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/*
* Copyright (c) 2017 VMware, Inc. All Rights Reserved.
*
* 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.vmware.xenon.common.serialization;
import java.io.IOException;
import java.io.Writer;
import com.google.gson.stream.JsonWriter;
import com.vmware.xenon.common.FNVHash;
/**
* Instead of writing, this class computes a running hash.
*/
public final class HashingJsonWriter extends JsonWriter {
private static final int BEG_ARRAY = 1;
private static final int END_ARRAY = -1;
private static final int BEG_OBJ = 2;
private static final int END_OBJ = -2;
private static final int NAME = 3;
private static final int STRING = 4;
private static final int NULL = 5;
private static final int NUMBER = 6;
private static final int BOOL = 7;
private long hash;
private static final Writer UNWRITABLE_WRITER = new Writer() {
@Override
public void write(char[] buffer, int offset, int counter) {
throw new AssertionError();
}
@Override
public void flush() throws IOException {
throw new AssertionError();
}
@Override
public void close() throws IOException {
throw new AssertionError();
}
};
public HashingJsonWriter(long hash) {
super(UNWRITABLE_WRITER);
setLenient(true);
setSerializeNulls(false);
this.hash = hash;
}
@Override
public JsonWriter beginArray() throws IOException {
this.hash = FNVHash.compute(BEG_ARRAY, this.hash);
return this;
}
@Override
public JsonWriter endArray() throws IOException {
this.hash = FNVHash.compute(END_ARRAY, this.hash);
return this;
}
@Override
public JsonWriter beginObject() throws IOException {
this.hash = FNVHash.compute(BEG_OBJ, this.hash);
return this;
}
@Override
public JsonWriter endObject() throws IOException {
this.hash = FNVHash.compute(END_OBJ, this.hash);
return this;
}
@Override
public JsonWriter name(String name) throws IOException {
long h = this.hash;
h = FNVHash.compute(NAME, h);
h = FNVHash.compute(name, h);
this.hash = h;
return this;
}
@Override
public JsonWriter value(String value) throws IOException {
long h = this.hash;
h = FNVHash.compute(STRING, h);
if (value != null) {
h = FNVHash.compute(value, h);
} else {
h = FNVHash.compute(NULL, h);
}
this.hash = h;
return this;
}
@Override
public JsonWriter nullValue() throws IOException {
this.hash = FNVHash.compute(NULL, this.hash);
return this;
}
@Override
public JsonWriter value(boolean value) throws IOException {
long h = this.hash;
h = FNVHash.compute(BOOL, h);
h = FNVHash.compute(Boolean.hashCode(value), h);
this.hash = h;
return this;
}
@Override
public JsonWriter value(double value) throws IOException {
long h = this.hash;
h = FNVHash.compute(NUMBER, h);
long bits = Double.doubleToLongBits(value);
h = FNVHash.compute((int) bits, h);
h = FNVHash.compute((int) (bits >> 32), h);
this.hash = h;
return this;
}
@Override
public JsonWriter value(Boolean value) throws IOException {
long h = this.hash;
h = FNVHash.compute(BOOL, h);
if (value != null) {
h = FNVHash.compute(Boolean.hashCode(value), h);
} else {
h = FNVHash.compute(NULL, h);
}
this.hash = h;
return this;
}
@Override
public JsonWriter value(long value) throws IOException {
long h = this.hash;
h = FNVHash.compute(NUMBER, h);
h = FNVHash.compute((int) value, h);
h = FNVHash.compute((int) (value >> 32), h);
this.hash = h;
return this;
}
@Override
public JsonWriter value(Number value) throws IOException {
long h = this.hash;
h = FNVHash.compute(NUMBER, h);
if (value != null) {
h = FNVHash.compute(value.toString(), h);
} else {
h = FNVHash.compute(NULL, h);
}
this.hash = h;
return this;
}
@Override
public void flush() throws IOException {
}
@Override
public void close() throws IOException {
}
public long getHash() {
return this.hash;
}
}
