FT data models

src/main/java/io/split/android/client/fallback/FallbackConfiguration.java

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+package io.split.android.client.fallback;
+
+import androidx.annotation.Nullable;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+
+public final class FallbackConfiguration {
+
+    @Nullable
+    private final FallbackTreatment mGlobal;
+    private final Map<String, FallbackTreatment> mByFlag;
+
+    private FallbackConfiguration(@Nullable FallbackTreatment global,
+                                  @Nullable Map<String, FallbackTreatment> byFlag) {
+        mGlobal = global;
+        if (byFlag == null || byFlag.isEmpty()) {
+            mByFlag = Collections.emptyMap();
+        } else {
+            mByFlag = Collections.unmodifiableMap(new HashMap<>(byFlag));
+        }
+    }
+
+    @Nullable
+    public FallbackTreatment getGlobal() {
+        return mGlobal;
+    }
+
+    public Map<String, FallbackTreatment> getByFlag() {
+        return mByFlag;
+    }
+
+    /**
+     * Creates a new {@link Builder} for {@link FallbackConfiguration}.
+     * Use this to provide an optional global fallback and flag-specific fallbacks.
+     */
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    public static final class Builder {
+        @Nullable
+        private FallbackTreatment mGlobal;
+        @Nullable
+        private Map<String, FallbackTreatment> mByFlag;
+
+        private Builder() {
+            mGlobal = null;
+            mByFlag = null;
+        }
+
+        /**
+         * Sets an optional global fallback treatment to be used when no flag-specific
+         * fallback exists for a given flag. This value is returned only in place of
+         * the "control" treatment.
+         *
+         * @param global optional global {@link FallbackTreatment}
+         * @return this builder instance
+         */
+        public Builder global(@Nullable FallbackTreatment global) {
+            mGlobal = global;
+            return this;
+        }
+
+        /**
+         * Sets optional flag-specific fallback treatments, where keys are flag names.
+         * These take precedence over the global fallback.
+         *
+         * @param byFlag map of flag name to {@link FallbackTreatment}; may be null or empty
+         * @return this builder instance
+         */
+        public Builder byFlag(@Nullable Map<String, FallbackTreatment> byFlag) {
+            mByFlag = byFlag;
+            return this;
+        }
+
+        /**
+         * Builds an immutable {@link FallbackConfiguration} snapshot of the
+         * configured values.
+         *
+         * @return a new immutable {@link FallbackConfiguration}
+         */
+        public FallbackConfiguration build() {
+            return new FallbackConfiguration(mGlobal, mByFlag);
+        }
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        FallbackConfiguration that = (FallbackConfiguration) o;
+        return Objects.equals(mGlobal, that.mGlobal) &&
+                Objects.equals(mByFlag, that.mByFlag);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(mGlobal, mByFlag);
+    }
+}

src/main/java/io/split/android/client/fallback/FallbackTreatment.java

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+package io.split.android.client.fallback;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import java.util.Objects;
+
+/**
+ * Represents the fallback treatment, with an optional config and a fixed label.
+ */
+public final class FallbackTreatment {
+
+    public static final String LABEL = "fallback treatment";
+
+    @NonNull
+    private final String mTreatment;
+    @Nullable
+    private final String mConfig;
+
+    public FallbackTreatment(@NonNull String treatment) {
+        this(treatment, null);
+    }
+
+    public FallbackTreatment(@NonNull String treatment, @Nullable String config) {
+        mTreatment = treatment;
+        mConfig = config;
+    }
+
+    public String getTreatment() {
+        return mTreatment;
+    }
+
+    @Nullable
+    public String getConfig() {
+        return mConfig;
+    }
+
+    public String getLabel() {
+        return LABEL;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        FallbackTreatment that = (FallbackTreatment) o;
+        return Objects.equals(mTreatment, that.mTreatment) &&
+                Objects.equals(mConfig, that.mConfig);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(mTreatment, mConfig);
+    }
+}

