1 files changed, 75 insertions, 0 deletions
diff --git a/guava/src/com/google/common/hash/Hasher.java b/guava/src/com/google/common/hash/Hasher.java
new file mode 100644
index 0000000..ddb4ca6
--- /dev/null
+++ b/guava/src/com/google/common/hash/Hasher.java
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2011 The Guava Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+package com.google.common.hash;
+
+import com.google.common.annotations.Beta;
+
+import java.nio.charset.Charset;
+
+/**
+ * A {@link PrimitiveSink} that can compute a hash code after reading the input. Each hasher should
+ * translate all multibyte values ({@link #putInt(int)}, {@link #putLong(long)}, etc) to bytes
+ * in little-endian order.
+ *
+ * @author Kevin Bourrillion
+ * @since 11.0
+ */
+@Beta
+public interface Hasher extends PrimitiveSink {
+  @Override Hasher putByte(byte b);
+  @Override Hasher putBytes(byte[] bytes);
+  @Override Hasher putBytes(byte[] bytes, int off, int len);
+  @Override Hasher putShort(short s);
+  @Override Hasher putInt(int i);
+  @Override Hasher putLong(long l);
+
+  /**
+   * Equivalent to {@code putInt(Float.floatToRawIntBits(f))}.
+   */
+  @Override Hasher putFloat(float f);
+
+  /**
+   * Equivalent to {@code putLong(Double.doubleToRawLongBits(d))}.
+   */
+  @Override Hasher putDouble(double d);
+
+  /**
+   * Equivalent to {@code putByte(b ? (byte) 1 : (byte) 0)}.
+   */
+  @Override Hasher putBoolean(boolean b);
+  @Override Hasher putChar(char c);
+
+  /**
+   * Equivalent to processing each {@code char} value in the {@code CharSequence}, in order.
+   * The input must not be updated while this method is in progress.
+   */
+  @Override Hasher putString(CharSequence charSequence);
+
+  /**
+   * Equivalent to {@code putBytes(charSequence.toString().getBytes(charset))}.
+   */
+  @Override Hasher putString(CharSequence charSequence, Charset charset);
+
+  /**
+   * A simple convenience for {@code funnel.funnel(object, this)}.
+   */
+  <T> Hasher putObject(T instance, Funnel<? super T> funnel);
+
+  /**
+   * Computes a hash code based on the data that have been provided to this hasher. The result is
+   * unspecified if this method is called more than once on the same instance.
+   */
+  HashCode hash();
+}