException(e);
} catch (RuntimeException e) {
throw new JSONException(e);
}
}
@Override
public boolean jsonAppendableValue(JSONAppendable value, Appendable writer) throws JSONException {
if (!keyWritten) {
throw new JSONException("Misplaced value.");
}
keyWritten = false;
try {
writer.append('\n');
WriterUtil.indent(indent + indentFactor, writer);
WriterUtil.writeJSONAppendable(value, writer);
return false;
} catch(IOException e) {
throw new JSONException(e);
}
}
@Override
public boolean nullValue(Appendable writer) throws JSONException {
if (!keyWritten) {
throw new JSONException("Misplaced value.");
}
keyWritten = false;
WriterUtil.writeNull(writer);
return false;
}
@Override
public boolean booleanValue(boolean value, Appendable writer) throws JSONException {
if (!keyWritten) {
throw new JSONException("Misplaced value.");
}
keyWritten = false;
WriterUtil.writeBoolean(value, writer);
return false;
}
@Override
public boolean doubleValue(double value, Appendable writer) throws JSONException {
if (!keyWritten) {
throw new JSONException("Misplaced value.");
}
keyWritten = false;
WriterUtil.writeDouble(value, writer);
return false;
}
@Override
public boolean longValue(long value, Appendable writer) throws JSONException {
if (!keyWritten) {
throw new JSONException("Misplaced value.");
}
keyWritten = false;
WriterUtil.writeLong(value, writer);
return false;
}
@Override
public boolean endStructure(Appendable writer) throws JSONException {
try {
indent -= indentFactor;
if (currentKey != null) {
writer.append('\n');
WriterUtil.indent(indent, writer);
}
writer.append('}');
return parentStructure == 'i';
} catch (IOException e) {
throw new JSONException(e);
}
}
@Override
public String getIdentifier() {
return (currentKey == null) ? null : currentKey;
}
@Override
public String toString() {
return String.valueOf(getIdentifier());
}
/**
* Returns {@code 'o'} to indicate a JSON Object.
*
* @return the type of this structure, as a char value
*/
@Override
public char getStructureType() {
return 'o';
}
public int getIndentFactor() {
return indentFactor;
}
public int getIndent() {
return indent;
}
}