src/test/java/io/split/android/client/fallback/FallbackConfigurationTest.java

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+package io.split.android.client.fallback;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+import static org.junit.Assert.assertSame;
+
+import org.junit.Test;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class FallbackConfigurationTest {
+
+    @Test
+    public void constructorSetsFields() {
+        FallbackTreatment global = new FallbackTreatment("off");
+        Map<String, FallbackTreatment> map = new HashMap<>();
+        map.put("flagA", new FallbackTreatment("off"));
+
+        FallbackConfiguration cfg = FallbackConfiguration.builder()
+                .global(global)
+                .byFlag(map)
+                .build();
+
+        assertSame(global, cfg.getGlobal());
+        assertEquals(1, cfg.getByFlag().size());
+        assertEquals("off", cfg.getByFlag().get("flagA").getTreatment());
+    }
+
+    @Test
+    public void byFlagIsUnmodifiable() {
+        FallbackTreatment global = new FallbackTreatment("off");
+        Map<String, FallbackTreatment> byFlag = new HashMap<>();
+        byFlag.put("flagA", new FallbackTreatment("off"));
+
+        FallbackConfiguration config = FallbackConfiguration.builder()
+                .global(global)
+                .byFlag(byFlag)
+                .build();
+
+        byFlag.put("flagB", new FallbackTreatment("on"));
+
+        // config map must not change
+        assertEquals(1, config.getByFlag().size());
+
+        try {
+            config.getByFlag().put("x", new FallbackTreatment("on"));
+            throw new AssertionError("Map should be unmodifiable");
+        } catch (UnsupportedOperationException expected) {
+
+        }
+    }
+
+    @Test
+    public void equalityAndHashCodeByValue() {
+        FallbackTreatment global = new FallbackTreatment("off");
+        Map<String, FallbackTreatment> a = new HashMap<>();
+        a.put("flagA", new FallbackTreatment("off"));
+
+        Map<String, FallbackTreatment> b = new HashMap<>();
+        b.put("flagA", new FallbackTreatment("off"));
+
+        FallbackConfiguration configOne = FallbackConfiguration.builder().global(global).byFlag(a).build();
+        FallbackConfiguration configTwo = FallbackConfiguration.builder().global(global).byFlag(b).build();
+        FallbackConfiguration configThree = FallbackConfiguration.builder().global(null).byFlag(b).build();
+
+        assertEquals(configOne, configTwo);
+        assertEquals(configOne.hashCode(), configTwo.hashCode());
+        assertNotEquals(configOne, configThree);
+        assertNotEquals(configOne.hashCode(), configThree.hashCode());
+    }
+}

src/test/java/io/split/android/client/fallback/FallbackTreatmentTest.java

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+package io.split.android.client.fallback;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+import static org.junit.Assert.assertNull;
+
+import org.junit.Test;
+
+public class FallbackTreatmentTest {
+
+    private static final String FALLBACK_TREATMENT = "fallback treatment";
+
+    @Test
+    public void constructorSetsFields() {
+        FallbackTreatment ft = new FallbackTreatment("off", "{\"k\":true}");
+        assertEquals("off", ft.getTreatment());
+        assertEquals("{\"k\":true}", ft.getConfig());
+        assertEquals(FALLBACK_TREATMENT, ft.getLabel());
+    }
+
+    @Test
+    public void configCanBeNull() {
+        FallbackTreatment ft = new FallbackTreatment("off", null);
+        assertEquals("off", ft.getTreatment());
+        assertNull(ft.getConfig());
+        assertEquals(FALLBACK_TREATMENT, ft.getLabel());
+    }
+
+    @Test
+    public void convenienceConstructorSetsNullConfig() {
+        FallbackTreatment ft = new FallbackTreatment("off");
+        assertEquals("off", ft.getTreatment());
+        assertNull(ft.getConfig());
+        assertEquals(FALLBACK_TREATMENT, ft.getLabel());
+    }
+
+    @Test
+    public void equalityAndHashCodeByValue() {
+        FallbackTreatment a = new FallbackTreatment("off", null);
+        FallbackTreatment b = new FallbackTreatment("off", null);
+        FallbackTreatment c = new FallbackTreatment("on", null);
+
+        assertEquals(a, b);
+        assertEquals(a.hashCode(), b.hashCode());
+        assertNotEquals(a, c);
+    }
+}