Example usage for com.google.common.hash Hasher hash

List of usage examples for com.google.common.hash Hasher hash

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Introduction

In this page you can find the example usage for com.google.common.hash Hasher hash.

Prototype

@CheckReturnValue
HashCode hash();

Source Link

Document

Computes a hash code based on the data that have been provided to this hasher.

Usage

From source file:com.facebook.buck.features.apple.project.ProjectGenerator.java

private HashCode getHeaderSymlinkTreeHashCode(ImmutableSortedMap<Path, Path> contents,
        Optional<String> moduleName, boolean shouldCreateHeadersSymlinks, boolean shouldCreateHeaderMap) {
    Hasher hasher = Hashing.sha1().newHasher();
    hasher.putBytes(ruleKeyConfiguration.getCoreKey().getBytes(Charsets.UTF_8));
    String symlinkState = shouldCreateHeadersSymlinks ? "symlinks-enabled" : "symlinks-disabled";
    byte[] symlinkStateValue = symlinkState.getBytes(Charsets.UTF_8);
    hasher.putInt(symlinkStateValue.length);
    hasher.putBytes(symlinkStateValue);//from www.ja v a2s . c o m
    String hmapState = shouldCreateHeaderMap ? "hmap-enabled" : "hmap-disabled";
    byte[] hmapStateValue = hmapState.getBytes(Charsets.UTF_8);
    hasher.putInt(hmapStateValue.length);
    hasher.putBytes(hmapStateValue);
    if (moduleName.isPresent()) {
        byte[] moduleNameValue = moduleName.get().getBytes(Charsets.UTF_8);
        hasher.putInt(moduleNameValue.length);
        hasher.putBytes(moduleNameValue);
    }
    hasher.putInt(0);
    for (Map.Entry<Path, Path> entry : contents.entrySet()) {
        byte[] key = entry.getKey().toString().getBytes(Charsets.UTF_8);
        byte[] value = entry.getValue().toString().getBytes(Charsets.UTF_8);
        hasher.putInt(key.length);
        hasher.putBytes(key);
        hasher.putInt(value.length);
        hasher.putBytes(value);
    }
    return hasher.hash();
}