| #! /usr/bin/env python |
| |
| # Licensed to the Apache Software Foundation (ASF) under one or more |
| # contributor license agreements. See the NOTICE file distributed with |
| # this work for additional information regarding copyright ownership. |
| # The ASF licenses this file to You 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. |
| |
| HEADER = """// This file has been automatically generated, DO NOT EDIT |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.lucene.util.packed; |
| |
| import org.apache.lucene.store.DataInput; |
| import org.apache.lucene.util.RamUsageEstimator; |
| |
| import java.io.IOException; |
| import java.util.Arrays; |
| |
| """ |
| |
| TYPES = {8: "byte", 16: "short", 32: "int", 64: "long"} |
| MASKS = {8: " & 0xFFL", 16: " & 0xFFFFL", 32: " & 0xFFFFFFFFL", 64: ""} |
| CASTS = {8: "(byte) ", 16: "(short) ", 32: "(int) ", 64: ""} |
| |
| if __name__ == '__main__': |
| for bpv in TYPES.keys(): |
| type |
| f = open("Direct%d.java" % bpv, 'w') |
| f.write(HEADER) |
| f.write("""/** |
| * Direct wrapping of %d-bits values to a backing array. |
| * @lucene.internal |
| */\n""" % bpv) |
| f.write("final class Direct%d extends PackedInts.MutableImpl {\n" % bpv) |
| f.write(" final %s[] values;\n\n" % TYPES[bpv]) |
| |
| f.write(" Direct%d(int valueCount) {\n" % bpv) |
| f.write(" super(valueCount, %d);\n" % bpv) |
| f.write(" values = new %s[valueCount];\n" % TYPES[bpv]) |
| f.write(" }\n\n") |
| |
| f.write(" Direct%d(int packedIntsVersion, DataInput in, int valueCount) throws IOException {\n" % bpv) |
| f.write(" this(valueCount);\n") |
| if bpv == 8: |
| f.write(" in.readBytes(values, 0, valueCount);\n") |
| else: |
| f.write(" for (int i = 0; i < valueCount; ++i) {\n") |
| f.write(" values[i] = in.read%s();\n" % TYPES[bpv].title()) |
| f.write(" }\n") |
| if bpv != 64: |
| f.write(" // because packed ints have not always been byte-aligned\n") |
| f.write(" final int remaining = (int) (PackedInts.Format.PACKED.byteCount(packedIntsVersion, valueCount, %d) - %dL * valueCount);\n" % (bpv, bpv / 8)) |
| f.write(" for (int i = 0; i < remaining; ++i) {\n") |
| f.write(" in.readByte();\n") |
| f.write(" }\n") |
| f.write(" }\n") |
| |
| f.write(""" |
| @Override |
| public long get(final int index) { |
| return values[index]%s; |
| } |
| |
| @Override |
| public void set(final int index, final long value) { |
| values[index] = %s(value); |
| } |
| |
| @Override |
| public long ramBytesUsed() { |
| return RamUsageEstimator.alignObjectSize( |
| RamUsageEstimator.NUM_BYTES_OBJECT_HEADER |
| + 2 * RamUsageEstimator.NUM_BYTES_INT // valueCount,bitsPerValue |
| + RamUsageEstimator.NUM_BYTES_OBJECT_REF) // values ref |
| + RamUsageEstimator.sizeOf(values); |
| } |
| |
| @Override |
| public void clear() { |
| Arrays.fill(values, %s0L); |
| } |
| """ % (MASKS[bpv], CASTS[bpv], CASTS[bpv])) |
| |
| if bpv == 64: |
| f.write(""" |
| @Override |
| public int get(int index, long[] arr, int off, int len) { |
| assert len > 0 : "len must be > 0 (got " + len + ")"; |
| assert index >= 0 && index < valueCount; |
| assert off + len <= arr.length; |
| |
| final int gets = Math.min(valueCount - index, len); |
| System.arraycopy(values, index, arr, off, gets); |
| return gets; |
| } |
| |
| @Override |
| public int set(int index, long[] arr, int off, int len) { |
| assert len > 0 : "len must be > 0 (got " + len + ")"; |
| assert index >= 0 && index < valueCount; |
| assert off + len <= arr.length; |
| |
| final int sets = Math.min(valueCount - index, len); |
| System.arraycopy(arr, off, values, index, sets); |
| return sets; |
| } |
| |
| @Override |
| public void fill(int fromIndex, int toIndex, long val) { |
| Arrays.fill(values, fromIndex, toIndex, val); |
| } |
| """) |
| else: |
| f.write(""" |
| @Override |
| public int get(int index, long[] arr, int off, int len) { |
| assert len > 0 : "len must be > 0 (got " + len + ")"; |
| assert index >= 0 && index < valueCount; |
| assert off + len <= arr.length; |
| |
| final int gets = Math.min(valueCount - index, len); |
| for (int i = index, o = off, end = index + gets; i < end; ++i, ++o) { |
| arr[o] = values[i]%s; |
| } |
| return gets; |
| } |
| |
| @Override |
| public int set(int index, long[] arr, int off, int len) { |
| assert len > 0 : "len must be > 0 (got " + len + ")"; |
| assert index >= 0 && index < valueCount; |
| assert off + len <= arr.length; |
| |
| final int sets = Math.min(valueCount - index, len); |
| for (int i = index, o = off, end = index + sets; i < end; ++i, ++o) { |
| values[i] = %sarr[o]; |
| } |
| return sets; |
| } |
| |
| @Override |
| public void fill(int fromIndex, int toIndex, long val) { |
| assert val == (val%s); |
| Arrays.fill(values, fromIndex, toIndex, %sval); |
| } |
| """ % (MASKS[bpv], CASTS[bpv], MASKS[bpv], CASTS[bpv])) |
| |
| f.write("}\n") |
| |
| f.close() |