init
This commit is contained in:
597
java/org/apache/jasper/runtime/JspWriterImpl.java
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597
java/org/apache/jasper/runtime/JspWriterImpl.java
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
|
||||
* contributor license agreements. See the NOTICE file distributed with
|
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
|
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* the License. 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 org.apache.jasper.runtime;
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import java.io.IOException;
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import java.io.Writer;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import javax.servlet.ServletResponse;
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import javax.servlet.jsp.JspWriter;
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import org.apache.jasper.Constants;
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import org.apache.jasper.compiler.Localizer;
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import org.apache.jasper.security.SecurityUtil;
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/**
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* Write text to a character-output stream, buffering characters so as
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* to provide for the efficient writing of single characters, arrays,
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* and strings.
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*
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* Provide support for discarding for the output that has been
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* buffered.
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*
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* This needs revisiting when the buffering problems in the JSP spec
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* are fixed -akv
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*
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* @author Anil K. Vijendran
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*/
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public class JspWriterImpl extends JspWriter {
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private Writer out;
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private ServletResponse response;
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private char cb[];
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private int nextChar;
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private boolean flushed = false;
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private boolean closed = false;
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public JspWriterImpl() {
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super( Constants.DEFAULT_BUFFER_SIZE, true );
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}
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/**
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* Create a new buffered character-output stream that uses an output
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* buffer of the given size.
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*
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* @param response A Servlet Response
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* @param sz Output-buffer size, a positive integer
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* @param autoFlush <code>true</code> to automatically flush on buffer
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* full, <code>false</code> to throw an overflow exception in that case
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* @exception IllegalArgumentException If sz is <= 0
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*/
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public JspWriterImpl(ServletResponse response, int sz,
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boolean autoFlush) {
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super(sz, autoFlush);
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if (sz < 0)
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throw new IllegalArgumentException("Buffer size <= 0");
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this.response = response;
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cb = sz == 0 ? null : new char[sz];
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nextChar = 0;
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}
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void init( ServletResponse response, int sz, boolean autoFlush ) {
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this.response= response;
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if( sz > 0 && ( cb == null || sz > cb.length ) )
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cb=new char[sz];
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nextChar = 0;
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this.autoFlush=autoFlush;
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this.bufferSize=sz;
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}
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/**
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* Package-level access
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*/
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void recycle() {
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flushed = false;
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closed = false;
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out = null;
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nextChar = 0;
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response = null;
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}
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/**
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* Flush the output buffer to the underlying character stream, without
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* flushing the stream itself. This method is non-private only so that it
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* may be invoked by PrintStream.
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* @throws IOException Error writing buffered data
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*/
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protected final void flushBuffer() throws IOException {
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if (bufferSize == 0)
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return;
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flushed = true;
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ensureOpen();
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if (nextChar == 0)
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return;
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initOut();
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out.write(cb, 0, nextChar);
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nextChar = 0;
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}
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private void initOut() throws IOException {
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if (out == null) {
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out = response.getWriter();
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}
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}
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private String getLocalizeMessage(final String message){
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if (SecurityUtil.isPackageProtectionEnabled()){
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return AccessController.doPrivileged(new PrivilegedAction<String>(){
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@Override
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public String run(){
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return Localizer.getMessage(message);
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}
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});
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} else {
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return Localizer.getMessage(message);
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}
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}
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/**
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* Discard the output buffer.
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*/
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@Override
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public final void clear() throws IOException {
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if ((bufferSize == 0) && (out != null))
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// clear() is illegal after any unbuffered output (JSP.5.5)
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throw new IllegalStateException(
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getLocalizeMessage("jsp.error.ise_on_clear"));
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if (flushed)
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throw new IOException(
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getLocalizeMessage("jsp.error.attempt_to_clear_flushed_buffer"));
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ensureOpen();
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nextChar = 0;
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}
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@Override
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public void clearBuffer() throws IOException {
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if (bufferSize == 0)
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throw new IllegalStateException(
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getLocalizeMessage("jsp.error.ise_on_clear"));
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ensureOpen();
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nextChar = 0;
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}
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private final void bufferOverflow() throws IOException {
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throw new IOException(getLocalizeMessage("jsp.error.overflow"));
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}
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/**
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* Flush the stream.
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*
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*/
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@Override
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public void flush() throws IOException {
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flushBuffer();
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if (out != null) {
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out.flush();
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}
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}
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/**
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* Close the stream.
