com.ctc.wstx.util.TextAccumulator Maven / Gradle / Ivy
package com.ctc.wstx.util;
/**
* Simple utility class used to efficiently accumulate and concatenate
* text passed in various forms
*/
public final class TextAccumulator
{
private String mText = null;
/* !!! JDK 1.5: when we can upgrade to Java 5, can convert
* to using StringBuilder instead.
*/
private StringBuffer mBuilder = null;
public TextAccumulator() { }
public boolean hasText() {
return (mBuilder != null) || (mText != null);
}
public void addText(String text)
{
int len = text.length();
if (len > 0) {
// Any prior text?
if (mText != null) {
mBuilder = new StringBuffer(mText.length() + len);
mBuilder.append(mText);
mText = null;
}
if (mBuilder != null) {
mBuilder.append(text);
} else {
mText = text;
}
}
}
public void addText(char[] buf, int start, int end)
{
int len = end-start;
if (len > 0) {
// Any prior text?
if (mText != null) {
mBuilder = new StringBuffer(mText.length() + len);
mBuilder.append(mText);
mText = null;
} else if (mBuilder == null) {
/* more efficient to use a builder than a string; and although
* could use a char array, StringBuilder has the benefit of
* being able to share the array, eventually.
*/
mBuilder = new StringBuffer(len);
}
mBuilder.append(buf, start, end-start);
}
}
public String getAndClear()
{
String result;
if (mText != null) {
result = mText;
mText = null;
} else if (mBuilder != null) {
result = mBuilder.toString();
mBuilder = null;
} else {
result = "";
}
return result;
}
}