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package com.paypal.butterfly.utilities.operations.text;
import com.paypal.butterfly.utilities.operations.EolHelper;
import java.io.IOException;
import java.io.Writer;
/**
* Replaces one, or more, lines from a text file.
* The line to be replace is chosen either based on a regular
* expression, or by the line number.
*
* If the regular expression
* is set, only the first line found to match it will be replaced,
* unless {@link #setFirstOnly(boolean)} is set to false, then
* all lines that match it will be replaced.
*
* If a regular expression and a line number are both set,
* the line number will take precedence, and the regular expression
* will be ignored
*
* @author facarvalho
*/
public class ReplaceLine extends AbstractLineOperation {
private static final String DESCRIPTION = "Replace line(s) from file %s";
private static final String MANIPULATION_WORD = "replaced";
// The replacement line
private String replacement;
/**
* Operation to replace one, or more, lines from a text file.
* The line to be replaced is chosen either based on a regular
* expression, or by the line number.
*
* If the regular expression
* is set, only the first found to match it will be replaced,
* unless {@link #setFirstOnly(boolean)} is set to false, then
* all lines that match it will be replaced.
*
* If a regular expression and a line number are both set,
* the line number will take precedence, and the regular expression
* will be ignored
*/
public ReplaceLine() {
super();
manipulationWord = MANIPULATION_WORD;
}
/**
* Operation to replace one, or more, lines from a text file.
* The line to be replaced is chosen either based on a regular
* expression, or by the line number.
*
* If the regular expression
* is set, only the first found to match it will be replaced,
* unless {@link #setFirstOnly(boolean)} is set to false, then
* all lines that match it will be replaced.
*
* If a regular expression and a line number are both set,
* the line number will take precedence, and the regular expression
* will be ignored
*
* @param regex the regular expression to identify the line(s) to be replaced
* @param replacement the replacement line. It is not necessary to add explicitly any
* end of line (EOL) character in the end of the line, that will be done
* automatically, but ONLY if the original line has an EOL character too.
* The same format of EOL character will be preserved.
* If any EOL character is present anywhere in {@code replacement}, it
* will not be removed nor changed.
*/
public ReplaceLine(String regex, String replacement) {
super(regex);
setReplacement(replacement);
manipulationWord = MANIPULATION_WORD;
}
/**
* Operation to replace one, or more, lines from a text file.
* The line to be replaced is chosen either based on a regular
* expression, or by the line number.
*
* If the regular expression
* is set, only the first found to match it will be replaced,
* unless {@link #setFirstOnly(boolean)} is set to false, then
* all lines that match it will be replaced.
*
* If a regular expression and a line number are both set,
* the line number will take precedence, and the regular expression
* will be ignored
*
* @param regex the regular expression to identify the line(s) to be replaced
* @param replacement the replacement line. It is not necessary to add explicitly any
* end of line (EOL) character in the end of the line, that will be done
* automatically, but ONLY if the original line has an EOL character too.
* The same format of EOL character will be preserved.
* If any EOL character is present anywhere in {@code replacement}, it
* will not be removed nor changed.
* @param firstOnly if true, only the first line found (from top down) to match
* the regular expression will be replaced. If false, all of them
* will
*/
public ReplaceLine(String regex, String replacement, boolean firstOnly) {
super(regex, firstOnly);
setReplacement(replacement);
manipulationWord = MANIPULATION_WORD;
}
/**
* Operation to replace one line from a text file, based on a
* line number.
*
* @param replacement the replacement line. It is not necessary to add explicitly any
* end of line (EOL) character in the end of the line, that will be done
* automatically, but ONLY if the original line has an EOL character too.
* The same format of EOL character will be preserved.
* If any EOL character is present anywhere in {@code replacement}, it
* will not be removed nor changed.
* @param lineNumber the number of the line to be replaced
*/
public ReplaceLine(Integer lineNumber, String replacement) {
super(lineNumber);
setReplacement(replacement);
manipulationWord = MANIPULATION_WORD;
}
/**
* Sets the replacement line
*
* @param replacement the replacement line. It is not necessary to add explicitly any
* end of line (EOL) character in the end of the line, that will be done
* automatically, but ONLY if the original line has an EOL character too.
* The same format of EOL character will be preserved.
* If any EOL character is present anywhere in {@code replacement}, it
* will not be removed nor changed.
* @return this transformation operation instance
*/
public ReplaceLine setReplacement(String replacement) {
checkForNull("Replacement Line", replacement);
this.replacement = replacement;
return this;
}
public String getReplacement() {
return replacement;
}
@Override
public String getDescription() {
return String.format(DESCRIPTION, getRelativePath());
}
@Override
protected boolean manipulateLine(String lineToBeManipulated, Writer writer) throws IOException {
String eol = EolHelper.getStartEol(lineToBeManipulated);
boolean written = false;
if (eol != null) {
writer.write(eol);
written = true;
}
if (replacement != null) {
writer.write(replacement);
written = true;
}
return written;
}
}
