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A strong typed high performance Java Template engine with .Net Razor like syntax
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/*
* Copyright (C) 2013 The Rythm Engine project
* Gelin Luo
*
* 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 com.greenlaw110.rythm.utils;
import com.greenlaw110.rythm.exception.FastRuntimeException;
import com.greenlaw110.rythm.template.ITemplate;
/**
* This class defines a chained text/string builder
*
* @author luog
*/
public class TextBuilder implements Cloneable {
/**
* The internal buffer
*/
protected StringBuilder __buffer;
/**
* Return the internal buffer of the text builder.
* If the buffer of this instance is null then return
* the {@link #caller()} instance's buffer
*
* @return a StringBuilder
*/
public StringBuilder buffer() {
return null == __buffer ? __caller.buffer() : __buffer;
}
/**
* The caller text builder. It is always an {@link ITemplate} instance
*/
protected TextBuilder __caller;
/**
* Return the caller in {@link ITemplate} type
*
* @return a ITemplate
*/
protected ITemplate caller() {
return (ITemplate) __caller;
}
/**
* Alias of {@link #buffer()}
*
* @return buffer as {@link StringBuilder}
*/
public StringBuilder __getBuffer() {
return buffer();
}
/**
* Set the internal buffer to this instance or if the
* {@link #caller()} exists, to the caller instance
*
* @param buffer
*/
public void __setBuffer(StringBuilder buffer) {
if (null != __caller) ((TextBuilder) __caller).__setBuffer(buffer);
else __buffer = buffer;
}
/**
* Set the internal buffer to this instance
*
* @param buffer
*/
public void setSelfOut(StringBuilder buffer) {
__buffer = buffer;
}
/**
* Get the buffer out from this instance
*
* @return a StringBuilder
*/
public StringBuilder getSelfOut() {
return __buffer;
}
/**
* Construct a root text builder
*/
public TextBuilder() {
__buffer = new StringBuilder();
__caller = null;
}
/**
* Construct a chained text builder with a {@link #caller()} instance
*
* @param caller
*/
public TextBuilder(TextBuilder caller) {
this.__caller = caller;
__buffer = (null == caller) ? new StringBuilder() : null;
}
/**
* A data structure used to store both character based content and it's
* binary byte array. This is used to optimize the performance when Rythm
* is used to output to a binary outputstream, where the
*/
protected static final class StrBuf {
private final String s_;
private byte[] ba_;
public StrBuf(String s, byte[] ba) {
if (null == s || "".equals(s)) {
s_ = "";
ba_ = new byte[]{};
} else {
s_ = s;
ba_ = ba;
}
}
public StrBuf(String s) {
if (null == s || "".equals(s)) {
s_ = "";
ba_ = new byte[]{};
} else {
s_ = s;
}
}
public String toString() {
return s_;
}
public byte[] toBinary() {
if (null == ba_) {
ba_ = s_.getBytes();
}
return ba_;
}
@Override
public int hashCode() {
return s_.hashCode();
}
@Override
public boolean equals(Object obj) {
if (obj == this) return true;
if (obj instanceof StrBuf) {
return s_.equals(((StrBuf) obj).s_);
}
return false;
}
}
/**
* Append a {@link StrBuf} content into the buffer
*
* @param wrapper
*/
protected void __append(StrBuf wrapper) {
__buffer.append(wrapper.toString());
}
private void p_(StrBuf wrapper) {
if (null != __buffer) __append(wrapper);
else __caller.p(wrapper);
}
/**
* Print a {@link StrBuf} to internal buffer or output (os or writer)
* null object will not be printed
*
* @param wrapper
* @return this builder
*/
public TextBuilder p(StrBuf wrapper) {
if (null != wrapper) p_(wrapper);
return this;
}
/**
* Append a object to internal buffer or output (os or writer).
