MultiAttributeOperationCollector.java

/**
 * Copyright (c) 2009-2011 VMware, Inc. All Rights Reserved.
 *
 * 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.springsource.insight.plugin.jmx;

import javax.management.Attribute;
import javax.management.AttributeList;

import com.springsource.insight.collection.DefaultOperationCollector;
import com.springsource.insight.collection.OperationCollector;
import com.springsource.insight.intercept.operation.Operation;
import com.springsource.insight.intercept.operation.OperationList;
import com.springsource.insight.intercept.operation.OperationUtils;
import com.springsource.insight.util.ListUtil;
import com.springsource.insight.util.StringFormatterUtils;

/**
 * A special {@link OperationCollector} that handles an {@link AttributeList}
 * return value
 */
public class MultiAttributeOperationCollector extends DefaultOperationCollector {
    public MultiAttributeOperationCollector() {
        super();
    }

    @Override
    protected void processNormalExit(Operation op, Object returnValue) {
        if (returnValue instanceof AttributeList) {
            encodeManagedAttributes(op, (AttributeList) returnValue);
        }
    }

    static OperationList encodeManagedAttributes(Operation op, AttributeList attrList) {
        return encodeManagedAttributes(op.createList(JmxPluginRuntimeDescriptor.ATTR_LIST_PROP), attrList);
    }

    static OperationList encodeManagedAttributes(OperationList op, AttributeList attrList) {
        if (ListUtil.size(attrList) <= 0) {
            op.clear();
            return op;
        }

        for (Object a : attrList) {
            Attribute attr = (Attribute) a;
            OperationUtils.addNameValuePair(op, attr.getName(), StringFormatterUtils.formatObject(attr.getValue()));
        }

        return op;
    }
}