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/*
* 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.flink.api.java.utils;
import org.apache.flink.annotation.Public;
import org.apache.flink.annotation.PublicEvolving;
import org.apache.flink.api.common.ExecutionConfig;
import java.io.Serializable;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
/**
* This class provides common utility methods of {@link ParameterTool} and {@link MultipleParameterTool}.
*/
@Public
public abstract class AbstractParameterTool extends ExecutionConfig.GlobalJobParameters implements Serializable, Cloneable {
private static final long serialVersionUID = 1L;
protected static final String NO_VALUE_KEY = "__NO_VALUE_KEY";
protected static final String DEFAULT_UNDEFINED = "";
// ------------------ ParameterUtil ------------------------
// data which is only used on the client and does not need to be transmitted
protected transient Map defaultData;
protected transient Set unrequestedParameters;
/**
* Returns the set of parameter names which have not been requested with
* {@link #has(String)} or one of the {@code get} methods. Access to the
* map returned by {@link #toMap()} is not tracked.
*/
@PublicEvolving
public Set getUnrequestedParameters() {
return Collections.unmodifiableSet(unrequestedParameters);
}
// ------------------ Get data from the util ----------------
/**
* Returns number of parameters in {@link AbstractParameterTool}.
*/
protected abstract int getNumberOfParameters();
/**
* Returns the String value for the given key.
* If the key does not exist it will return null.
*/
protected abstract String get(String key);
/**
* Check if value is set.
*/
public abstract boolean has(String value);
/**
* Returns the String value for the given key.
* If the key does not exist it will throw a {@link RuntimeException}.
*/
public String getRequired(String key) {
addToDefaults(key, null);
String value = get(key);
if (value == null) {
throw new RuntimeException("No data for required key '" + key + "'");
}
return value;
}
/**
* Returns the String value for the given key.
* If the key does not exist it will return the given default value.
*/
public String get(String key, String defaultValue) {
addToDefaults(key, defaultValue);
String value = get(key);
if (value == null) {
return defaultValue;
} else {
return value;
}
}
// -------------- Integer
/**
* Returns the Integer value for the given key.
* The method fails if the key does not exist or the value is not an Integer.
*/
public int getInt(String key) {
addToDefaults(key, null);
String value = getRequired(key);
return Integer.parseInt(value);
}
/**
* Returns the Integer value for the given key. If the key does not exists it will return the default value given.
* The method fails if the value is not an Integer.
*/
public int getInt(String key, int defaultValue) {
addToDefaults(key, Integer.toString(defaultValue));
String value = get(key);
if (value == null) {
return defaultValue;
}
return Integer.parseInt(value);
}
// -------------- LONG
/**
* Returns the Long value for the given key.
* The method fails if the key does not exist.
*/
public long getLong(String key) {
addToDefaults(key, null);
String value = getRequired(key);
return Long.parseLong(value);
}
/**
* Returns the Long value for the given key. If the key does not exists it will return the default value given.
* The method fails if the value is not a Long.
*/
public long getLong(String key, long defaultValue) {
addToDefaults(key, Long.toString(defaultValue));
String value = get(key);
if (value == null) {
return defaultValue;
}
return Long.parseLong(value);
}
// -------------- FLOAT
/**
* Returns the Float value for the given key.
* The method fails if the key does not exist.
*/
public float getFloat(String key) {
addToDefaults(key, null);
String value = getRequired(key);
return Float.valueOf(value);
}
/**
* Returns the Float value for the given key. If the key does not exists it will return the default value given.
* The method fails if the value is not a Float.
*/
public float getFloat(String key, float defaultValue) {
addToDefaults(key, Float.toString(defaultValue));
String value = get(key);
if (value == null) {
return defaultValue;
} else {
return Float.valueOf(value);
}
}
// -------------- DOUBLE
/**
* Returns the Double value for the given key.
* The method fails if the key does not exist.
*/
public double getDouble(String key) {
addToDefaults(key, null);
String value = getRequired(key);
return Double.valueOf(value);
}
/**
* Returns the Double value for the given key. If the key does not exists it will return the default value given.
* The method fails if the value is not a Double.
*/
public double getDouble(String key, double defaultValue) {
addToDefaults(key, Double.toString(defaultValue));
String value = get(key);
if (value == null) {
return defaultValue;
} else {
return Double.valueOf(value);
}
}
// -------------- BOOLEAN
/**
* Returns the Boolean value for the given key.
* The method fails if the key does not exist.
*/
public boolean getBoolean(String key) {
addToDefaults(key, null);
String value = getRequired(key);
return Boolean.valueOf(value);
}
/**
* Returns the Boolean value for the given key. If the key does not exists it will return the default value given.
* The method returns whether the string of the value is "true" ignoring cases.
*/
public boolean getBoolean(String key, boolean defaultValue) {
addToDefaults(key, Boolean.toString(defaultValue));
String value = get(key);
if (value == null) {
return defaultValue;
} else {
return Boolean.valueOf(value);
}
}
// -------------- SHORT
/**
* Returns the Short value for the given key.
* The method fails if the key does not exist.
*/
public short getShort(String key) {
addToDefaults(key, null);
String value = getRequired(key);
return Short.valueOf(value);
}
/**
* Returns the Short value for the given key. If the key does not exists it will return the default value given.
* The method fails if the value is not a Short.
*/
public short getShort(String key, short defaultValue) {
addToDefaults(key, Short.toString(defaultValue));
String value = get(key);
if (value == null) {
return defaultValue;
} else {
return Short.valueOf(value);
}
}
// -------------- BYTE
/**
* Returns the Byte value for the given key.
* The method fails if the key does not exist.
*/
public byte getByte(String key) {
addToDefaults(key, null);
String value = getRequired(key);
return Byte.valueOf(value);
}
/**
* Returns the Byte value for the given key. If the key does not exists it will return the default value given.
* The method fails if the value is not a Byte.
*/
public byte getByte(String key, byte defaultValue) {
addToDefaults(key, Byte.toString(defaultValue));
String value = get(key);
if (value == null) {
return defaultValue;
} else {
return Byte.valueOf(value);
}
}
// --------------- Internals
protected void addToDefaults(String key, String value) {
final String currentValue = defaultData.get(key);
if (currentValue == null) {
if (value == null) {
value = DEFAULT_UNDEFINED;
}
defaultData.put(key, value);
} else {
// there is already an entry for this key. Check if the value is the undefined
if (currentValue.equals(DEFAULT_UNDEFINED) && value != null) {
// update key with better default value
defaultData.put(key, value);
}
}
}
// ------------------------- Export to different targets -------------------------
@Override
protected abstract Object clone() throws CloneNotSupportedException;
// ------------------------- ExecutionConfig.UserConfig interface -------------------------
@Override
public abstract Map toMap();
}
