org.apache.jackrabbit.oak.exporter.CNDStreamWriter Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.jackrabbit.oak.exporter;
import java.io.Closeable;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Set;
import org.apache.jackrabbit.guava.common.base.Strings;
import org.apache.jackrabbit.guava.common.collect.ImmutableSet;
import org.apache.jackrabbit.oak.commons.json.JsopBuilder;
import org.apache.jackrabbit.oak.commons.json.JsopWriter;
import static org.apache.jackrabbit.guava.common.base.Preconditions.checkNotNull;
import static org.apache.jackrabbit.guava.common.base.Preconditions.checkState;
/**
* Writes nodes in CND format
*
*
* + projects
* - jcr:primaryType = "sling:OrderedFolder"
* - jcr:mixinTypes = ["rep:AccessControllable"]
* - jcr:createdBy = "admin"
* - jcr:created = "2017-01-26T08:02:08.602+05:30"
* - sling:resourceType = "sling/projects"
* + rep:policy
* - jcr:primaryType = "rep:ACL"
*
*/
class CNDStreamWriter implements JsopWriter, Closeable {
private static final Set COMMON_TYPE_CODES = ImmutableSet.of("nam:", "dat:");
private enum State {NONE, STARTED, BEGIN, END}
private final PrintWriter w;
private State arrayState = State.NONE;
private int depth = 0;
private String deferredName;
private String indent = " ";
public CNDStreamWriter(PrintWriter w) {
this.w = w;
}
@Override
public JsopWriter object() {
if (deferredName != null) {
w.println();
space();
w.print('+');
w.print(' ');
w.print(deferredName);
deferredName = null;
}
depth++;
return this;
}
@Override
public JsopWriter endObject() {
optionalResetArrayState();
depth--;
return this;
}
@Override
public JsopWriter array() {
checkState(arrayState == State.NONE);
optionalKey();
arrayState = State.BEGIN;
w.append('[');
return this;
}
@Override
public JsopWriter endArray() {
checkState(arrayState == State.BEGIN || arrayState == State.STARTED);
arrayState = State.END;
w.append(']');
return this;
}
@Override
public JsopWriter key(String key) {
optionalResetArrayState();
deferredName = key;
return this;
}
@Override
public JsopWriter encodedValue(String raw) {
optionalKey();
optionalComma();
w.print(raw);
optionalChangeArrayState();
return this;
}
@Override
public JsopWriter value(String value) {
return encodedValue(JsopBuilder.encode(stripTypeCode(value)));
}
@Override
public JsopWriter value(long x) {
return encodedValue(String.valueOf(x));
}
@Override
public JsopWriter value(boolean b) {
return encodedValue(String.valueOf(b));
}
@Override
public void close() throws IOException {
checkState(depth == 0);
}
private void optionalComma() {
if (arrayState == State.STARTED) {
w.print(',');
}
}
private void optionalChangeArrayState() {
if (arrayState == State.BEGIN) {
arrayState = State.STARTED;
}
}
private void optionalKey() {
if (arrayState == State.BEGIN || arrayState == State.STARTED) {
return;
}
checkNotNull(deferredName);
w.println();
space();
w.print('-');
w.print(' ');
w.print(deferredName);
w.print(" = ");
deferredName = null;
}
private void space() {
w.print(Strings.repeat(indent, depth));
}
private void optionalResetArrayState() {
//Check that not within array
checkState(arrayState == State.END || arrayState == State.NONE);
if (arrayState == State.END) {
arrayState = State.NONE;
}
}
private static String stripTypeCode(String value) {
if (value != null) {
for (String code : COMMON_TYPE_CODES){
if (value.startsWith(code)){
return value.substring(code.length());
}
}
}
return value;
}
//Unsupported operation. These are also not used by JsonSerializer
@Override
public JsopWriter tag(char tag) {
throw new UnsupportedOperationException();
}
@Override
public JsopWriter append(JsopWriter diff) {
throw new UnsupportedOperationException();
}
@Override
public JsopWriter newline() {
throw new UnsupportedOperationException();
}
@Override
public void resetWriter() {
throw new UnsupportedOperationException();
}
@Override
public void setLineLength(int length) {
throw new UnsupportedOperationException();
}
}
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