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package javax.mail.search;
/**
* This class implements the match method for Strings. The current
* implementation provides only for substring matching. We
* could add comparisons (like strcmp ...).
*
* @author Bill Shannon
* @author John Mani
*/
public abstract class
StringTerm extends
SearchTerm {
/**
* The pattern.
*
* @serial
*/
protected
String pattern;
/**
* Ignore case when comparing?
*
* @serial
*/
protected boolean
ignoreCase;
private static final long
serialVersionUID = 1274042129007696269L;
/**
* Construct a StringTerm with the given pattern.
* Case will be ignored.
*
* @param pattern the pattern
*/
protected
StringTerm(
String pattern) {
this.
pattern =
pattern;
ignoreCase = true;
}
/**
* Construct a StringTerm with the given pattern and ignoreCase flag.
*
* @param pattern the pattern
* @param ignoreCase should we ignore case?
*/
protected
StringTerm(
String pattern, boolean
ignoreCase) {
this.
pattern =
pattern;
this.
ignoreCase =
ignoreCase;
}
/**
* Return the string to match with.
*
* @return the string to match
*/
public
String getPattern() {
return
pattern;
}
/**
* Return true if we should ignore case when matching.
*
* @return true if we should ignore case
*/
public boolean
getIgnoreCase() {
return
ignoreCase;
}
protected boolean
match(
String s) {
int
len =
s.
length() -
pattern.
length();
for (int
i=0;
i <=
len;
i++) {
if (
s.
regionMatches(
ignoreCase,
i,
pattern, 0,
pattern.
length()))
return true;
}
return false;
}
/**
* Equality comparison.
*/
@
Override
public boolean
equals(
Object obj) {
if (!(
obj instanceof
StringTerm))
return false;
StringTerm st = (
StringTerm)
obj;
if (
ignoreCase)
return
st.
pattern.
equalsIgnoreCase(this.
pattern) &&
st.
ignoreCase == this.
ignoreCase;
else
return
st.
pattern.
equals(this.
pattern) &&
st.
ignoreCase == this.
ignoreCase;
}
/**
* Compute a hashCode for this object.
*/
@
Override
public int
hashCode() {
return
ignoreCase ?
pattern.
hashCode() : ~
pattern.
hashCode();
}
}