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63 changes: 63 additions & 0 deletions
63
src/main/java/org/sheinbergon/dremio/udf/gis/STSimplifyPreserveTopology.java
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| @@ -0,0 +1,63 @@ | ||
| /** | ||
| * 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 | ||
| * <p> | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * <p> | ||
| * 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.sheinbergon.dremio.udf.gis; | ||
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| import com.dremio.exec.expr.SimpleFunction; | ||
| import com.dremio.exec.expr.annotations.FunctionTemplate; | ||
| import com.dremio.exec.expr.annotations.Output; | ||
| import com.dremio.exec.expr.annotations.Param; | ||
|
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| import javax.inject.Inject; | ||
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| @FunctionTemplate( | ||
| name = "ST_SimplifyPreserveTopology", | ||
| scope = FunctionTemplate.FunctionScope.SIMPLE, | ||
| nulls = FunctionTemplate.NullHandling.INTERNAL, | ||
| costCategory = FunctionTemplate.FunctionCostCategory.COMPLEX) | ||
| public class STSimplifyPreserveTopology implements SimpleFunction { | ||
|
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| @Param | ||
| org.apache.arrow.vector.holders.NullableVarBinaryHolder binaryInput; | ||
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| @Param | ||
| org.apache.arrow.vector.holders.Float8Holder toleranceInput; | ||
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| @Output | ||
| org.apache.arrow.vector.holders.NullableVarBinaryHolder binaryOutput; | ||
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| @Inject | ||
| org.apache.arrow.memory.ArrowBuf buffer; | ||
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| public void setup() { | ||
| } | ||
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| public void eval() { | ||
| if (org.sheinbergon.dremio.udf.gis.util.GeometryHelpers.isHolderSet(binaryInput)) { | ||
| double tolerance = toleranceInput.value; | ||
| org.locationtech.jts.geom.Geometry geom = org.sheinbergon.dremio.udf.gis.util.GeometryHelpers.toGeometry(binaryInput); | ||
| org.locationtech.jts.simplify.TopologyPreservingSimplifier simplifier = new org.locationtech.jts.simplify.TopologyPreservingSimplifier(geom); | ||
| simplifier.setDistanceTolerance(tolerance); | ||
| org.locationtech.jts.geom.Geometry result = simplifier.getResultGeometry(); | ||
| byte[] bytes = org.sheinbergon.dremio.udf.gis.util.GeometryHelpers.toEWKB(result); | ||
| buffer = buffer.reallocIfNeeded(bytes.length); | ||
| org.sheinbergon.dremio.udf.gis.util.GeometryHelpers.populate(bytes, buffer, binaryOutput); | ||
| } else { | ||
| org.sheinbergon.dremio.udf.gis.util.GeometryHelpers.markHolderNotSet(binaryOutput); | ||
| } | ||
| } | ||
| } |
37 changes: 37 additions & 0 deletions
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src/test/kotlin/org/sheinbergon/dremio/udf/gis/STSimplifyPreserveTopologyTests.kt
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| package org.sheinbergon.dremio.udf.gis | ||
|
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| import org.apache.arrow.vector.holders.Float8Holder | ||
| import org.apache.arrow.vector.holders.NullableVarBinaryHolder | ||
| import org.sheinbergon.dremio.udf.gis.spec.GeometryProcessingFunSpec | ||
| import org.sheinbergon.dremio.udf.gis.util.allocateBuffer | ||
| import org.sheinbergon.dremio.udf.gis.util.reset | ||
|
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| internal class STSimplifyPreserveTopologyTests : GeometryProcessingFunSpec<STSimplifyPreserveTopology>() { | ||
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| init { | ||
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| beforeEach { | ||
| function.toleranceInput.reset() | ||
| } | ||
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| testGeometryProcessing( | ||
| name = "Calling ST_SimplifyPreserveTopology on a MULTILINESTRING with a tolerance of 40.0", | ||
| wkt = "MULTILINESTRING ((20 180, 20 150, 50 150, 50 100, 110 150, 150 140, 170 120), (20 10, 80 30, 90 120), (90 120, 130 130), (130 130, 130 70, 160 40, 180 60, 180 90, 140 80), (50 40, 70 40, 80 70, 70 60, 60 60, 50 50, 50 40))", | ||
| expected = " MULTILINESTRING((20 180,50 100,110 150,170 120),(20 10,90 120),(90 120,130 130),(130 130,130 70,160 40,180 90,140 80),(50 40,70 40,80 70,60 60,50 40))" | ||
| ) { function.toleranceInput.value = 40.0 } | ||
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| testNullGeometryProcessing( | ||
| "Calling ST_SimplifyPreserveTopology on a NULL input" | ||
| ) | ||
| } | ||
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| override val function = STSimplifyPreserveTopology().apply { | ||
| binaryInput = NullableVarBinaryHolder() | ||
| toleranceInput = Float8Holder() | ||
| binaryOutput = NullableVarBinaryHolder() | ||
| buffer = allocateBuffer() | ||
| } | ||
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| override val STSimplifyPreserveTopology.wkbInput: NullableVarBinaryHolder get() = function.binaryInput | ||
| override val STSimplifyPreserveTopology.wkbOutput: NullableVarBinaryHolder get() = function.binaryOutput | ||
| } |