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*
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*/
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@Override
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public void close() throws IOException {
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if (response == null || closed)
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// multiple calls to close is OK
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return;
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flush();
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if (out != null)
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out.close();
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out = null;
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closed = true;
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}
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/**
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* @return the number of bytes unused in the buffer
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*/
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@Override
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public int getRemaining() {
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return bufferSize - nextChar;
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}
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/** check to make sure that the stream has not been closed */
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private void ensureOpen() throws IOException {
|
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if (response == null || closed)
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throw new IOException("Stream closed");
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}
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/**
|
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* Write a single character.
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*/
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@Override
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public void write(int c) throws IOException {
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ensureOpen();
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if (bufferSize == 0) {
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initOut();
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out.write(c);
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}
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else {
|
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if (nextChar >= bufferSize)
|
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if (autoFlush)
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flushBuffer();
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else
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bufferOverflow();
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cb[nextChar++] = (char) c;
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}
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}
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/**
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* Our own little min method, to avoid loading java.lang.Math if we've run
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* out of file descriptors and we're trying to print a stack trace.
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*/
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private static int min(int a, int b) {
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if (a < b) return a;
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return b;
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}
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/**
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* Write a portion of an array of characters.
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*
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* <p> Ordinarily this method stores characters from the given array into
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* this stream's buffer, flushing the buffer to the underlying stream as
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* needed. If the requested length is at least as large as the buffer,
|
||||
* however, then this method will flush the buffer and write the characters
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||||
* directly to the underlying stream. Thus redundant
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||||
* <code>DiscardableBufferedWriter</code>s will not copy data unnecessarily.
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*
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* @param cbuf A character array
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* @param off Offset from which to start reading characters
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* @param len Number of characters to write
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*/
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@Override
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public void write(char cbuf[], int off, int len)
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throws IOException
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{
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ensureOpen();
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|
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if (bufferSize == 0) {
|
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initOut();
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out.write(cbuf, off, len);
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return;
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}
|
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|
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if ((off < 0) || (off > cbuf.length) || (len < 0) ||
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((off + len) > cbuf.length) || ((off + len) < 0)) {
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throw new IndexOutOfBoundsException();
|
||||
} else if (len == 0) {
|
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return;
|
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}
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|
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if (len >= bufferSize) {
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/* If the request length exceeds the size of the output buffer,
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flush the buffer and then write the data directly. In this
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way buffered streams will cascade harmlessly. */
|
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if (autoFlush)
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flushBuffer();
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else
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bufferOverflow();
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initOut();
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out.write(cbuf, off, len);
|
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return;
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}
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|
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int b = off, t = off + len;
|
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while (b < t) {
|
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int d = min(bufferSize - nextChar, t - b);
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System.arraycopy(cbuf, b, cb, nextChar, d);
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b += d;
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nextChar += d;
|
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if (nextChar >= bufferSize)
|
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if (autoFlush)
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flushBuffer();
|
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else
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bufferOverflow();
|
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}
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|
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}
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/**
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* Write an array of characters. This method cannot be inherited from the
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* Writer class because it must suppress I/O exceptions.
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*/
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@Override
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public void write(char buf[]) throws IOException {
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write(buf, 0, buf.length);
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}
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|
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/**
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* Write a portion of a String.
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*
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* @param s String to be written
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* @param off Offset from which to start reading characters
|
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* @param len Number of characters to be written
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*/
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@Override
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public void write(String s, int off, int len) throws IOException {
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ensureOpen();
|
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if (bufferSize == 0) {
|
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initOut();
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out.write(s, off, len);
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return;
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||||
}
|
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int b = off, t = off + len;
|
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while (b < t) {
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int d = min(bufferSize - nextChar, t - b);
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s.getChars(b, b + d, cb, nextChar);
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b += d;
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nextChar += d;
|
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if (nextChar >= bufferSize)
|
||||
if (autoFlush)
|
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flushBuffer();
|
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else
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bufferOverflow();
|
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}
|
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}
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/**
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* Write a line separator. The line separator string is defined by the
|
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* system property <code>line.separator</code>, and is not necessarily a
|
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* single newline ('\n') character.
