import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

public class DefaultIvyExtraInfo implements IvyExtraInfo {
    protected final Map<NamespaceId, String> extraInfo;

    public DefaultIvyExtraInfo() {
        this.extraInfo = new LinkedHashMap<>();
    }

    public DefaultIvyExtraInfo(Map<NamespaceId, String> extraInfo) {
        this.extraInfo = extraInfo;
    }

    @Override

        given:
        def extraInfo = new DefaultIvyExtraInfo([ (new NamespaceId('http://my.extra.info', 'foo')): 'fooValue' ])

        expect:
        extraInfo.get('foo') == 'fooValue'
        extraInfo.get('goo') == null
    }

    def "throws exception when name matches multiple keys" () {
        given:
        def extraInfo = new DefaultIvyExtraInfo([

package org.gradle.api.publish.ivy.internal.publication;

import org.gradle.api.internal.artifacts.ivyservice.DefaultIvyExtraInfo;
import org.gradle.api.internal.artifacts.ivyservice.NamespaceId;
import org.gradle.api.publish.ivy.IvyExtraInfoSpec;
import org.gradle.internal.xml.XmlValidation;

public class DefaultIvyExtraInfoSpec extends DefaultIvyExtraInfo implements IvyExtraInfoSpec {
    public DefaultIvyExtraInfoSpec() {
        super();
    }

    private final IvyExtraInfo extraInfo;

    public DefaultIvyModuleDescriptor(Map<NamespaceId, String> extraInfo, @Nullable String branch, String ivyStatus) {
        this.extraInfo = new DefaultIvyExtraInfo(extraInfo);
        this.branch = branch;
        this.ivyStatus = ivyStatus;
    }

    @Override
    public String getBranch() {
        return branch;
    }

    @Override