*
* @param o
*/
protected void __append(Object o) {
__buffer.append(o.toString());
}
private void p_(Object o) {
if (null != __buffer) __append(o);
else __caller.p(o);
}
/**
* Print a {@link java.lang.Object} to internal buffer or output (os or writer)
* null object will not be printed
*
* @param o
* @return this builder
*/
public final TextBuilder p(Object o) {
if (null != o) p_(o);
return this;
}
/**
* Append a char to internal buffer
*
* @param c
*/
protected void __append(char c) {
__buffer.append(c);
}
/**
* Print a char to internal buffer or output (os or writer)
*
* @param c
* @return this builder
*/
public final TextBuilder p(char c) {
if (null != __buffer) __append(c);
else __caller.p(c);
return this;
}
/**
* Append a byte to internal buffer
*
* @param b
*/
protected void __append(byte b) {
__buffer.append(b);
}
/**
* Print a byte to internal buffer or output (os or writer)
*
* @param b
* @return this builder
*/
public final TextBuilder p(byte b) {
if (null != __buffer) __append(b);
else __caller.p(b);
return this;
}
/**
* Append an integer to internal buffer
*
* @param i
*/
protected void __append(int i) {
__buffer.append(i);
}
/**
* Print an integer to internal buffer or output (os or writer)
*
* @param i
* @return this builder
*/
public final TextBuilder p(int i) {
if (null != __buffer) __append(i);
else __caller.p(i);
return this;
}
/**
* Append a long to internal buffer
*
* @param l
*/
protected void __append(long l) {
__buffer.append(l);
}
/**
* Print a long to internal buffer or output (os or writer)
*
* @param l
* @return this builder
*/
public final TextBuilder p(long l) {
if (null != __buffer) __append(l);
else __caller.p(l);
return this;
}
/**
* Append a float to internal buffer
*
* @param f
*/
protected void __append(float f) {
__buffer.append(f);
}
/**
* Print a float to internal buffer or output (os or writer)
*
* @param f
* @return this builder
*/
public final TextBuilder p(float f) {
if (null != __buffer) __append(f);
else __caller.p(f);
return this;
}
/**
* Append a double to internal buffer
*
* @param d
*/
protected void __append(double d) {
__buffer.append(d);
}
/**
* Print a double to internal buffer or output (os or writer)
*
* @param d
* @return this builder
*/
public final TextBuilder p(double d) {
if (null != __buffer) __append(d);
else __caller.p(d);
return this;
}
/**
* Append a boolean to internal buffer
*
* @param b
*/
protected void __append(boolean b) {
__buffer.append(b);
}
/**
* Print a boolean to internal buffer or output (os or writer)
*
* @param b
* @return this builder
*/
public final TextBuilder p(boolean b) {
if (null != __buffer) __append(b);
else __caller.p(b);
return this;
}
/**
* Print an object followed by an new line break
*
* @param o
* @return this builder
*/
public final TextBuilder pn(Object o) {
if (null != o) p_(o);
p_('\n');
return this;
}
/**
* Print an new line break
*
* @return this builder
*/
public final TextBuilder pn() {
p_('\n');
return this;
}
/**
* Print an new line break followed by an object
*
* @param o
* @return this builder
*/
public final TextBuilder np(Object o) {
p_('\n');
if (null != o) p_(o);
return this;
}
/**
* Print an object followed by a tab \t
*
* @param o
* @return this builder
*/
public TextBuilder pt(Object o) {
p("\t").p(o);
return this;
}
/**
* Print an object followed by a tab \t and an new line break
*
* @param o
* @return this builder
*/
public TextBuilder ptn(Object o) {
p("\t").p(o).pn();
return this;
}
/**
* Print an object followed by two tabs \t
*
* @param o
* @return this builder
*/
public TextBuilder p2t(Object o) {
p("\t\t").p(o);
return this;
}
/**
* Print an object followed by 2 tabs \t and an line break
*
* @param o
* @return this builder
*/
public TextBuilder p2tn(Object o) {
p("\t\t").p(o).pn();
return this;
}
/**
* Print an object followed by 3 tabs \t
*
* @param o
* @return this builder
*/
public TextBuilder p3t(Object o) {
p("\t\t\t").p(o);
return this;
}
/**
* Print an object followed by 3 tabs \t and an line break
*
* @param o
* @return this builder
*/
public TextBuilder p3tn(Object o) {
p("\t\t\t").p(o).pn();
return this;
}
/**
* Print an object followed by 4 tabs \t
*
* @param o
* @return this builder
*/
public TextBuilder p4t(Object o) {
p("\t\t\t\t").p(o);
return this;
}
/**
* Print an object followed by 4 tabs \t and an line break
*
* @param o
* @return this builder
*/
public TextBuilder p4tn(Object o) {
p("\t\t\t\t").p(o).pn();
return this;
}
/**
* Sub class could implement this method to append the generated
* source code to the buffer
*
* @return this builder
*/
public TextBuilder build() {
return this;
}
/**
* Return the internal buffer or caller's internal buffer if it is null
*
* @return the content
*/
@Override
public String toString() {
return null != __buffer ? __buffer.toString() : __caller.toString();
}
/**
* return a clone of this TextBuilder instance
*
* @param caller
* @return the clone
*/
public TextBuilder clone(TextBuilder caller) {
try {
TextBuilder tb = (TextBuilder) super.clone();
tb.__caller = caller;
return tb;
} catch (CloneNotSupportedException e) {
throw new FastRuntimeException("Unexpected");
}
}
}
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