/*
* Copyright 2013 Cloudera 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 com.cloudera.cdk.morphline.stdlib;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;
import com.cloudera.cdk.morphline.api.Command;
import com.cloudera.cdk.morphline.api.CommandBuilder;
import com.cloudera.cdk.morphline.api.MorphlineContext;
import com.cloudera.cdk.morphline.api.Record;
import com.cloudera.cdk.morphline.base.AbstractCommand;
import com.cloudera.cdk.morphline.base.Configs;
import com.cloudera.cdk.morphline.base.FieldExpression;
import com.typesafe.config.Config;
/**
* Command that succeeds if all field values of the given named fields are equal to the the given
* values, and fails otherwise.
*/
public final class EqualsBuilder implements CommandBuilder {
@Override
public Collection<String> getNames() {
return Collections.singletonList("equals");
}
@Override
public Command build(Config config, Command parent, Command child, MorphlineContext context) {
return new Equals(this, config, parent, child, context);
}
///////////////////////////////////////////////////////////////////////////////
// Nested classes:
///////////////////////////////////////////////////////////////////////////////
private static final class Equals extends AbstractCommand {
private final Set<Map.Entry<String, Object>> entrySet;
private final String renderedConfig; // cached value
public Equals(CommandBuilder builder, Config config, Command parent, Command child, MorphlineContext context) {
super(builder, config, parent, child, context);
this.entrySet = new Configs().getEntrySet(config);
this.renderedConfig = config.root().render();
}
@Override
protected boolean doProcess(Record record) {
for (Map.Entry<String, Object> entry : entrySet) {
String fieldName = entry.getKey();
List values = record.get(fieldName);
Object entryValue = entry.getValue();
Collection results;
if (entryValue instanceof Collection) {
results = (Collection)entryValue;
} else {
results = new FieldExpression(entryValue.toString(), getConfig()).evaluate(record);
}
if (!values.equals(results)) {
if (LOG.isDebugEnabled()) {
LOG.debug("Equals command failed because {} does not match values: {} for command: {}",
new Object[]{results, values, renderedConfig});
}
return false;
}
}
return super.doProcess(record);
}
}
}