/*
* =============================================================================
*
* Copyright (c) 2011-2016, The THYMELEAF team (http://www.thymeleaf.org)
*
* Licensed 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.thymeleaf.engine;
import java.io.IOException;
import java.io.Writer;
import org.thymeleaf.util.IWritableCharSequence;
/**
*
* @author Daniel Fernández
* @since 3.0.0
*
*/
abstract class AbstractTextualTemplateEvent extends AbstractTemplateEvent implements IEngineTemplateEvent {
private final CharSequence contentCharSeq;
private final String contentStr;
private final int contentLength;
private volatile String computedContentStr = null;
private volatile int computedContentLength = -1;
private volatile Boolean computedContentIsWhitespace = null;
private volatile Boolean computedContentIsInlineable = null;
AbstractTextualTemplateEvent(final CharSequence content) {
super();
this.contentCharSeq = content;
if (content != null && content instanceof String) {
this.contentStr = (String)content;
this.contentLength = content.length();
} else {
this.contentStr = null;
this.contentLength = -1;
}
}
AbstractTextualTemplateEvent(final CharSequence content, final String templateName, final int line, final int col) {
super(templateName, line, col);
this.contentCharSeq = content;
if (content != null && content instanceof String) {
this.contentStr = (String)content;
this.contentLength = content.length();
} else {
this.contentStr = null;
this.contentLength = -1;
}
}
protected final String getContentText() {
if (this.contentStr != null || this.contentCharSeq == null) {
return this.contentStr;
}
String t = this.computedContentStr;
if (t == null) {
this.computedContentStr = t = this.contentCharSeq.toString();
}
return t;
}
protected final int getContentLength() {
if (this.contentLength >= 0 || this.contentCharSeq == null) {
return this.contentLength;
}
int l = this.computedContentLength;
if (l < 0) {
this.computedContentLength = l = this.contentCharSeq.length();
}
return l;
}
protected final char charAtContent(final int index) {
// no need to perform index bounds checking: it would slow down traversing operations a lot, and
// it would be exactly the same exception we'd obtain by basically trying to access that index, so let's do
// it directly instead
if (this.contentStr != null) {
return this.contentStr.charAt(index);
}
if (this.computedContentStr != null) {
// Once the String is computed, this could be faster
return this.computedContentStr.charAt(index);
}
return this.contentCharSeq.charAt(index);
}
protected final CharSequence contentSubSequence(final int start, final int end) {
// no need to perform index bounds checking: it would slow down traversing operations a lot, and
// it would be exactly the same exception we'd obtain by basically trying to access that index, so let's do
// it directly instead
if (this.contentStr != null) {
return this.contentStr.subSequence(start, end);
}
if (this.computedContentStr != null) {
// Once the String is computed, this could be faster
return this.computedContentStr.subSequence(start, end);
}
return this.contentCharSeq.subSequence(start, end);
}
final boolean isWhitespace() {
Boolean w = this.computedContentIsWhitespace;
if (w == null) {
this.computedContentIsWhitespace = w = computeWhitespace();
}
return w.booleanValue();
}
final boolean isInlineable() {
Boolean i = this.computedContentIsInlineable;
if (i == null) {
this.computedContentIsInlineable = i = computeInlineable();
}
return i.booleanValue();
}
private Boolean computeWhitespace() {
int n = getContentLength(); // This will leave computedContentLength computed in case it's needed afterwards
if (n == 0) {
return Boolean.FALSE; // empty texts are NOT whitespace
}
char c;
while (n-- != 0) {
c = charAtContent(n);
if (c != ' ' && c != '\n') { // shortcut - most characters in many templates are just whitespace.
if (!Character.isWhitespace(c)) {
return Boolean.FALSE;
}
}
}
return Boolean.TRUE;
}
private Boolean computeInlineable() {
int n = getContentLength(); // This will leave computedContentLength computed in case it's needed afterwards
if (n == 0) {
return Boolean.FALSE;
}
char c0, c1;
c0 = 0x0;
int inline = 0;
while (n-- != 0) {
c1 = charAtContent(n);
if (n > 0 && c1 == ']' && c0 == ']') {
inline = 1;
n--;
c1 = charAtContent(n);
} else if (n > 0 && c1 == ')' && c0 == ']') {
inline = 2;
n--;
c1 = charAtContent(n);
} else if (inline == 1 && c1 == '[' && c0 == '[') {
return Boolean.TRUE;
} else if (inline == 2 && c1 == '[' && c0 == '(') {
return Boolean.TRUE;
}
c0 = c1;
}
return Boolean.FALSE;
}
public final void writeContent(final Writer writer) throws IOException {
if (this.contentStr != null) {
writer.write(this.contentStr);
} else if (this.computedContentStr != null) {
writer.write(this.computedContentStr);
} else if (this.contentCharSeq instanceof IWritableCharSequence) {
// In the special case we are using a writable CharSequence, we will avoid creating a String
// for the whole content
((IWritableCharSequence) this.contentCharSeq).write(writer);
} else {
writer.write(getContentText()); // We write, but make sure we cache the String we create
}
}
@Override
public String toString() {
return getContentText();
}
}