package com.github.dockerjava.jaxrs;

import java.util.List;

import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.GenericType;
import javax.ws.rs.core.MediaType;

import com.google.common.net.UrlEscapers;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.github.dockerjava.api.command.ListImagesCmd;
import com.github.dockerjava.api.model.Image;

import static com.google.common.net.UrlEscapers.urlPathSegmentEscaper;

public class ListImagesCmdExec extends AbstrDockerCmdExec<ListImagesCmd, List<Image>> implements ListImagesCmd.Exec {

	private static final Logger LOGGER = LoggerFactory.getLogger(ListImagesCmdExec.class);

	public ListImagesCmdExec(WebTarget baseResource) {
		super(baseResource);
	}

	@Override
	protected List<Image> execute(ListImagesCmd command) {
		WebTarget webResource = getBaseResource()
                .path("/images/json")
                .queryParam("filters", urlPathSegmentEscaper().escape(command.getFilters()))
                .queryParam("all", command.hasShowAllEnabled() ? "1" : "0");

		LOGGER.trace("GET: {}", webResource);

		List<Image> images = webResource.request()
				.accept(MediaType.APPLICATION_JSON)
				.get(new GenericType<List<Image>>() {
				});
		LOGGER.trace("Response: {}", images);

		return images;
	}

}

package com.github.dockerjava.jaxrs;

import java.util.List;

import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.GenericType;
import javax.ws.rs.core.MediaType;

import com.google.common.net.UrlEscapers;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.github.dockerjava.api.command.ListImagesCmd;
import com.github.dockerjava.api.model.Image;

import static com.google.common.net.UrlEscapers.urlPathSegmentEscaper;

public class ListImagesCmdExec extends
		AbstrDockerCmdExec<ListImagesCmd, List<Image>> implements
		ListImagesCmd.Exec {

	private static final Logger LOGGER = LoggerFactory
			.getLogger(ListImagesCmdExec.class);

	public ListImagesCmdExec(WebTarget baseResource) {
		super(baseResource);
	}

	@Override
	protected List<Image> execute(ListImagesCmd command) {
		WebTarget webResource = getBaseResource().path("/images/json")
				.queryParam("all", command.hasShowAllEnabled() ? "1" : "0");

		if (command.getFilters() != null)
			webResource = webResource.queryParam("filters",
					urlPathSegmentEscaper().escape(command.getFilters()));

		LOGGER.trace("GET: {}", webResource);

		List<Image> images = webResource.request()
				.accept(MediaType.APPLICATION_JSON)
				.get(new GenericType<List<Image>>() {
				});
		LOGGER.trace("Response: {}", images);

		return images;
	}

}

send 'filters' parameter only if needed