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*
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* @exception IOException If an I/O error occurs
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*/
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@Override
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public void newLine() throws IOException {
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write(System.lineSeparator());
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}
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||||
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/* Methods that do not terminate lines */
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/**
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* Print a boolean value. The string produced by <code>{@link
|
||||
* java.lang.String#valueOf(boolean)}</code> is translated into bytes
|
||||
* according to the platform's default character encoding, and these bytes
|
||||
* are written in exactly the manner of the <code>{@link
|
||||
* #write(int)}</code> method.
|
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*
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||||
* @param b The <code>boolean</code> to be printed
|
||||
*/
|
||||
@Override
|
||||
public void print(boolean b) throws IOException {
|
||||
write(b ? "true" : "false");
|
||||
}
|
||||
|
||||
/**
|
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* Print a character. The character is translated into one or more bytes
|
||||
* according to the platform's default character encoding, and these bytes
|
||||
* are written in exactly the manner of the <code>{@link
|
||||
* #write(int)}</code> method.
|
||||
*
|
||||
* @param c The <code>char</code> to be printed
|
||||
*/
|
||||
@Override
|
||||
public void print(char c) throws IOException {
|
||||
write(String.valueOf(c));
|
||||
}
|
||||
|
||||
/**
|
||||
* Print an integer. The string produced by <code>{@link
|
||||
* java.lang.String#valueOf(int)}</code> is translated into bytes according
|
||||
* to the platform's default character encoding, and these bytes are
|
||||
* written in exactly the manner of the <code>{@link #write(int)}</code>
|
||||
* method.
|
||||
*
|
||||
* @param i The <code>int</code> to be printed
|
||||
*/
|
||||
@Override
|
||||
public void print(int i) throws IOException {
|
||||
write(String.valueOf(i));
|
||||
}
|
||||
|
||||
/**
|
||||
* Print a long integer. The string produced by <code>{@link
|
||||
* java.lang.String#valueOf(long)}</code> is translated into bytes
|
||||
* according to the platform's default character encoding, and these bytes
|
||||
* are written in exactly the manner of the <code>{@link #write(int)}</code>
|
||||
* method.
|
||||
*
|
||||
* @param l The <code>long</code> to be printed
|
||||
*/
|
||||
@Override
|
||||
public void print(long l) throws IOException {
|
||||
write(String.valueOf(l));
|
||||
}
|
||||
|
||||
/**
|
||||
* Print a floating-point number. The string produced by <code>{@link
|
||||
* java.lang.String#valueOf(float)}</code> is translated into bytes
|
||||
* according to the platform's default character encoding, and these bytes
|
||||
* are written in exactly the manner of the <code>{@link #write(int)}</code>
|
||||
* method.
|
||||
*
|
||||
* @param f The <code>float</code> to be printed
|
||||
*/
|
||||
@Override
|
||||
public void print(float f) throws IOException {
|
||||
write(String.valueOf(f));
|
||||
}
|
||||
|
||||
/**
|
||||
* Print a double-precision floating-point number. The string produced by
|
||||
* <code>{@link java.lang.String#valueOf(double)}</code> is translated into
|
||||
* bytes according to the platform's default character encoding, and these
|
||||
* bytes are written in exactly the manner of the <code>{@link
|
||||
* #write(int)}</code> method.
|
||||
*
|
||||
* @param d The <code>double</code> to be printed
|
||||
*/
|
||||
@Override
|
||||
public void print(double d) throws IOException {
|
||||
write(String.valueOf(d));
|
||||
}
|
||||
|
||||
/**
|
||||
* Print an array of characters. The characters are converted into bytes
|
||||
* according to the platform's default character encoding, and these bytes
|
||||
* are written in exactly the manner of the <code>{@link #write(int)}</code>
|
||||
* method.
|
||||
*
|
||||
* @param s The array of chars to be printed
|
||||
*
|
||||
* @throws NullPointerException If <code>s</code> is <code>null</code>
|
||||
*/
|
||||
@Override
|
||||
public void print(char s[]) throws IOException {
|
||||
write(s);
|
||||
}
|
||||
|
||||
/**
|
||||
* Print a string. If the argument is <code>null</code> then the string
|
||||
* <code>"null"</code> is printed. Otherwise, the string's characters are
|
||||
* converted into bytes according to the platform's default character
|
||||
* encoding, and these bytes are written in exactly the manner of the
|
||||
* <code>{@link #write(int)}</code> method.
|
||||
*
|
||||
* @param s The <code>String</code> to be printed
|
||||
*/
|
||||
@Override
|
||||
public void print(String s) throws IOException {
|
||||
if (s == null) {
|
||||
s = "null";
|
||||
}
|
||||
write(s);
|
||||
}
|
||||
|
||||
/**
|
||||
* Print an object. The string produced by the <code>{@link
|
||||
* java.lang.String#valueOf(Object)}</code> method is translated into bytes
|
||||
* according to the platform's default character encoding, and these bytes
|
||||
* are written in exactly the manner of the <code>{@link #write(int)}</code>
|
||||
* method.
