com.ibm.icu.impl.number.AdoptingModifierStore Maven / Gradle / Ivy
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// © 2017 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html#License
package com.ibm.icu.impl.number;
import com.ibm.icu.impl.StandardPlural;
/**
* This implementation of ModifierStore adopts references to Modifiers.
*
* (This is named "adopting" because in C++, this class takes ownership of the Modifiers.)
*/
public class AdoptingModifierStore implements ModifierStore {
private final Modifier positive;
private final Modifier zero;
private final Modifier negative;
final Modifier[] mods;
boolean frozen;
/**
* This constructor populates the ParameterizedModifier with a single positive and negative form.
*
*
* If this constructor is used, a plural form CANNOT be passed to {@link #getModifier}.
*/
public AdoptingModifierStore(Modifier positive, Modifier zero, Modifier negative) {
this.positive = positive;
this.zero = zero;
this.negative = negative;
this.mods = null;
this.frozen = true;
}
/**
* This constructor prepares the ParameterizedModifier to be populated with a positive and negative
* Modifier for multiple plural forms.
*
*
* If this constructor is used, a plural form MUST be passed to {@link #getModifier}.
*/
public AdoptingModifierStore() {
this.positive = null;
this.zero = null;
this.negative = null;
this.mods = new Modifier[3 * StandardPlural.COUNT];
this.frozen = false;
}
public void setModifier(int signum, StandardPlural plural, Modifier mod) {
assert !frozen;
mods[getModIndex(signum, plural)] = mod;
}
public void freeze() {
frozen = true;
}
public Modifier getModifierWithoutPlural(int signum) {
assert frozen;
assert mods == null;
return signum == 0 ? zero : signum < 0 ? negative : positive;
}
public Modifier getModifier(int signum, StandardPlural plural) {
assert frozen;
assert positive == null;
return mods[getModIndex(signum, plural)];
}
private static int getModIndex(int signum, StandardPlural plural) {
assert signum >= -1 && signum <= 1;
assert plural != null;
return plural.ordinal() * 3 + (signum + 1);
}
}