/*
* 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.sling.scripting.core.impl.helper;
import java.io.IOException;
import java.io.Writer;
import javax.servlet.ServletResponse;
class OnDemandWriter extends Writer {
private final ServletResponse response;
private Writer delegatee;
OnDemandWriter(ServletResponse response) {
this.response = response;
}
private Writer getWriter() throws IOException {
if (delegatee == null) {
delegatee = response.getWriter();
}
return delegatee;
}
@Override
public void write(int c) throws IOException {
synchronized (lock) {
getWriter().write(c);
}
}
@Override
public void write(char[] cbuf) throws IOException {
synchronized (lock) {
getWriter().write(cbuf);
}
}
@Override
public void write(char[] cbuf, int off, int len) throws IOException {
synchronized (lock) {
getWriter().write(cbuf, off, len);
}
}
@Override
public void write(String str) throws IOException {
synchronized (lock) {
getWriter().write(str);
}
}
@Override
public void write(String str, int off, int len) throws IOException {
synchronized (lock) {
getWriter().write(str, off, len);
}
}
@Override
public void flush() throws IOException {
synchronized (lock) {
Writer writer = delegatee;
if (writer != null) {
writer.flush();
}
}
}
@Override
public void close() throws IOException {
synchronized (lock) {
// flush and close the delegatee if existing, otherwise ignore
Writer writer = delegatee;
if (writer != null) {
writer.flush();
writer.close();
// drop the delegatee now
delegatee = null;
}
}
}
}