|
||||
*
|
||||
* @param obj The <code>Object</code> to be printed
|
||||
*/
|
||||
@Override
|
||||
public void print(Object obj) throws IOException {
|
||||
write(String.valueOf(obj));
|
||||
}
|
||||
|
||||
/* Methods that do terminate lines */
|
||||
|
||||
/**
|
||||
* Terminate the current line by writing the line separator string. The
|
||||
* line separator string is defined by the system property
|
||||
* <code>line.separator</code>, and is not necessarily a single newline
|
||||
* character (<code>'\n'</code>).
|
||||
*
|
||||
* Need to change this from PrintWriter because the default
|
||||
* println() writes to the sink directly instead of through the
|
||||
* write method...
|
||||
*/
|
||||
@Override
|
||||
public void println() throws IOException {
|
||||
newLine();
|
||||
}
|
||||
|
||||
/**
|
||||
* Print a boolean value and then terminate the line. This method behaves
|
||||
* as though it invokes <code>{@link #print(boolean)}</code> and then
|
||||
* <code>{@link #println()}</code>.
|
||||
*/
|
||||
@Override
|
||||
public void println(boolean x) throws IOException {
|
||||
print(x);
|
||||
println();
|
||||
}
|
||||
|
||||
/**
|
||||
* Print a character and then terminate the line. This method behaves as
|
||||
* though it invokes <code>{@link #print(char)}</code> and then <code>{@link
|
||||
* #println()}</code>.
|
||||
*/
|
||||
@Override
|
||||
public void println(char x) throws IOException {
|
||||
print(x);
|
||||
println();
|
||||
}
|
||||
|
||||
/**
|
||||
* Print an integer and then terminate the line. This method behaves as
|
||||
* though it invokes <code>{@link #print(int)}</code> and then <code>{@link
|
||||
* #println()}</code>.
|
||||
*/
|
||||
@Override
|
||||
public void println(int x) throws IOException {
|
||||
print(x);
|
||||
println();
|
||||
}
|
||||
|
||||
/**
|
||||
* Print a long integer and then terminate the line. This method behaves
|
||||
* as though it invokes <code>{@link #print(long)}</code> and then
|
||||
* <code>{@link #println()}</code>.
|
||||
*/
|
||||
@Override
|
||||
public void println(long x) throws IOException {
|
||||
print(x);
|
||||
println();
|
||||
}
|
||||
|
||||
/**
|
||||
* Print a floating-point number and then terminate the line. This method
|
||||
* behaves as though it invokes <code>{@link #print(float)}</code> and then
|
||||
* <code>{@link #println()}</code>.
|
||||
*/
|
||||
@Override
|
||||
public void println(float x) throws IOException {
|
||||
print(x);
|
||||
println();
|
||||
}
|
||||
|
||||
/**
|
||||
* Print a double-precision floating-point number and then terminate the
|
||||
* line. This method behaves as though it invokes <code>{@link
|
||||
* #print(double)}</code> and then <code>{@link #println()}</code>.
|
||||
*/
|
||||
@Override
|
||||
public void println(double x) throws IOException {
|
||||
print(x);
|
||||
println();
|
||||
}
|
||||
|
||||
/**
|
||||
* Print an array of characters and then terminate the line. This method
|
||||
* behaves as though it invokes <code>{@link #print(char[])}</code> and then
|
||||
* <code>{@link #println()}</code>.
|
||||
*/
|
||||
@Override
|
||||
public void println(char x[]) throws IOException {
|
||||
print(x);
|
||||
println();
|
||||
}
|
||||
|
||||
/**
|
||||
* Print a String and then terminate the line. This method behaves as
|
||||
* though it invokes <code>{@link #print(String)}</code> and then
|
||||
* <code>{@link #println()}</code>.
|
||||
*/
|
||||
@Override
|
||||
public void println(String x) throws IOException {
|
||||
print(x);
|
||||
println();
|
||||
}
|
||||
|
||||
/**
|
||||
* Print an Object and then terminate the line. This method behaves as
|
||||
* though it invokes <code>{@link #print(Object)}</code> and then
|
||||
* <code>{@link #println()}</code>.
|
||||
*/
|
||||
@Override
|
||||
public void println(Object x) throws IOException {
|
||||
print(x);
|
||||
println();
|
||||
}
|
||||
|
||||
}
|
||||
Reference in New Issue
Block a user