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authorBenjamin J. Culkin <bjculkin@mix.wvu.edu>2017-10-08 22:39:59 -0300
committerBenjamin J. Culkin <bjculkin@mix.wvu.edu>2017-10-08 22:39:59 -0300
commitc82e3b3b2de0633317ec8fc85925e91422820597 (patch)
tree96567416ce23c5ce85601f9cedc3a94bb1c55cba /BJC-Utils2/src/main/java/bjc/utils/data/SingleSupplier.java
parentb3ac1c8690c3e14c879913e5dcc03a5f5e14876e (diff)
Start splitting into maven modules
Diffstat (limited to 'BJC-Utils2/src/main/java/bjc/utils/data/SingleSupplier.java')
-rw-r--r--BJC-Utils2/src/main/java/bjc/utils/data/SingleSupplier.java72
1 files changed, 0 insertions, 72 deletions
diff --git a/BJC-Utils2/src/main/java/bjc/utils/data/SingleSupplier.java b/BJC-Utils2/src/main/java/bjc/utils/data/SingleSupplier.java
deleted file mode 100644
index c675ebf..0000000
--- a/BJC-Utils2/src/main/java/bjc/utils/data/SingleSupplier.java
+++ /dev/null
@@ -1,72 +0,0 @@
-package bjc.utils.data;
-
-import java.util.function.Supplier;
-
-/**
- * A supplier that can only supply one value.
- *
- * Attempting to retrieve another value will cause an exception to be thrown.
- *
- * @author ben
- *
- * @param <T>
- * The supplied type
- */
-public class SingleSupplier<T> implements Supplier<T> {
- private static long nextID = 0;
-
- private final Supplier<T> source;
-
- private boolean gotten;
-
- private final long id;
-
- /*
- * This is bad practice, but I want to know where the single
- * instantiation was, in case of duplicate initiations.
- */
- private Exception instSite;
-
- /**
- * Create a new single supplier from an existing value
- *
- * @param supp
- * The supplier to give a single value from
- */
- public SingleSupplier(final Supplier<T> supp) {
- source = supp;
-
- gotten = false;
-
- id = nextID++;
- }
-
- @Override
- public T get() {
- if (gotten == true) {
- final String msg = String.format(
- "Attempted to retrieve value more than once from single supplier #%d", id);
-
- final IllegalStateException isex = new IllegalStateException(msg);
-
- isex.initCause(instSite);
-
- throw isex;
- }
-
- gotten = true;
-
- try {
- throw new IllegalStateException("Previous instantiation here.");
- } catch (final IllegalStateException isex) {
- instSite = isex;
- }
-
- return source.get();
- }
-
- @Override
- public String toString() {
- return String.format("SingleSupplier [source='%s', gotten=%s, id=%s]", source, gotten, id);
- }
-}