Add more findings related classes

Signed-off-by: Annie Lee <[email protected]>

alerting/src/main/kotlin/org/opensearch/alerting/action/GetFindingsSearchAction.kt

@@ -0,0 +1,15 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package org.opensearch.alerting.action
+
+import org.opensearch.action.ActionType
+
+class GetFindingsSearchAction private constructor() : ActionType<GetFindingsSearchResponse>(NAME, ::GetFindingsSearchResponse) {
+    companion object {
+        val INSTANCE = GetFindingsSearchAction()
+        val NAME = "cluster:admin/opendistro/alerting/findings/get"
+    }
+}

alerting/src/main/kotlin/org/opensearch/alerting/action/GetFindingsSearchRequest.kt

@@ -0,0 +1,57 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package org.opensearch.alerting.action
+
+import org.opensearch.action.ActionRequest
+import org.opensearch.action.ActionRequestValidationException
+import org.opensearch.alerting.model.Table
+import org.opensearch.common.io.stream.StreamInput
+import org.opensearch.common.io.stream.StreamOutput
+import org.opensearch.search.fetch.subphase.FetchSourceContext
+import java.io.IOException
+
+class GetFindingsSearchRequest : ActionRequest {
+    val findingsId: String?
+    val version: Long
+    val srcContext: FetchSourceContext?
+    val table: Table
+
+    constructor(
+        findingsId: String?,
+        version: Long,
+        srcContext: FetchSourceContext?,
+        table: Table,
+        destinationType: String
+    ) : super() {
+        this.findingsId = findingsId
+        this.version = version
+        this.srcContext = srcContext
+        this.table = table
+    }
+
+    @Throws(IOException::class)
+    constructor(sin: StreamInput) : this(
+        findingsId = sin.readOptionalString(),
+        version = sin.readLong(),
+        srcContext = if (sin.readBoolean()) {
+            FetchSourceContext(sin)
+        } else null,
+        table = Table.readFrom(sin)
+    )
+
+    override fun validate(): ActionRequestValidationException? {
+        return null
+    }
+
+    @Throws(IOException::class)
+    override fun writeTo(out: StreamOutput) {
+        out.writeOptionalString(findingsId)
+        out.writeLong(version)
+        out.writeBoolean(srcContext != null)
+        srcContext?.writeTo(out)
+        table.writeTo(out)
+    }
+}

alerting/src/main/kotlin/org/opensearch/alerting/action/GetFindingsSearchResponse.kt

@@ -0,0 +1,63 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package org.opensearch.alerting.action
+
+import org.opensearch.action.ActionResponse
+import org.opensearch.alerting.model.Finding
+import org.opensearch.common.io.stream.StreamInput
+import org.opensearch.common.io.stream.StreamOutput
+import org.opensearch.common.xcontent.ToXContent
+import org.opensearch.common.xcontent.ToXContentObject
+import org.opensearch.common.xcontent.XContentBuilder
+import org.opensearch.rest.RestStatus
+import java.io.IOException
+
+class GetFindingsSearchResponse : ActionResponse, ToXContentObject {
+    var status: RestStatus
+    var totalFindings: Int?
+    var findings: List<Finding>
+
+    constructor(
+            status: RestStatus,
+            totalFindings: Int?,
+            findings: List<Destination>
+    ) : super() {
+        this.status = status
+        this.totalFindings = totalFindings
+        this.findings = findings
+    }
+
+    @Throws(IOException::class)
+    constructor(sin: StreamInput) {
+        this.status = sin.readEnum(RestStatus::class.java)
+        val findings = mutableListOf<Destination>()
+        this.totalFindings = sin.readOptionalInt()
+        var currentSize = sin.readInt()
+        for (i in 0 until currentSize) {
+            findings.add(Destination.readFrom(sin))
+        }
+        this.findings = findings
+    }
+
+    @Throws(IOException::class)
+    override fun writeTo(out: StreamOutput) {
+        out.writeEnum(status)
+        out.writeOptionalInt(totalFindings)
+        out.writeInt(findings.size)
+        for (finding in findings) {
+            finding.writeTo(out)
+        }
+    }
+
+    @Throws(IOException::class)
+    override fun toXContent(builder: XContentBuilder, params: ToXContent.Params): XContentBuilder {
+        builder.startObject()
+                .field("totalFindings", totalFindings)
+                .field("findings", findings)
+
+        return builder.endObject()
+    }
+}