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AwsFrame.java
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AwsFrame.java
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/*
* Copyright (c) 2012-2023, jcabi.com
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met: 1) Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer. 2) Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution. 3) Neither the name of the jcabi.com nor
* the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
* NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jcabi.dynamo;
import com.amazonaws.services.dynamodbv2.model.Condition;
import com.jcabi.aspects.Immutable;
import com.jcabi.aspects.Loggable;
import java.io.IOException;
import java.util.AbstractCollection;
import java.util.Iterator;
import java.util.Map;
import lombok.EqualsAndHashCode;
import lombok.ToString;
/**
* Frame through AWS SDK.
*
* @since 0.1
*/
@Immutable
@Loggable(Loggable.DEBUG)
@ToString
@EqualsAndHashCode
(
callSuper = false,
of = { "credentials", "tbl", "name", "conditions", "valve" }
)
final class AwsFrame extends AbstractCollection<Item> implements Frame {
/**
* AWS credentials.
*/
private final transient Credentials credentials;
/**
* Table.
*/
private final transient AwsTable tbl;
/**
* Table name.
*/
private final transient String name;
/**
* Conditions.
*/
private final transient Conditions conditions;
/**
* Valve with items.
*/
private final transient Valve valve;
/**
* Public ctor.
* @param creds Credentials
* @param table Table
* @param label Table name
*/
AwsFrame(final Credentials creds, final AwsTable table,
final String label) {
this(creds, table, label, new Conditions(), new ScanValve());
}
/**
* Public ctor.
* @param creds Credentials
* @param table Table
* @param label Table name
* @param conds Conditions
* @param vlv Valve
* @checkstyle ParameterNumber (5 lines)
*/
AwsFrame(final Credentials creds, final AwsTable table,
final String label, final Conditions conds, final Valve vlv) {
super();
this.credentials = creds;
this.tbl = table;
this.name = label;
this.conditions = conds;
this.valve = vlv;
}
@Override
public boolean isEmpty() {
return !this.iterator().hasNext();
}
@Override
public Iterator<Item> iterator() {
try {
return new AwsIterator(
this.credentials,
this,
this.name,
this.conditions,
this.tbl.keys(),
this.valve
);
} catch (final IOException ex) {
throw new IllegalStateException(ex);
}
}
@Override
public int size() {
try {
return this.valve.count(
this.credentials, this.name, this.conditions
);
} catch (final IOException ex) {
throw new IllegalStateException(
String.format("Can't count items in \"%s\"", this.name),
ex
);
}
}
@Override
public Frame where(final String attr, final String value) {
return this.where(attr, Conditions.equalTo(value));
}
@Override
public Frame where(final String attr, final Condition condition) {
return new AwsFrame(
this.credentials,
this.tbl,
this.name,
this.conditions.with(attr, condition),
this.valve
);
}
@Override
public Frame where(final Map<String, Condition> conds) {
return new AwsFrame(
this.credentials,
this.tbl,
this.name,
this.conditions.with(conds),
this.valve
);
}
@Override
public Frame through(final Valve vlv) {
return new AwsFrame(
this.credentials,
this.tbl,
this.name,
this.conditions,
vlv
);
}
@Override
public Table table() {
return this.tbl;
}
}