org.datavec.api.transform.condition.BooleanCondition Maven / Gradle / Ivy
/*-
* * Copyright 2016 Skymind, Inc.
* *
* * 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 org.datavec.api.transform.condition;
import lombok.EqualsAndHashCode;
import org.datavec.api.transform.schema.Schema;
import org.datavec.api.writable.Writable;
import org.nd4j.shade.jackson.annotation.JsonProperty;
import java.util.List;
/**
* BooleanCondition: used for creating compound conditions,
* such as AND(ConditionA, ConditionB, ...)
* As a BooleanCondition is a condition,
* these can be chained together,
* like NOT(OR(AND(...),AND(...)))
*
* @author Alex Black
*/
@EqualsAndHashCode
public class BooleanCondition implements Condition {
/**
* The output column name
* after the operation has been applied
*
* @return the output column name
*/
@Override
public String outputColumnName() {
return conditions[0].outputColumnName();
}
/**
* The output column names
* This will often be the same as the input
*
* @return the output column names
*/
@Override
public String[] outputColumnNames() {
return conditions[0].outputColumnNames();
}
/**
* Returns column names
* this op is meant to run on
*
* @return
*/
@Override
public String[] columnNames() {
return conditions[0].columnNames();
}
/**
* Returns a singular column name
* this op is meant to run on
*
* @return
*/
@Override
public String columnName() {
return conditions[0].columnName();
}
public enum Type {
AND, OR, NOT, XOR
}
private final Type type;
private final Condition[] conditions;
public BooleanCondition(@JsonProperty("type") Type type, @JsonProperty("conditions") Condition... conditions) {
if (conditions == null || conditions.length < 1)
throw new IllegalArgumentException(
"Invalid input: conditions must be non-null and have at least 1 element");
switch (type) {
case NOT:
if (conditions.length != 1)
throw new IllegalArgumentException("Invalid input: NOT conditions must have exactly 1 element");
break;
case XOR:
if (conditions.length != 2)
throw new IllegalArgumentException("Invalid input: XOR conditions must have exactly 2 elements");
break;
}
this.type = type;
this.conditions = conditions;
}
@Override
public boolean condition(List list) {
switch (type) {
case AND:
for (Condition c : conditions) {
boolean thisCond = c.condition(list);
if (!thisCond)
return false; //Any false -> AND is false
}
return true;
case OR:
for (Condition c : conditions) {
boolean thisCond = c.condition(list);
if (thisCond)
return true; //Any true -> OR is true
}
return false;
case NOT:
return !conditions[0].condition(list);
case XOR:
return conditions[0].condition(list) ^ conditions[1].condition(list);
default:
throw new RuntimeException("Unknown condition type: " + type);
}
}
/**
* Condition on arbitrary input
*
* @param input the input to return
* the condition for
* @return true if the condition is met
* false otherwise
*/
@Override
public boolean condition(Object input) {
switch (type) {
case AND:
for (Condition c : conditions) {
boolean thisCond = c.condition(input);
if (!thisCond)
return false; //Any false -> AND is false
}
return true;
case OR:
for (Condition c : conditions) {
boolean thisCond = c.condition(input);
if (thisCond)
return true; //Any true -> OR is true
}
return false;
case NOT:
return !conditions[0].condition(input);
case XOR:
return conditions[0].condition(input) ^ conditions[1].condition(input);
default:
throw new RuntimeException("Unknown condition type: " + type);
}
}
@Override
public boolean conditionSequence(List> sequence) {
switch (type) {
case AND:
for (Condition c : conditions) {
boolean thisCond = c.conditionSequence(sequence);
if (!thisCond)
return false; //Any false -> AND is false
}
return true;
case OR:
for (Condition c : conditions) {
boolean thisCond = c.conditionSequence(sequence);
if (thisCond)
return true; //Any true -> OR is true
}
return false;
case NOT:
return !conditions[0].conditionSequence(sequence);
case XOR:
return conditions[0].conditionSequence(sequence) ^ conditions[1].conditionSequence(sequence);
default:
throw new RuntimeException("Unknown condition type: " + type);
}
}
/**
* Condition on arbitrary input
*
* @param sequence the sequence to
* do a condition on
* @return true if the condition for the sequence is met false otherwise
*/
@Override
public boolean conditionSequence(Object sequence) {
List seq = (List) sequence;
switch (type) {
case AND:
for (Condition c : conditions) {
boolean thisCond = c.conditionSequence(seq);
if (!thisCond)
return false; //Any false -> AND is false
}
return true;
case OR:
for (Condition c : conditions) {
boolean thisCond = c.conditionSequence(seq);
if (thisCond)
return true; //Any true -> OR is true
}
return false;
case NOT:
return !conditions[0].conditionSequence(sequence);
case XOR:
return conditions[0].conditionSequence(sequence) ^ conditions[1].conditionSequence(seq);
default:
throw new RuntimeException("Unknown condition type: " + type);
}
}
/**
* Get the output schema for this transformation, given an input schema
*
* @param inputSchema
*/
@Override
public Schema transform(Schema inputSchema) {
return inputSchema;
}
@Override
public void setInputSchema(Schema schema) {
for (Condition c : conditions) {
c.setInputSchema(schema);
}
}
@Override
public Schema getInputSchema() {
return conditions[0].getInputSchema();
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("BooleanCondition(").append(type);
for (Condition c : conditions) {
sb.append(",").append(c.toString());
}
sb.append(")");
return sb.toString();
}
/**
* And of all the given conditions
* @param conditions the conditions to and
* @return a joint and of all these conditions
*/
public static Condition AND(Condition... conditions) {
return new BooleanCondition(Type.AND, conditions);
}
/**
* Or of all the given conditions
* @param conditions the conditions to or
* @return a joint and of all these conditions
*/
public static Condition OR(Condition... conditions) {
return new BooleanCondition(Type.OR, conditions);
}
/**
* Not of the given condition
* @param condition the conditions to and
* @return a joint and of all these condition
*/
public static Condition NOT(Condition condition) {
return new BooleanCondition(Type.NOT, condition);
}
/**
* And of all the given conditions
* @param first the first condition
* @param second the second condition for xor
* @return the xor of these 2 conditions
*/
public static Condition XOR(Condition first, Condition second) {
return new BooleanCondition(Type.XOR, first, second);
}
}
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