Mega Code Archive
Writer implementation that outputs to a StringBuilder
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import java.io.Serializable;
import java.io.Writer;
/**
* {@link Writer} implementation that outputs to a {@link StringBuilder}.
* <p>
* <strong>NOTE:</strong> This implementation, as an alternative to
* <code>java.io.StringWriter</code>, provides an <i>un-synchronized</i> (i.e.
* for use in a single thread) implementation for better performance. For safe
* usage with multiple {@link Thread}s then <code>java.io.StringWriter</code>
* should be used.
*
* ***Copied & Pasted from apache commons-io because I dont want to add too many
* 3rd parties library to the app to keep it as small as possible***
*
* @version $Revision$ $Date$
* @since IO 2.0
*/
class StringBuilderWriter extends Writer implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
private final StringBuilder builder;
/**
* Construct a new {@link StringBuilder} instance with default capacity.
*/
public StringBuilderWriter() {
this.builder = new StringBuilder();
}
/**
* Construct a new {@link StringBuilder} instance with the specified
* capacity.
*
* @param capacity
* The initial capacity of the underlying {@link StringBuilder}
*/
public StringBuilderWriter(int capacity) {
this.builder = new StringBuilder(capacity);
}
/**
* Construct a new instance with the specified {@link StringBuilder}.
*
* @param builder
* The String builder
*/
public StringBuilderWriter(StringBuilder builder) {
this.builder = (builder != null ? builder : new StringBuilder());
}
/**
* Append a single character to this Writer.
*
* @param value
* The character to append
* @return This writer instance
*/
@Override
public Writer append(char value) {
builder.append(value);
return this;
}
/**
* Append a character sequence to this Writer.
*
* @param value
* The character to append
* @return This writer instance
*/
@Override
public Writer append(CharSequence value) {
builder.append(value);
return this;
}
/**
* Append a portion of a character sequence to the {@link StringBuilder}.
*
* @param value
* The character to append
* @param start
* The index of the first character
* @param end
* The index of the last character + 1
* @return This writer instance
*/
@Override
public Writer append(CharSequence value, int start, int end) {
builder.append(value, start, end);
return this;
}
/**
* Closing this writer has no effect.
*/
@Override
public void close() {
}
/**
* Flushing this writer has no effect.
*/
@Override
public void flush() {
}
/**
* Write a String to the {@link StringBuilder}.
*
* @param value
* The value to write
*/
@Override
public void write(String value) {
if (value != null) {
builder.append(value);
}
}
/**
* Write a portion of a character array to the {@link StringBuilder}.
*
* @param value
* The value to write
* @param offset
* The index of the first character
* @param length
* The number of characters to write
*/
@Override
public void write(char[] value, int offset, int length) {
if (value != null) {
builder.append(value, offset, length);
}
}
/**
* Return the underlying builder.
*
* @return The underlying builder
*/
public StringBuilder getBuilder() {
return builder;
}
/**
* Returns {@link StringBuilder#toString()}.
*
* @return The contents of the String builder.
*/
@Override
public String toString() {
return builder.toString();
}
}
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